INSTRUCTIONS
NOTE – You may or may not want to construct the VTA driver board BEFORE or AFTER you attach the
chassis parts. If you wish to construct the VTA driver board at this time skip ahead to the VTA driver
board instructions which are inside the VTA package and proceed with its construction. When you are
through come back to this point and begin mounting the chassis parts.
Obtain the chassis. Unscrew the four 6-32 chassis screws and remove the bottom cover. Taped
inside the bottom cover are four round black rubber “feet”. Remove the paper cover from each of the
rubber feet to access the sticky bottom of each foot. Attach firmly each rubber foot to the outside of the
chassis bottom cover directly over each of the four holes in the bottom cover. Orient the chassis with the
power transformer cutout facing you and mark “V1”, “V2”, “V3”, “V6” and “V7” with a felt tip marker on
the inside of the chassis next to the appropriate tube socket. (tube socket numbers shown on the
pictorial) After completing each assembly instruction place a check beside the assembly instruction
number.
1.
Mount the FIVE octal sockets that fit on the chassis TOP from the BOTTOM OF THE CHASSIS with
¼ inch long 4-40 stainless steel screws and 4-40 kep nuts. Use the pictorial to orient the keyway of
each tube properly. On V2, V3 and V6 mount a single GROUND LUG around the outside screw
closest to the side of the chassis and face the lug towards pin 8. On V7 mount ONE ground lug
around the outside screw and face this ground lug towards pin 8. Mount the other ground lug
around the inside screw and face this second ground lug towards the back of the amp. Tighten all
nuts securely. Don’t lose the extra two grounding lugs.
2.
Disassemble the three gold plated speaker binding posts from each of the two mounting
plates.
Attach the LEFT and RIGHT mounting plates to the back INSIDE of the amp with 4-40
hardware. Reassemble the three speaker binding posts on each of the mounting plates. One of the
round plastic colored spacers (red or black) goes INSIDE the chassis and the other spacer (with
the binding post attached) goes OUTSIDE the chassis. Make sure that the BLACK terminal is on
the side that says “G” on the outside of the chassis frame and the two RED terminals are on the
side that says "4 8 16". Back off on the red or black plastic nut on the OUTSIDE of the chassis on
each binding post and rotate each post so the hole on the outer binding post faces UP. Place the
flat washer up against the inside spacer, then the star washer, then the two nuts. Tighten the three
studs on the left and right sides with the gold plated nuts. Use a slim screwdriver through the hole
in the outer post to keep the post facing UP as you tighten the nuts. NOTE - The outer plastic
spacer with binding post will lock up against the chassis and NOT the mounting board.
3. Mount the rubber grommet in the 3/8 inch hole in the back CENTER of the chassis.
4. Mount the fuse holder in the "D” shaped hole in the back of the chassis. The slim black washer
goes on the OUTSIDE of the chassis. Tighten the large nut on the inside of the chassis but do not
over tighten as this may cause the plastic threads to strip. Check and make sure that the 5 amp
SLO-BLO fuse is inside the fuse holder. (press IN and rotate the cap counterclockwise)
5. Mount the SPST on/off switch on the REAR of the chassis with 4-40 hardware. Make sure that the
two terminals on this switch are close to the UNDERSIDE OF THE CHASSIS TOP SURFACE.
Check the pictorial.
6. Place the 4 rubber isolation washers on the ends of each of the four bolts of the PA-060-120 power
transformer. Mount the power transformer in the large center cut out. The wires should face the
FRONT of the chassis. Fasten the power transformer to the chassis with four 8-32 kep nuts. In the
original amp a metal cable clamp was used on each of the two front bolts as seen on the pictorial.
These clamps are not really necessary as the wires will stay in place fine when soldered.
7. Assemble and mount the Supplementary Cap Module (SCM)
A. Obtain the five lug terminal strip from the SCM kit plastic bag
