MONO PURE CLASS A VALVE POWER AMPLIFIER

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Total solder points: 600
Difficulty level:
beginner 1† 2† 3† 4† 5; advanced
MONO PURE CLASS
POWER AMPLIFIER
HIGH-Q
A
VALVE
K8010
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
⇒
Pure CLASS A valve sound with high quality KT88 valves
High quality chrome plated enclosure
Chrome plated valve socket covers
Easy bias adjustment with LED indication
Removable bottom for easy access and service
High quality capacitors and components
Gold plated input and speaker terminals
Standby function
Soft start circuit for power transformer
Sensitivity adjustment for exact matching of two mono amps
Specifications
•
•
•
•
•
•
•
•
•
Full class A 65Wrms in 4 or 8Ω
Bandwidth: 4Hz to 90KHz (-3dB/1W)
Harmonic distortion: 0.1% @ 1W/1KHz
Signal to noise ratio: >110dB (A weighted)
Input sensitivity: 1Vrms (adjustable)
Power supply: 100, 120, 230 or 245VAC
Power consumption: 230VA max.
Dimensions: 355W x 360D x 157H
Weight: 14Kg / 31lb
modifications reserved
MANUAL
H8010P-ED1
5%
1%
4K7= ( 4 - 7 - 2 - B )
I
P
C CODICE CODIGO
DE
O COLORE
CORES
D
E
0
1
2
3
4
5
6
7
8
9
A
B
Nero
Marrone
Rosso
Aranciato
Giallo
Verde
Blu
Viola
Grigio
Bianco
Argento
Oro
Preto
Castanho
Encarnado
Laranja
Amarelo
Verde
Azul
Violeta
Cinzento
Branco
Prateado
Dourado
COLOR= 2… 5
4K7= ( 4 - 7 - 0 - 1 - 1 )
E
CODIGO
DE COLORES
Negro
Marrón
Rojo
Naranjado
Amarillo
Verde
Azul
Morado
Gris
Blanco
Plata
Oro
SF
VÄRI
KOODI
Musta
Ruskea
Punainen
Oranssi
Keltainen
Vihreä
Sininen
Purppura
Harmaa
Valkoinen
Hopea
Kulta
S
DK
N
FÄRG FARVE FARGE
SCHEMA KODE KODE
Svart
Brun
Röd
Orange
Gul
Grön
Blå
Lila
Grå
Vit
Silver
Guld
Sort
Brun
Rød
Orange
Gul
Grøn
Blå
Violet
Grå
Hvid
Sølv
Guld
Sort
Brun
Rød
Orange
Gul
Grønn
Blå
Violet
Grå
Hvidt
Sølv
Guldl
D
FARB
KODE
Schwarz
Braun
Rot
Orange
Gelb
Grün
Blau
Violet
Grau
Weiss
Silber
Gold
GB
F
COLOUR CODIFI-
CODE
CATION
DES
COULEURS
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Grey
White
Silver
Gold
Noir
Brun
Rouge
Orange
Jaune
Vert
Blue
Violet
Gris
Blanc
Argent
Or
NL
KLEUR
KODE
C
O
D
E
Zwart
Bruin
Rood
Oranje
Geel
Groen
Blauw
Paars
Grijs
Wit
Zilver
Goud
0
1
2
3
4
5
6
7
8
9
A
B
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TECHNICAL DAT A*
•
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•
•
•
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Output power: 65 Wrms class A / 85Wrms maximum
Output impedance 4 or 8 Ohm
Ultra linear output transformer
Switch-on delay, to protect the output tubes: approx. 1 minute
Standby circuit
Built-in bias current indicator
Switch-on delay for the supply transformer : 0.5s
Power bandwidth: 8Hz - 45kHz (-3dB, ref. 50W)
Frequency range: 4Hz - 90kHz (-3dB, ref. 1W)
Harmonic distortion:
0.1% (1 kHz/1W)
0.7% (1 kHz/65W)
Signal/noise ratio: > 110dB (A weighted wrt 85W)
Input impedance: 100Kohm
Input sensitivity min 1Vrms, adjustable.
Damping factor (100Hz): > 12
Power supply: 100, 120, 230, 245VAC
Power consumption: 230Wmax. / 66W standby
Dimensions: 355W x 360D x 157H
*Modifications and typographical errors reserved
3
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1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project successful.
Read them carefully.
1.1 Make sure you hav e the right tools:
• A good quality soldering iron (25-40W) with a small tip.
• Wipe it often on a wet sponge or cloth, to keep it clean;
then apply solder to the tip, to give it a wet look. This is
called ‘thinning’ and will protect the tip, and enables you
to make good connections. When solder rolls off the tip, it needs cleaning.
• Thin raisin-core solder. Do not use any flux or grease.
• A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold
the lead so they cannot fly towards the eyes.
• Needle nose pliers, for bending leads, or to hold components in place.
• Small blade and phillips screwdrivers. A basic
range is fine.
For this projects, a basic multi-meter is required
0.0
0
0
1.2 Assembly Hints :
; Make sure the skill level matches your experience, to avoid disappointments.
; Follow the instructions carefully. Read and understand the entire step before you perform each operation.
; Perform the assembly in the correct order as stated in this manual
; Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
; Values on the circuit diagram are subject to changes.
; Values in this assembly guide are correct*
; Use the check-boxes to mark your progress.
; Please read the included information on safety and customer service
* Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated
as ‘NOTE’ on a separate leaflet.
1.3 Soldering Hints :
Mount the component against Make sure the solder joints are
the PCB surface and carefully cone-shaped and shiny
solder the leads
4
Trim excess leads as close as
possible to the solder joint
__________________________________________________________________________________________________________________________________________________________
ASSEMBLY OF THE MAIN PCB P8010:
Foreword:
For best results and easy handling of the large PCB (Printed Circuit Board), we will start by putting the four
large valve sockets in place. This will allow us to rest the board on the bench, without having the component leads touching the bench surface.
When the component leads are put in the appropriate holes on the PCB, we recommend to gently bend the
leads outwards, so they stay on the board when it is flipped over to apply solder. You gain a reasonable
amount of time if you put approx. 10 components in place every time, before you flip the board, and make
the solder joints.
5
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1. VALVE SOCKET MOUNTING
Check the position of the notch in the centre of the valve socket, it must correspond to the position of the
notch in the circle printed on the PCB. Connect the leads to the corresponding isles on the PCB using a
small piece of supplied jumper wire.
IMPORTANT:
Make the connection exactly as shown in the illustration, otherwise the small piece of wire could touch the
bottom of the cabinet, see further.
Also mount a 15 mm spacer on the following holes in
the PCB (at the solder side); use a 6 mm M3 bolt:
‰
‰
‰
‰
‰
3
V...
1
4
5
8
2
7
A spacer next to TRAFO1
A spacer next to SK15
A spacer next to SK6
A spacer next to R62
A spacer next to V6
6mm M3 BOLT
20mm M3 BOLT
VALVE SOCKET
15mm M3 SPACER
12mm SPACER
PCB
15mm M3 SPACER
5
6
8
7
5
8
4
3
4
1
2
1
3
‰
‰
‰
‰
6
V1
V2
V3
V4
Connect the valve socket terminals 1, 3, 4, 5, and 8 to the corresponding
points at the solder side of the PCB.
Use a piece of supplied jumperwire. Mount the wire in such way that it cannot
touch the bottom of the cabinet. (see above illustration).
__________________________________________________________________________________________________________________________________________________________
2. JUMPERS
Note that for J1 to J4, two jumper wires have to
be mounted in the same hole, for extra current
handling.
TIP
In order to get nice straight wiring, without too
much folding and measuring, follow these
hints:
• Put the jumper wire in place.
• Solder one end of the lead.
• Then carefully pull on the free end of the lead
until it is straight, and apply solder.
N
ld th th
d
3. JUMPERS FOR AC POWER SELECTION
For 100V input (mains), mount:
‰ JA at the voltage selection 1
D
C
B
A
‰
JA at the voltage selection 2
D
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J1 (mount 2 wires in the same hole)
J2 (mount 2 wires in the same hole)
J3 (mount 2 wires in the same hole)
J4 (mount 2 wires in the same hole)
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
J16
J17
J18
J19
J20
J21
J22 indicated with ‘F1’
(mount 2 wires in the same hole)
C
B
A
For 115V - 120V input, mount:
‰ JB at the voltage selection 1
D
C
B
A
‰
JB at the voltage selection 2
D
C
B
A
7
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4. DIODES (Check the polarity!)
For 220V - 230V input, mount:
‰ JC at the voltage selection 1
D
C
D...
CATHODE
B
A
‰
JC at the voltage selection 2
D
C
B
A
For 240V -245V mains input, mount:
‰ JD at the voltage selection 1
D
C
B
A
‰
JD at the voltage selection 2
D
C
B
A
REMARK:
Strike out the NOT used mains voltage indication at the back of the enclosure !! Use a permanent black marker
8
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D1: 1N4148
D2 :1N4148
D3: 1N4007
D4: 1N4148
D5: 1N4007
D6: 1N4148
D7: 1N4148
D8: 1N4148
D9: 1N4007
D10: 1N4007
D11: 1N4007
D12: 1N4007
D13: 1N4007
D14: 1N4007
D15: 1N4007
D16: 1N4007
D17: 1N4007
D18: 1N4007
D19: 1N4007
D20: 1N4007
D21: 1N4007
D22: 1N4007
D23: 1N4007
D24: 1N4148
D25: 1N4148
D26: 1N4148
D27: 1N5408
D28: 1N5408
D29: 1N5408
D30: 1N5408
not on
not on
not on
not on
tape !
tape !
tape !
tape !
__________________________________________________________________________________________________________________________________________________________
5. ZENER DIODES
(Check the polarity!)
ZD...
CATHODE
‰
‰
ZD1: 3V9
ZD2: 3V9
6. ¼W & ½W RESISTORS
R...
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R1: 470 (4 - 7 - 1 - B)
R2: 220K (2 - 2 - 4 - B)
R3: 2K2 (2 - 2 - 2 - B)
R4: 2K2 (2 - 2 - 2 - B)
R5: 220K (2 - 2 - 4 - B)
R6: 100K (1 - 0 - 4 - B)
R7: 1K (1 - 0 - 2 - B)
R8: 1K (1 - 0 - 2 - B)
R9: 22K (2 - 2 - 3 - B)
R10: 3.3 (3 - 3 - B - B - 9)
R11: 3K9 (3 - 9 - 2 - B)
R12: 1K5 (1 - 5 - 2 - B)
R13: 1M (1 - 0 - 5 - B)
R14: 1M (1 - 0 - 5 - B)
R15: 1K (1 - 0 - 2 - B)
R16: 47K (4 - 7 - 3 - B)
R17: 470K (4 - 7 - 4 - B)
R18: 680 (6 - 8 - 1 - B)
R19: 3K9 (3 - 9 - 2 - B)
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R20: 10K (1 - 0 - 3 - B)
R21: 10K (1 - 0 - 3 - B)
R22: 1K5 (1 - 5 - 2 - B)
R23: 1K2 (1 - 2 - 2 - B)
R24: 560 (5 - 6 - 1 - B)
R25: 100K (1 - 0 - 4 - B)
R26: 220K (2 - 2 - 4 - B)
R27: 100K (1 - 0 - 4 - B)
R28: 220K (2 - 2 - 4 - B)
R29: 10K (1 - 0 - 3 - B)
R30: 2K7 (2 - 7 - 2 - B)
R31: 1M5 (1 - 5 - 5 - B)
R32: 1K5 (1 - 5 - 2 - B)
R33: 3.3 (3 - 3 - B - B)
R34: 8K2 (8 - 2 - 2 - B)
R35: 220K (2 - 2 - 4 - B)
R36: 10K (1 - 0 - 3 - B)
R37: 100K (1 - 0 - 4 - B)
R38: 220K (2 - 2 - 4 - B)
R39: 100K (1 - 0 - 4 - B)
R40: 220 (2 - 2 - 1 - B - 9)
R41: 100K (1 - 0 - 4 - B - 9)
R42: 47K (4 - 7 - 3 - B - 9)
R43: 220 (2 - 2 - 1 - B - 9)
R44: 220 (2 - 2 - 1 - B - 9)
R45: 220 (2 - 2 - 1 - B - 9)
R46: 2K2 (2 - 2 - 2 - B - 9)
R47: 27K (2 - 7 - 3 - B - 9)
R48: 220 (2 - 2 - 1 - B - 9)
R49: 220 (2 - 2 - 1 - B - 9)
R50: 100K (1 - 0 - 4 - B - 9)
R51: 330K (3 - 3 - 4 - B - 9)
R52: 330K (3 - 3 - 4 - B - 9)
R53: 330K (3 - 3 - 4 - B - 9)
R54: 330K (3 - 3 - 4 - B - 9)
9
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7. 1W RESISTORS
8. LEDs (Check the polarity!)
R...
COLOR = 2...5
LD...
2mm
CATHODE
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R55: 270 (2 - 7 - 1 - B)
R56: 10K (1 - 0 - 3 - B)
R57: 10K (1 - 0 - 3 - B)
R58: 12K (1 - 2 - 3 - B)
R59: 39K (3 - 9 - 3 - B)
R60: 39K (3 - 9 - 3 - B)
R61: 39K (3 - 9 - 3 - B)
R62: 100K (1 - 0 - 4 - B)
R63: 47K (4 - 7 - 3 - B)
R64: 47K (4 - 7 - 3 - B)
R65: 47 (4 - 7 - 0 - B)
R66: 47 (4 - 7 - 0 - B)
R67: 180 (1 - 8 - 1 - B)
R68: 180 (1 - 8 - 1 - B)
R69: 180 (1 - 8 - 1 - B)
R70: 47 (4 - 7 - 0 - B)
R71: 47 (4 - 7 - 0 - B)
R72: 180 (1 - 8 - 1 - B)
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LD1: 5mm RED (2) BLINKING
LD2: WILL BE MOUNTED
LATER, SEE SECTION 27
LD3: 3mm YEL (4)
LD4: 3mm YEL (4)
LD5: 3mm YEL (4)
LD6: 3mm YEL (4)
LD7: 3mm GREEN (5)
LD8: 3mm GREEN (5)
LD9: 3mm RED (2)
LD10: 3mm RED (2)
LD11: 3mm RED (2)
LD12: 3mm RED (2)
LD13: 3mm RED (2) (next to R61)
9. IC SOCKETS
(Check the position of the notch!)
1
IC...
‰
10
IC1: 18P
__________________________________________________________________________________________________________________________________________________________
10. REED RELAYS
(Check the position of the notch!)
12. RESISTOR TRIMMERS
Vertical type
1
PIN 1
RV...
RY...
‰
RY1: VR05R121
‰
‰
‰
‰
11. DIP SWITCHES
RV1: 100K
RV2: 100K
RV3: 100K
RV4: 100K
Horizontal type
SW...
1
RV...
Check that switch 1 corresponds to pin 1.
‰
SW2: DS-4P
‰
RV5: 500K (470K)
11
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13. TRANSISTORS
15. PCB BLADE TERMINALS
T...
Mount them as straight AS possible against the
PCB. A good solder joint is very important !
T...
SK...
T...
T...
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‰
‰
T1: BC516
T2: BC547C
T3: BC547C
T4: BC547C
14. 5W RESISTORS
R...
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SK1: 4 Ohm
SK2: GND
SK3: 8 Ohm
SK4: BLUE
SK5: RED
SK6: YELLOW
SK7: GRAY
SK8: GRAY
SK9: GREEN
SK10: GREEN
SK21: EARTH
SK22: EARTH
16. CINCH / RCA CONNECTOR
2mm
Mount it as straight and square as possible
against the PCB.
REMARK: You will have one 15 Ohm 5W resistors left over for later use.
‰
‰
‰
R73: 15
R74: 15
R75: 15
‰
12
SK11: CINFP/90
__________________________________________________________________________________________________________________________________________________________
17. PCB TERMINAL BLOCK
19. SWITCH
some blocks slide into each other !
SW...
IMPORTANT:
Don't leave a gap between
the SWITCH and the PCB!
Mount these terminals with the wire inputs facing
the PCB edge:
‰
SK12: 2 POLE (large)
‰
‰
‰
SK13: 3 POLE
SK14: 3 POLE
SK15: 3 POLE
‰
‰
SK16: 3 POLE
SK17: 3 POLE
SIDE VIEW
Mount it as square as possible against the PCB,
Also solder the metal support.
‰ SW1: 3P ON-ON-ON
SK18 to SK20 are not mounted
20. CAPACITORS
18. VALVE SOCKET
C...
1
6
V...
2
7
3
8
5
Mount them straight against the PCB
‰
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V5: B9A
V6: B9A
9
4
Check the voltage rating!
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C1: 47nF (473, 0.047, 47000)
C2: 100pF (101)
C3: 330pF/400V (331)
C4: 330pF/400V (331)
C5: 68n/630V (683, 0.068)
C6: 68n/630V (683, 0.068)
C7: 68n/630V (683, 0.068)
C8: 68n/630V (683, 0.068)
C9: 68n/630V (683, 0.068)
C10: 68n/630V (683, 0.068)
C11: 680n/160V (684, 0.68)
C12: 680n/160V (684, 0.68)
C13: 680n/160V (684, 0.68)
13
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21. POWER RELAYS
The various relays have footprints that correspond to the footprints on the PCB:
‰
‰
22. ELECTROLYTIC CAPACITOR
(Check the polarity!)
RY2: VR10V121C
RY3: VR10V121C
C...
RY...
‰
RY4: VR5V122C
RY...
14
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C14: 4µ7
C15: 100µF
C16: 470µF
C17: 470µF
C18: 470µF
C19: 470µF
C20: 47µF/100V
C21: 100µF/100V
C22: 1000µF
C23: 4700µF
C24: 47µF/350V
C25: 47µF/350V
C26: 100µF
C27: 1µF
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23. TRANSFORMER
25. INSERT THE IC
(Check the position of the notch!)
1
PIN 1
IC...
TRAFO...
‰
‰
IC1: LM3914
TRAFO1: 12VAC
24. ELECTROLYTIC CAPACITOR
(Check the polarity!)
Generally these capacitors are of the snap-in type
and cannot be mounted incorrectly.
C...
‰
‰
‰
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C28: 100u/400V
C29: 220u/450V
C30: 220u/450V
C31: 220u/450V
15
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26. 6.3V VALVE WIRING
‰
Wiring for the 4 valve sockets V1 to V4. Use the supplied brown wire. Twist them as shown in the
illustration. The polarity is not important. For safety, it is advisable to check with an ohmmeter that
the two 6.3V terminals are not shorted when the wiring is completed.
6.3VAC
f6
f8 f7
f5
f4
f3
6.3VAC
f2
f1
3
5
7
6
8
5
1
8
4
2
3
1
8
1
4
4
5
3
4
1
2
8
V4
3
7
6
5
V1
V3
5
6
V2
7
8
5
1
3
1
8
8
4
3
2
1
4
4
5
4
3
3
2
1
8
7
6
5
VIEWED FROM SOLDERSIDE
27. SPECIAL LED (Check the polarity!)
‰ LD2: 3mm bicolor:
Carefully check the mounting of this LED:
3
1
2
1
3
5mm
LD2 ONLY !
2
LD...
5mm
Check the complete assembly again for errors. Pay special attention to bad solder
joints, shorts and wrongly inserted or misplaced components !
16
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ASSEMBLY INTO THE CABINET:
• Mount the caged nuts into the square holes as shown in the illustration. These nuts are later used to
fasten the covers.
CLICK INTO HOLE
FIG 1
• Mount the chromed feet on the four cabinet corners, with an M4 bolt. To avoid scratches on other
equipment, you can stick a piece of felt on every foot (not supplied).
• Mount a shakeproof washer and a 15mm threaded spacer on the front and back studding as shown in
the illustration.
15mm M3 SPACER
M3 LOCK WASHER
M3 BOLT
FIG 2
• Position the PCB in the cabinet, and fasten at the bottom with the supplied black button head hexagon
socket screws (Use the supplied Allen key). At the component side of the PCB, two M3 bolts fasten the
PCB on the threaded spacers we mounted in the previous step.
• The mains inlet located at the back of the enclosure will be flush mounted as shown in the illustration.
Use two black button head hexagon socket screws , together with a shakeproof washer and an M3 nut.
M3 BOLT
MAINS INLET
M3 LOCK W ASHER
M3 NUT
FIG 3
17
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• Make the connections as shown. Use the supplied blue wire for the neutral (N) terminal, and brown wire
for the live (L) terminal.
FIG 4
The earth terminal is hooked up with green/yellow striped wire.
green/yellow striped wire must be soldered for best results.
The female push-on connector on the
SOLDER
FIG 5
Connect the earth wire to SK21 on the PCB. Remove the fuse holder lid, and insert a miniature glass fuse.
For mains voltages of 100-125VAC, use the supplied 8A slow-blow fuse, while for 220-240VAC operation the 4A slow-blow fuse needs to be fitted. The spare fuse can also be stored in the fuse holder lid.
• Mounting of the speaker terminals: Mount them as shown in the diagram. Watch the position of the
plastic insulator rings : one is flat, while the other has an elevated ring on the inside. There is no need to
mount the solder lugs.
SPEAKER TERMINAL
INSULATOR RING
NUT
NUT
INSULATOR RING
FIG 6
HINT : For easy fastening of the speaker terminals, immobilise the terminal by inserting a screwdriver in the
wire hole, while fastening the nuts.
IMPORTANT : The speaker terminals must be electrically isolated from the metal enclosure. For safety,
check for infinite resistance between every terminal and the metal enclosure.
• Use the supplied 1,5mm² wire to make the connections. For best results, solder the female push-on
connector (fig 5). Apply enough heat, in order to make a good solder joint.
18
__________________________________________________________________________________________________________________________________________________________
FIG
7
• Mounting of the toroid transformers : The output transformer marked ZD043 must be fitted according to
the illustration, on the right hand side of the cabinet. Watch the location of the wires.
RUBBER WASHER
OUTPUT TRANSFORMER
RUBBER WASHER
M8 BOLT
STEEL DISHED WASHER
FIG 8
!
IMPORTANT : Do not trim the wires of the transformers, leave them at their original length. If there is
more than one conductor in an insulating sleeve, you have to make sure they are soldered together and
make a good electrical connection before they are connected to the terminal block.
19
_________________________________________________________________________________________________________________________________________________
______
• Connect the double yellow wire with the connector marked ‘YELLOW’ SK6.
Connect the red wire with the connector marked ‘RED’ SK5.
Connect the blue wire with the connector marked ‘BLUE’ SK4.
Use the supplied female push-on connectors (fig 5) and solder them onto the wires !
Connect the remaining wires to the terminal blocks SK16 and SK17. Pay attention to the colors.
FIG 9
• The supply transformer must be fitted according to the illustration, on the left hand side of the cabinet.
Watch the location of the wires. The sturdy grey and green wires, which supply the 6,3V filament voltage,
must sit on top.
RUB BER W ASHE R
PO W ER
TRA NSF O RME R
RUBB ER W ASHER
ST EEL DISHED W ASH ER
M8 BO LT
FIG 10
20
__________________________________________________________________________________________________________________________________________________________
• Connect the grey wires to the connectors marked SK7 and SK8 (GRAY). Connect the green wires to
the connectors marked SK9 and SK10 (GREEN).
Connect the remaining leads to the terminal blocks SK13, SK14 and SK15
FIG 11
FINAL INSPECTION :
!
WARNING : THE PCB CARRIES VOLTAGES THAT EXCEED 400V !
THESE VOLTAGES CAN KILL ! MAKE SURE NO ONE CAN TOUCH ANY LIVE PARTS
Use suitable isolated measuring equipment
• Put the mains switch into its fully OFF position (all the way down).
• Connect the unit to a wall outlet, by means of the supplied cord. In some countries, the supplied plug will
not fit the local wall outlets. If this is the case, cut the supplied plug, and replace it with a suitable
one (not included). Make sure to wire it correctly : blue : neutral (N), brown : live (L), yellow/green : earth.
If the mains voltage is present, LD2 should light continuously red.
• Turn the unit on by pushing the mains switch to its fully upward position.
LD2 should now blink for a while, this indicates the standby mode. After approximately one minute, LD2
should light continuously green, indicating ‘ON’, and a relay should click.
• Now check the following voltages with a multimeter:
Measure about 6.3VAC between SK7-SK8 and SK9-SK10
Measure about 6.3VAC between pins 2 and 7 of the tube sockets V1 to V4 (illustration)
FIG 12
21
_________________________________________________________________________________________________________________________________________________
______
!
SWITCH OFF THE UNIT AND REMOVE THE MAINS PLUG. WAIT A COUPLE OF MINUTES
UNTIL THE DANGEROUS HIGH VOLTAGE HAS DISSAPEARED
(UNTIL HIGH VOLTAGE INDICATOR LD13 TURNS OFF)
• Put the small valves in place:
V6 type ECC82 or 12AU7, CV491, 6189, 8136
V5 type ECC81 or 12AT7, CV455, 6201, 8162
• Reconnect the mains plug, and switch the unit ON again (switch in full upward position)
Wait until LD2 lights green continuously.
• Now check all indicated voltages on the PCB with respect to ground. A suitable ground for these measurements is J4, at the centre of the PCB. The point indicated VB2 should carry approx. 3.5VDC.
REMARK : All voltages may vary a bit, due to mains voltage fluctuations. At this stage, you cannot measure the 3.6VDC voltages yet.
CALIBRATION
Switch off the unit, disconnect the mains plug and wait until the high voltage has disappeared.
Turn the trim potentiometers RV1 to RV4 fully counter clockwise with a small screwdriver.
Put the four KT88 or equal tubes in their sockets. Watch the position of the notch.
IMPORTANT : The remaining 15 Ohm / 5W resistor must be hooked up between the centre and the 8 ohm
speaker terminal at the back of the unit. A valve amplifier must never be operated without a suitable load at
the speaker terminals. Make sure there is a good electrical connection between the terminals and the
resistor.
Bias current calibration
This calibration does not require a measuring instrument, as the bias level of each tube can be displayed on
the LED scale. The four dipswitches allow valve selection, while each valve has its own trim potentiometer.
RV1 controls V1, RV2 controls V2 etc…
IMPORTANT : This calibration determines the bias current trough the expensive output valves.
Therefore, it requires your absolute attention. Perform the calibration in the correct order.
No signal may be present at the input of the amplifier, during the calibration.
Flip all four DIP switches (SW2) to their OFF position
Every switch enables the bias readout of one valve, so do not switch on more than one at a time, or the
readout will be incorrect.
Reconnect the mains plug, and switch the unit ON again (switch in full upward position)
Wait until LD2 lights green continuously.
Put the first switch in the ON position (use a pen or a small screwdriver)
Gently turn RV1 clockwise until the second or third LED lights (LD4 or LD5)
Switch off the first switch.
Switch on the second switch
Gently turn RV2 clockwise until the second or third LED lights (LD4 or LD5)
Perform the same operation with RV3 and RV4
Wait for about 10 minutes, before continuing the rest of the calibration.
Repeat the calibration of RV1 to RV4, but this time the trim potentiometers must be turned clockwise until
one or two green LEDs light.
22
__________________________________________________________________________________________________________________________________________________________
When this operation is finished, check the 3.6V DC voltages at R65, R66, R70 and R71. Again, use J4 as
ground reference.
FINALLY !
It is time to listen to your amplifier !
Switch off the unit completely before connecting or disconnecting any cables.
Connect a 4 or 8 ohm speaker to the correct terminals at the back of the unit. Speakers with impedances
between 4 and 8 ohms can be connected to the 8 ohm terminal.
The common negative speaker terminal is located in between the 4 and 8 ohm positive terminals.
Hook up an audio source to the RCA connector at the back. Make sure the volume control of the source is
set to minimum before the unit is turned on.
The ‘SENSITIVITY’ trimmer located at the centre of the board allows you to trim the amplifiers input sensitivity, so two units put out exactly the same level, which improves the stereo image. Normally, this trimmer
should be set fully clockwise.
If necessary, feed a mono signal to both amplifiers, and trim both sensitivity trimmers, until the sound
comes from the exact centre between both loudspeakers.
• Valve amplifiers run hot ! Operate them in a well ventilated area ! Do not put them in a closed
rack, stack or cabinet.
• It is a good habit to check the bias current on a regular basis, especially when the valves are new.
• They need to run-in for a while, during which the bias level may shift.
• For short intervals between listening sessions, put the amplifier in stand-by mode (mains switch
in middle position).
FINISHING THE ENCLOSURE ASSEMBLY
• Check if none of the components on the PCB will touch the chromed cover plates, when they are put in
place.
• Turn the unit, so it rests on its left or right hand side.
• This allows you to fasten the bottom lid, by means of the supplied black button head hexagon socket
screws.
• Click the caged nuts into their holes on the chromed vertical plate (Be careful not to scratch the surface).
• Mount the chromed cover plate on the chromed vertical plate with two silver button head hexagon socket
screws. Tighten by hand.
• Position this assembly onto the enclosure, and put the silver button head hexagon socket screws in
place. Tighten them by hand. Connect the chromed vertical plate to SK22 (chassis earth) with a length
of yellow/green striped wire and 2 female push-on terminals. Make sure you solder both terminals. (See
fig 5)
• Mount the top cover on the enclosure (Make sure the earth lead of the vertical plate is bent down, so it
does not get squeezed between the lid and the enclosure). Use the supplied black button head hexagon
socket screws.
• Mount the front panel. Use the supplied right angle mounting brackets, together with the shakeproof
washers and the M3 and M4 bolts. Take care of the correct position of the mains switch and LD2.
• Make sure everything fits well, and tighten all screws.
!
THIS AMPLIFIER RUNS HOT , OPERATE IT OUT OF THE REACH OF CHILDREN !
CHECK YOUR MAINS VOLTAGE
MAKE SURE IT MATCHES THE SELECTED VOLTAGE
REMOVE T HE MAINS PLUG AND WAIT AT LEAST 15 MINUTES BEFORE REMOVING THE
COVERS
SOME PARTS MAY CARRY DANGEROUS VOLTAGES, EVEN WHEN THE UNIT IS UNPLUGGED
TROUBLESHOOTING
23
_________________________________________________________________________________________________________________________________________________
______
Hum coming from the speakers :
To make sure the amplifier is the source of hum, short the RCA input (by means of a spare male RCA plug,
which you short internally), and disconnect the earth connector SK21.
As a reference, listen at about 1m (3 ft) from the speaker, there should be an negligible amount of hum present.
If there’s still a reasonable amount of hum present, check the bias current of every valve. Also check the
electrical connection between the PCB ground and the enclosure, which is done trough the bolt next to R1.
A defective valve can also be a source of hum.
If hum is only present, when the amplifier is hooked up to an audio system, then a hum-loop could be the
cause. To verify if this is the case, disconnect SK21
Use good quality, as short as possible, interconnecting leads.
For best results, choose equal lengths for both left and right amplifier.
If the high tension is not present, check the transformer wiring and the mains fuse, located at the back of
the unit, below the mains inlet.
An intermitted crackling sound coming from the speakers could point to a defective resistor R62.
Replace it with the same value and power rating.
A continuous buzzing sound coming from the speakers or a crackling sound during bass peaks could be
caused by oscillation of the amplifier.
In this case, try raising the value or R46 (e.g. 2K7 or even 3K3). This will also slightly increase the input
sensitivity.
If your speaker system includes a piezo driver, make sure it has a 10 ohm/ 1W resistor in series with the
unit.
THE MODIFICATIONS MENTIONED ABOVE ARE ONLY TO BE PERFORMED WHEN REPEATED
INSPECTION OF THE CIRCUIT BOARD, SOLDER JOINTS AND WIRING DID NOT POINT TO ANY
OBVIOUS FAULT S OR MIST AKES OF ANY KIND.
REMARK: Valves are very sensitive to mechanical shocks. Therefore, we recommend not to move the
unit when the valves are hot. Always let them cool down for a while. Avoid sudden temperature changes,
e.g. when the unit is moved from a cold room to a heated room. Always leave it idle for a while, so it can
adapt to the new environmental condition.
A valve that breaks down starts glowing cherry red. Turn off the unit immediately. Usually, the 47 ohm/1W
cathode resistor of the defective valve will also need replacement.
If you have the impression that for some reason, the unit still does not operate as it should, you can
send it to our technical dept. for inspection. Send the PCB only, not the enclosure or the transformers.
Use the original box. Include a detailed description of the fault. Check www.velleman-kit.com for your
nearest Velleman dealer.
Velleman wishes you many hours of listening pleasure !
24
__________________________________________________________________________________________________________________________________________________________
DIAGRAMS
25
_________________________________________________________________________________________________________________________________________________
______
PCB
C1
SK11
R1
SK21
C2
R3
R4
R5
R2
D1
ZD1 T1
C14
R6
R7
RY1
1
T2
D2
C16
D3
R55
D6
J6
SK15
D
TRAFO1
L
2x J22
C20
RY4
VOLTAGE
SELECTION1
0
SK12
C
B
SELECTIO N2
D9
D11
D10
D12
395VDC
D28
R73
C30
f6
C31
SK10
GREEN
D13
D14
R43
D15
D16
SK7
SK8
f7
C28
f8
C23
HIGH VOLTAGE INDICATOR
LD13
C22
12VDC
D19
D17
f2
GRAY
6.3VAC f3
f4
GRAY
R10
D20
J13
J15
J14
R61
J3
2x
300VDC
R75
R74
D18
f1
J12
C25
6.3VAC
J10
C19
C24
R40
GREEN
SK9
f5
C29
R41
R42
R58
2x J2
ZD2
T4
SK6
J8
D30
D7
J11
SK5
390VDC
D29
R8
F1
2x
D27
R9
C21
SK4
BLUE
RED
YELLOW
FROM OUTPUT TRANSFORMER
J1
R57
A FROM POWER TRANSFORMER
VOLTAGE
100V
N
R56
SK14
RY3
D8
120V
SK3
4 Ohm
GND
8 Ohm
TO LOUDSPEAKER TERMINALS
R59
A
230V
12VAC
J9
100-120V/8A Slow
230-245V/4A Slow
AC POWER
SK2
RED
RED
SK1
SK13
R60
YEL LOW
BLACK
YELLOW
BROWN
BLUE
ORANGE
A: 100VAC
B: 120VAC
C: 230VAC
D: 245VAC
J7
J5
B
245V
VIOLET
D
C
C18
T3
RY2
SK22
A: 100VAC
B: 120VAC
C: 230VAC
D: 245VAC
C17
D4
D5
C15
J16
J17
ORANGE
C5
R12
BROWN
BLACK
1
RV5
80VDC
9
BLACK
R49
C6
SK17
GREEN
R19
R18
R13
220VDC
R47
R16
R63
C3
100VDC
9
SK16
155VDC
J18
SENSITIVITY
R17
C4
R64
R11
R62
R44
1
R48
R14
R45
R15
R46
VIOLET
FROM OUTPUT TRANSFORMER
C11
R50
75VDC
V5
190VDC
V6
C12
J19
C13
V1
3
V4
J4 2x
4
C7
C8
K8010: 3.6VDC
K8011: 0.4VDC
1
8
5
K8010: 3.6VDC
R65
R20
K8011: 0.4VDC
R66
5
8
4
1
TO POWER ON SWITCH
6
3
1
SK18
R68
1
VELLEMAN P8010'1 / P8011'1
R69
C9
2
DANGER
HIGH VOLTAGE
3
2
4
K8010: 3.6VDC
K8011: 0.4VDC
1
RED
RED
RED
RED
GREE N
1
D25
D26
R30
R31
C27
YELL0W
-50VDC
BIAS CURRENT ADJUST
LD3 LD4 LD5 LD6 LD7 LD8 LD9 LD10LD11LD12
GREE N
3
J21
YELL0W
2
3
R27
SW2
YELL0W
R2 8
R51
R5 2
RV2
R53
R54
8
YELL0W
RV1
1
26
R26
4
SW1
1
LD2
5
R29
TO POWER ON LED
SK20
R25
1
LD1
R24
5
R23
6
2
5
8
R71
VB2
R32
4
1
R36
R70
R22
3
K8010: 3.6VDC
K8011: 0.4VDC
3
D24
1
R72
VB1
R33
R34
3
VB1 K8010: 1.6VDC
K8011: 0.2VDC
C26
IC1
VB2 K8010: 3.5VDC
K8011: 0.45VDC
RV3
RV4
R37
J20
V3
R35
D23
D21
D22
6
SK19
V2
1
5
3
C10
4
R67
R38
4
R39
2
R21
5
3
!
PCB CONNECTED TO MAINS
HIGH VOLTAGE
N
MAINS
L
F1
4A SLOW @ 230/245VAC
8A SLOW @ 100/120VAC
0
1
100V
A 2
115V
B 3
230V
C 4
245V
1N4007
D20
D19
1N4007
RY4
VR5V122C
470u
C19
3V9
1N4148
OFF
BC547C
R75
15/5W
15/5W
A
B
R2
220K
100u
C15
+V
4u7
1N4148
D1
3V9
C16 C14
ZD1
470u
1N4007
D5
0
BLACK
100V
BROWN
120V
BLUE
ORANGE
245V
VIOLET
GRAY
6.3V/7A
GRAY
GREEN
6.3V/7A
GREEN
YELLOW
50V/0.1A
YELLOW
RED
f1
f2
f3
f4
0
D11
1N4007
D12
D3
1N4007
R57
T3
1N4148
D6
R9
D10
BIAS4
BIAS3
BIAS2
1
2
3
4
D26
SW2
10M 1N4148
R31
330K/0.5W
R54
330K/0.5W
R53
330K/0.5W
R52
330K/0.5W
R51
47u/100V
100u/100V
BIAS1
1N4007
-V
C20
22K
15/5W
R73
395VDC
C21
1N4007
C28
39K/1W
R60
C29
39K/1W
R61
3K9
R30
1K5
R32
4.7
R34
12K
RLO
ADJ
REF
RHI
SIG
MODE
100u
R33
NC
D25
C26
4
8
7
6
5
9
14
13
12
2
V-
11
10
V+
1
18
17
16
15
LM3914
IC1
3
+V
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
4.75
220u/450V 220u/450V 220u/450V
C27
390VDC
39K/1W
R59
1N4148
C17
SI
470u
-50VDC
1N5408
1N5408
D9
D30
D28
D29
1N5408
VR10V121C
RY2
1N4148
D4
D2
1N4148
T2
270/1W BC547C
R55
10K/1W 10K/1W D27
1N5408
R56
1N4007
290
2K2
BC547C
2K2
R3
R4
220K
BC516
T1
R5
290V/0.7A
RED
POWER TRANSFORMER
C 230V
D
VR10V121C
R74
T4
1K5
R22
GREEN
RY3
1N4148
D8
L-93WEGW
RED
LD2
560
1K2
LD1
L-56BHD
1N4148
D23
R24
D24
STB
1N4007
D22
1N4007
R23
C18
470u
ZD2
1K
R8
470
D18
R1
1N4007
D21
ON
SW1
12VDC
1N4007
D17
1N4007
D7
12VAC/2.5VA
7
9
TRAFO1
D 5
RED
LD3
RED
LD4
RED
LD5
RED
LD6
GREEN
LD7
GREEN
LD8
RED
LD9
RED
LD10
RED
LD11
RED
LD12
12K/1W
R58
LD13
RED
+V1
100u/400V
C30
+V2
300VDC
__________________________________________________________________________________________________________________________________________________________
DIAGRAM POWER SUPPLY SECTION
27
_________________________________________________________________________________________________________________________________________________
______
DIAGRAM AMPLIFIER SECTION
28
SI
GND
INPUT
IN
C2
6
2 13
100p
GREEN
6.3VAC
GREEN
VR05R121A
RY1
47n
C1
1K
R7
R48
f4
220/.5W
R40
R50
9
4700u
C23
3.3/.5W
1000u
C22
5
6
1N4007
D13
D14
3
2
R10
4
1
1N4007
C24
47K
220/.5W
GRAY
6.3VAC
f2
220/.5W
R45
220/.5W
f1
1K
R15
680n/160V
C13
C11
680n/160V
80VDC
R44
27K/.5W
R47
R16
680
R49
C12
R62
V5
1M
5
6
2K2/.5W
R46
8
7
ECC81
C3
4
1
C4
330p
47K/1W
R64
3
2
47K/1W
R63
f2 f1
9
300VDC
100K/1W
R14
330p/400V
3K9
R11
110VDC
155VDC
680n/160V
R18
500K
470K
R17
47u/350V
RV5
GRAY
C6
68n/630V
47K/.5W
R42
D16
D15
1N4007 1N4007
8
7
ECC82
V6
100K/.5W
3K9
220/.5W
R43
f3
R41
100K/.5W
R19
220/.5W
7 8
1 14
100K
R6
47u/350V
C25
190VDC
+V2
1M
100K
R37
RV3
100K
-V
R13
75VDC
1K5
R12
C5
68n/630V
220VDC
100K
R27
RV2
100K
-V
R35
-V
100K
R39
RV4
100K
C8
68n/630V
220K
C7
68n/ 630V
C10
68n/630V
C9
68n/630V
100K
R25
RV1
100K
220K
R38
10K
R20
10K
R36
10K
R29
220K
R28
10K
R21
220K
R26
-50VDC
180/1W
R67
4
5
V4
KT88
5
4
R68
180/1W
2
3
7
f3 f4
1
8
8
1
V1
KT88
7
f1 f2
2
3
KT88
5
4
3.6VDC
180/1W
R72
4
5
BIAS3 V3
47/1W
R66
47/1W
R65
BIAS1
3.6VDC
R69
180/1W
f1 f2
2
3
7
1
8
8
1
V2
KT88
7
f3 f4
2
3
3.6VDC
BIAS4
47/1W
R71
+V1
390VDC
47/1W
R70
BIAS2
3.6VDC
VIOLET
GREEN
BLACK
BLACK
BROWN
ORANGE
LS
ZD043
TRANSFO3
GND
RED
YELLOW
BLUE
GND
4 Ohm
8 Ohm
__________________________________________________________________________________________________________________________________________________________
29
_________________________________________________________________________________________________________________________________________________
______
30
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