reverb can w/synths

[J. Larry Hendry]

> From: Barry L Klein <Barry.L.Klein at wdc.com>
> 
> I'm still at a loss for feedback on reverb can preferences.
> I guess not too many of you have played with them.  
> One suggested an LM387 driver but that IC has been
> discontinued by glorious National Semiconductor.  I'd
> still like to know of any preferences for driving circuits

I have a PAiA spring reverb that uses two tanks.  The op amp used for both
driving and recovery is 1/4 of a Raytheon RC4136N.  There is not much gain
on the input stage.  The driver coils are connected out of phase with each
other in series across the feedback resistor for the input driver.  The
output stage has lots of gain with a ratio of input to feed back resistor
of 4.7K to 2.2 meg.

> - I saw one description recommending a current-drive arrangement
> (opamp feedback path), but this requires an isolated driver coil.  

If I understand correctly, the coils on the PAiA tanks are isolated in that
neither side of the driver or receiver coils are tied to ground within the
device.

Larry Hendry