14. Remove the outside nut and larger flat washer from the switch. The smaller flat washer goes
against the INSIDE of the chassis. Place the larger flat washer on the chassis TOP and nut on top
of the flat washer. On the inside of the chassis make sure that the six terminals on the switch face
from the front to the back of the amp so that the switch toggle on the top may be switched from
FRONT to BACK and not side to side. Refer to the triode/pentode pictorial for help if needed.
15. Center the two switches in the holes and tighten the nuts lightly with square nosed slip-joint
pliers. Check alignment of the two switches. If alignment is not correct move the switches slightly
until alignment is correct. Make your final tightening but DO NOT OVERTIGHTEN THIS NUT or you
could break the switch.
16. Mount the two TWO lug terminal strips back to back in the single central 4-40 hole between the
two triode/pentode switches. Try to keep the strips straight and parallel to the sides of the amp as
you tighten the screw. Check the color photo.
17.
NOTE – At this time DO NOT MOUNT the two front power takeoff sockets, the front slide switch (or
stepped attenuator if you have the stepped attenuator option) which fits into the stereo/mono slot
or the input jacks. These three items must be mounted after installation of the VTA driver board.
WIRING – Each length of hookup wire specified should have approximately ¼ inch of insulation
stripped from each end unless otherwise specified. Wires from the three transformers should be
shortened appropriately to the correct length to reach their terminal point.
If you see the
symbol “(S)”, this means to solder that connection at that time. If the symbol is not
there DO NOT SOLDER that connection at that time.
The 20 gauge tin coated solid core
copper wire supplied with this kit is the recommended wire to use. Only rosin core solder is
recommended for soldering. Always make a solid mechanical connection with your pliers to the
terminal point before soldering. Always keep the chassis and transformers on a soft surface like
a towel so they won’t get scratched. Orient the chassis so that the power transformer is towards
you. Oriented this way the, the LEFT channel is on your LEFT and the RIGHT channel is on your
RIGHT.
1. Twist the pair of WHITE leads from the power transformer together and extend the wires to socket
V1. Connect one lead to pin #2 of V1 (S) and one lead to pin #8 of V1.
2.
Twist the pair of RED leads from the power transformer together and extend the wires to socket
V1. Connect one lead to pin # 4 of V1 (S). Connect the other lead to pin # 6 of V1 (S). NOTE - If you
have the OPTIONAL VTA-TDR (Time Delay Relay) then do steps 5, 6 and 7 on the TDR manual
under "Wiring to the board" instead.
3. Twist the pair of GREEN leads from the power transformer together and extend the wires to
socket V2. Connect one green lead to pin # 2 of V2 and one green lead to pin # 7 of V2.
4. Twist the pair of BROWN leads from the power transformer together and extend the wires to
socket V7. Connect one brown lead to pin #2 of V7 and the other brown lead to pin #7 of V7.
5.
Twist the BROWN/YELLOW and GREEN/YELLOW wires from the power transformer and extend
the wires to the 3 lug terminal strip. Connect the BROWN/YELLOW lead to lug # 3 - the lug closest
to the power transformer. Connect the GREEN/YELLOW wire to lug # 1 – the lug furthest from the
power transformer. NOTE - If you have the OPTIONAL VTA-TDB (Time Delay board) connect these
two wires to the proper eyelets on the TDB board instead - as instructed in steps 2, 3 and 4 of the
TDB manual under "Wiring to the board".
6. Connect the RED/YELLOW lead to one of the grounding lugs next to the quad cap filter capacitor.
