MCA Series - Output Transformer Installation
Optional transformers for 25/70/100 Volt speaker systems:
TDT50 = MCA 8050 individual channels (50 Watts)
TDT100 = MCA 8050 bridged channels (100 Watts)
TDT150 = MCA 8150 individual channels (150 Watts)
TDT300 = MCA 8150 bridged channels (300 Watts)
CAUTION: Transformers must be installed by qualified
technical personnel only. To avoid fault conditions, HighPass Filters must be assigned on those channels having
transformers installed. Place appropriate 'xfmr' voltage
stickers in the corresponding boxes on the rear panel.
To install TDT50 or TDT150 on individual channels:
1) Disconnect AC power from the amplifier.
2) Remove the amplifier top panel.
3) Install transformers & hardware on chassis posts
(see diagram to right). NOTE: When installing two
transformers on the same post, use only a rubber
washer in between. Only one metal dome washer and
one nut should be installed on each post (at the top).
4) Locate the front edge of the amplifier circuit boards
(see diagram below). Each circuit board represents
two amplifier output channels (odd & even).
5) Remove the red & black jumper wires from the
associated amplifier channel.
6) Connect transformer blue wire to amp + terminal
(rear - near power supply connector).
7) Connect transformer green wire to amp - terminal
(front - near power supply connector).
8) Connect transformer black wire to out - terminal
(front - away from power supply connector).
9) Connect appropriate transformer wire (brown = 25V;
orange = 70V; yellow = 100V) to out + terminal
(rear - away from power supply connector).
10) Replace top panel, assign channel HPF, & apply
appropriate rear panel 'xfmr' voltage sticker.
To install TDT100 or TDT300 on bridged channels:
1) Disconnect AC power from the amplifier.
2) Remove the amplifier top panel.
3) Install transformers & hardware on chassis posts
(see diagram to right).
4) Locate the front edge of the amplifier circuit boards
(see diagram below). Each circuit board represents
two amplifier output channels (odd & even).
5) Remove the red jumper wires from both amplifiers
(odd & even channels on same circuit board).
6) Connect transformer blue wire to amp + terminal on
odd channel (rear - near power supply connector).
7) Connect transformer green wire to amp + terminal on
even channel (rear - near power supply connector).
8) Connect transformer black wire to out + terminal on
even channel (rear - away from power supply
connector).
9) Connect appropriate transformer wire (brown = 25V;
orange = 70V; yellow = 100V) to out + terminal on odd
channel (rear - away from power supply connector).
10) Replace top panel, assign odd channel HPF, & apply
appropriate rear panel 'xfmr' voltage stickers.
NUT
METAL
DOME
WASHER
RUBBER
WASHER
TRANSFORMER
RUBBER
WASHER
BOLT
ODD CHANNEL
out
EVEN CHANNEL
amp
+
red
+
-
black
-
amp
power supply
connector
out
+
red
+
-
black
585-9156-00