Specifications

Step 5 - Trim, strip and tin the red wire from pad “y”. Solder
this wire to pin 2 of the preamp tube socket V1 (photo 6.23a ).
Step 6 - Trim, strip and tin the yellow wire from pad “z”.
Solder this wire to pin 3 of the preamp tube socket V1.
Step 7 – Neatly organize all wires tightly against the
chassis (photo 6.23a).
Proceed to 6.24
Installing and Wiring the Filaments
Step 1 – Fold the 18 AWG length of green wire in half
and twist the two ends together. Lay this twisted wire to
the side for now.
Step 2 – Twist the two green
wires from the power
transformer together. Trim
these twisted wires to 6” from
the transformer. Save the
excess wire.
Step 3 – Strip and tin the ends
of the green wires from the
transformer. Solder these
wires on the two inside holes
of the terminals of the
indicator lamp (drawing 6.24b).
Step 4 – Strip and tin the ends
of the left over green wires and solder these
wires to the outside mounting holes of the
indicator lamp (drawing 6.24b).
Step 5 – Strip and tin the free ends of the
wires from the indicator lamp and tack
solder in place to pins 2 and 7 of the tube
socket nearest the rectifier tube socket
(photo 6.24c).
Step 6 – With the twisted 18 AWG wire from
step 1, unwind about 1” from the cut ends of
this twisted wire. Strip and tin these ends
and connect to pins 2 and 7 of the octal tube socket nearest the rectifier socket. Solder these
wires in place.
Step 7 – Neatly route the twisted wire pair to the next octal socket. Trim to length, strip and tin
these ends and tack them in place on pins 2 and 7 of the next tube socket.
Step 8 – Untwist 1” from the cut ends of the twisted pair wires. Strip and tin these ends and
solder (along with other wires) to pins 2 and 7 of the second power tube socket (photo 6.24c).
6.24
TubeDepot.com 23
NOTE
To get a very even twist as well as to speed up the process, use a handheld drill to twist the
two halves together. Place the loose wire ends into a drill and slide the opposite loop around
a screwdriver (photo 6.24a) and let the drill slowly rotate. Twist until tight.
photo 6.24c
drawing 6.24b
On both 9 pin preamp tube sockets, pins 4 and 5 are wired together. This is accomplished by
inserting the tinned end of the filament wires through both of these pins. Apply solder only
after both wire ends are inserted through these holes.
NOTE
photo 6.24d
photo 6.24a
theses yellow and
green wires do not
share the same
terminals.