PRODUCTS & MODIFICATIONS

TUBE BASS/TREBLE TONE CONTROL

This unit mounts directly next to the
organ preamp and provides 16 dB of
bass and treble boost or cut (at 30 Hz
and 15 kHz, respectively).  The circuit
uses a 12AU7 tube and is a good way
of getting extra bass volume and
response out of the organ pedals,
without making unnatural modifications
to the organ.  On older organs where
the generator filter capacitors have
aged, this unit is useful in restoring
some of those lost highs.

BUILT IN TONE CONTROL

The same circuit as the above unit,
only we can build it right into the organ
preamp.  Both B2/C2 and B3/C3/A100
pre-amps can be modified this way.  
Finished tone control modified
pre-amps are available for exchange,
or you can send us your preamp for
modification.    *The tone control circuit
is in the foreground (shielded tube and
bass/trebble/volume knobs).

HIGH POWER LESLIE SPEAKER

Using a design developed by Electronic
Instrument Services, we can Bi-Amp
original  tube Leslies.  This modification
retains the stock 40 watt tube amp and
dedicates it to just the trebble speaker
driver.  A 250 watt solid state plate
subwoofer amp is mounted on the back
panel and handles the low frequencies.  
The result is incredible power while still
maintaining the classic warm tube amp
sound.  This is one loud Leslie!  More
importantly, it is a very musical speaker,
providing the warmth and tube crunch
that is lacking in solid state higher
power Leslie speakers and their
aftermarket counterparts.