Specifications

Step 4 – Insert a #6 x 1/4” screw into the mounting hole of the
V2 socket nearest the chassis edge. Secure this screw with a
#6 KEPS nuts.
Step 5 – Bend a #6 solder tab at a slight angle.
Step 6 – Insert a #6 x 1/4” screw into the remaining
mounting hole of the V1 socket.
Step 7 – Install the #6 solder tab and #6 nut (not a KEPS
nut) (photo 6.12e). Tighten firmly.
Proceed to 6.13
6.12.2 shock mounted V1 socket installation
Step 1 – With a 1/4” drill bit (a step bit is excellent for this), enlarge the
preamp tube socket mounting holes in the chassis (photo 6.12f). Smooth
edges of holes (remove burrs) with a deburring tool or larger drill bit.
Step 2 – Insert the small grommets in these holes (photo 6.12g) making
sure they are properly seated and the hole in the center is clear.
Step 3 – Insert the tube socket from the outside of the chassis and rotate
the socket so that pin 8 of the tube is closest to the chassis edge.
Step 4 – Insert a #6 x 3/8” screw into mounting holes of the socket.
Step 5 – Install a #6 flat washer on each of the exposed screws.
Step 5 – Install a #6 solder tab on the screw nearest the chassis
edge and secure with a standard #6 nut (not a KEPS nut).
Step 6 – Install a #6 KEPS nut on the remaining screw and tighten.
Step 7 – Seal both nuts with fingernail polish (photo 6.12h).
Step 8 – Strip and tin ends of a 3” length of 20AWG black wire.
Step 9 – Solder one end of this 3” wire to the above solder tab
(drawing 16.14c).
Proceed to 6.13
Installing the Electronics Assembly
Step 1 – Install the four #6 x 1/2” bolts into the drilled holes.
Step 2 – With masking tape, tape down the heads of these screws
to the chassis to hold them in place (photo 6.13a).
Step 3 – Turn chassis over and install the four 1/4” nylon standoffs
onto the four #6 x 1/2” bolts.
Step 4 – Mount the electronics assembly onto the four #6 X 1/2” bolts and standoffs, each
hole of the board corresponding to a bolt. Orientate the board with the filter caps toward the
power transformer.
6.13.1 PCB with traditional tube socket installation
Step 1 – Apply the four #6 KEPS nuts on the exposed four #6 x 1/2” bolts and tighten them
down finger tight.
Step 2 – Remove the masking tape and finish tightening the nuts down to the board.
Proceed to 6.14
6.13.2 PCB with shock mounted tube socket installation
Step 1 – Install a #6 solder tab on the board mount nearest the V1 tube socket (photo 6.13b).
Step 2 – Install a #6 standard nut (not a KEPS nut) on this screw along with the solder tab
and tighten (photo 6.13b).
Step 3 – Install three #6 KEPS nuts on the remaining three #6 screw mounts and tighten.
6.13
TubeDepot.com 17
Photo 6.12g
photo 6.12f
photo
6.13a
photo 6.13b
Photo 6.12h