Cathode
Cap Mod:
add $35.00
On the plexi and metal
face amps up through
1972, there was a .68
cap on the second stage
cathode circuit.
It gave an increase in
gain and midrange. My 50
watts come stock with
this cap but you can
order this amp with a
small switch (that I
install on the front
panel) that takes this
cap in and out of the
circuit.
|
Gain
Stage Mod:
add $100.00
I also offer my gain mod,
which works like this: the
input tube has two sides,
channel one uses one half
of the tube, channel two
uses the other half.
On the gain mod, one half
of the tube drives the
other half of the tube
using the volume two pot
as the gain control and
the volume one pot as the
volume control. This
gives you a great amount
of controllable
gain. When you plug
into the channel one
input, it bypasses the
extra gain stage and works
like a stock plexi preamp.
Both channels work with a
master volume that I
install on the front or
back of the amp. The
master volume is included
in the gain stage mod.
Tube-diode
rectifier
switch:
add
$50.00
|
Negative
Feedback Control:
add $35.00
Also available is the
optional negative
feedback control. In
these amps the negative
feedback resistor varied
from 47k to 100k
depending on the year.
With the control
(mounted on back of amp)
you can adjust this from
47k to 100k. This will
give you more or less
power amp gain.
Master
Volume
Mod:
add $50.00
Pre or post Pl master
volume. I install these
on the rear of the amp
or in the front in an
unused input jack hole.
Adjustable
line out
add
$50.00
Zero
Loss Effects loop
with bypass switch add
$150.00
|