Differential Reverb (better subject line!)

[Don Tillman]

   From: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
   Date: Thu, 13 Aug 1998 11:56:45 +0200

   >Their application note has half-a-dozen drive circuits.

   Are they on the web somewhere ?

No, unfortunately.  You have to phone or write to them to get the
application notes.

Sound Enhancements, Inc.  (Accutronics)
185 Detroit Street
Cary, IL  60013
Phone: 847 639-4646
Fax:   847 639-4723

   From: honcho at paia.com
   Date: Wed, 12 Aug 98 23:20:25 CDT

   Don Tillman writes:
   >Invert the receive transducers instead of the send transducers; hum
   >cancelling for free!

   Really good suggestions, Don, thanks. But remember that the 
   transducers are in two tanks and not particularly close together so 
   that hum rejection _might_ not be that great. 

Ahh, I was picturing a situation where you'd try to get the tanks as
physically close together as possible.  Hum pickup can be a drag if
you mount a spring reverb in the same rack as a Carver power amp.
(How's that for asking for trouble?)

Another advantage of wiring the receive coils out of phase is some
immunity to physical bumps and reverb feedback.

So I'm thinking that to really take advantage of all that you'd want
to disassemble the two reverb tanks and mount the two spring units
very close together on a larger common shock-mounted subassembly.
That way the receive coils would share almost all physical and
electrical disturbances and would cancel somewhat.

  -- Don