[sdiy] Help with ARP Op-Amps

[Don Tillman]

   Date: Wed, 19 Sep 2001 16:55:04 -0400
   From: Gavin Muir <gmuir at sympatico.ca>

   Unfortunately, I don't have the service manual in front of me right
   now, but the op-amps I need to replace are 1) the comparator in the
   internal clock circuit, and 2) the comparator in the VCO3 circuit
   which generates a square wave from the saw output.

   Now, both of these op-amps are the same type, and are simply
   referenced by an ARP factory number. It looks like perhaps they
   were selected by ARP for some particular spec, maybe low offset.

Those are LM301AN's, like almost all the opamps in the ARP 2600.

I don't think a low offset spec is an issue here as those points in
the circuit have trimpots at their inputs.

   Does anybody have an idea what might be a suitable replacement for
   these? I have heard of people subbing in LF411s for the 301s. Would
   a 411 work well here as well?

I haven't tried it myself, but it sounds like a very reasonable
choice.

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com