Install a HI / LO vibrato speed range select switch
A switch can be installed so that two separate vibrato ranges
can be selected. These ranges can be wired to be
footswitchable between the two speeds.
Step 1
– Drill a hole in the faceplate and mount the toggle
switch (photo 11c).
Step 2
– Solder a 1M resistor between the inside pin and
one outside pin of the toggle switch (drawing 11d).
Step 3
– Solder a wire between point “B” on the back of the
intensity control pot and the outside lug of the speed range
switch (a wire should also connect to V3, pin 7 as before).
Step 4
– Solder a wire between the outside lug of the
range switch and the middle “B” terminal of the footswitch
jack (drawing 11e).
Step 5
– Solder a 20AWG jumper wire between terminals
“D” and “E” of the footswitch jack as shown.
Install a Tube / Solid State Rectifier
Selector Switch
Solid state rectifiers will improve the punch of the
bass frequencies as well as the overall output
wattage of the amp. By installing a selector switch,
like below, you can select between either rectifier
type depending on your playing style.
If you have an EZ81 rectifier, refer to drawing 11f
for the proper wiring diagram.
If you have a GZ34 (or other octal rectifier), refer
to drawing 11g for the proper wiring diagram.
In both illustrations, install the two 1N4007 diodes
across the tube socket, joining together at an
unused pin on the socket. Then wire the SPST
toggle switch between the conjunction of the diodes and the output of the rectifier tube.
56 TubeDepot.com
photo 11c
drawing 11f
9 pin tube
drawing
11d
C
A
E D
B
drawing 11e
drawing 11g
Octal Tube
from V3, pin 7
