Re: A100 reverb signal

[Ted Thompson <tthompsn@mail.bcpl.lib.md.us>]

Dallas Selman wrote:
> 
> ----------
> >
> >
> > I believe the AO-39 (main amp) drives the reverb tank (through some
> > current-limiting lamps). The output of the reverb tank is then sent to
> > the AO-35 (reverb amp, this number may be different on later A-100s).
> > The reverb amp provides no drive to the reverb tank. I doubt if the
> > AO-28 can successfully drive the reverb tank, as it is either a low
> > impedance load or (if not lo-Z) requires a substantial signal drive
> > voltage. Some power amplifier is still needed between the AO-28 output
> > and reverb tank input.
> >
> > If the object is to eliminate the internal console speakers, you can
> > either keep the main amp and connect it to a 20W load resistor
> > (necessary to keep from damaging the AO-39 output transformer) or use
> > a small transistor (or IC) amplifier.
> >
> 
> I would rather pull the reverb tank and reverb amp out of the A100 and
> install it in
> the 710 cabinet (now converted to 147) and run the reverb straight off of
> the
> 147 amp to the two  8 ohm stationary 6x9's, but my concern is that running
> an
> 8 0hm load together with the 16 ohm load of the 15" bass and treble
> drivers might load
> the 147 amp improperly. Should I worry about this?
> 
> Dallas....

You will need to hook it up through 2 # 19 lamps, one in series with each 
side of the speaker line, to the reverb pan (this is how a 147RV is done) 
DO NOT place the lamps in series with the main speakers, just in series 
with the reverb pan input.


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