7. Extend the RED lead from the LEFT OUTPUT TRANSFORMER and the RED lead from the RIGHT
OUTPUT TRANSFORMER to the 80 Mfd terminal on the QUAD CAP having the HALF CIRCLE
symbol. This is the terminal that faces the REAR of the amp.
8. Shorten (if necessary) and connect the 3 inch wire from lug 5 of the Supplementary Cap Module
(SCM) to the same 80 Mfd terminal on the quad cap having the HALF CIRCLE symbol as described
in the step above. Connect the 6 inch wire coming from lug 1 of the SCM to one of the two main
grounding lugs next to the quad cap.
9.
Twist together the two CHOKE leads from right side choke. Connect one choke lead to 80 Mfd
terminal on the quad cap having the HALF CIRCLE symbol and the other choke lead to the 40 Mfd
terminal on the quad cap having the SQUARE symbol. Lengthen the two leads from the second
LEFT SIDE choke by adding about 4 inches of wire to each of the two leads. After you lengthen
these two leads solder each connection (S) and be sure to insulate the two connections with black
electrical tape or insulated shrink tubing. (500 Volts DC here!) Twist together and connect the two
choke leads from the LEFT side choke to the same two 80 and 40 Mfd terminals on the quad cap
as you did with the right side choke.
10. Extend the two BLACK leads from the power transformer around the power transformer as shown
in the pictorial. Connect one BLACK lead to lug “A” of the fuse post (S) and one BLACK lead to
lug # 1 of the on/off switch (S).
11.
Connect the BLACK lead from the RIGHT OUTPUT TRANSFORMER to the SMALL GROOVE near
the end of the RIGHT BLACK speaker terminal. Connect one end of a wire to the right BLACK
speaker terminal’s small groove (S). Connect the other end of this wire to one of the grounding
lugs next to the quad cap. Connect the BROWN (4 ohm) wire to the SMALL GROOVE near the end
of red binding post that is closest to the black post. (S) Connect the ORANGE wire (8 ohms) to the
SMALL GROOVE near the end of red binding post that is furthest away from the black post. (S)
* The remaining YELLOW wire from the output transformer will be connected at a later step in
construction.
12. Repeat step 11 above for the LEFT OUTPUT TRANSFORMER and the LEFT speaker terminal.
13. Connect the BLUE wire from the LEFT OUTPUT TRANSFORMER to pin 3 of V3. Connect the
BLUE/WHITE wire from the LEFT OUTPUT TRANSFORMER to pin 3 of V2. Connect the BLUE wire
from the RIGHT OUTPUT TRANSFORMER to pin 3 of V6. Connect the BLUE/WHITE wire from the
RIGHT OUTPUT TRANSFORMER to pin 3 of V7.
This is an incomplete VTA ST-120 manual
