[sdiy] On cloning, and the Oberheim VCO

[Mike I]

My 1975 Motorola book shows a variant of the 741 called the 741S.... this is
a lot faster than the normal  741, and has a S.R. of 10V/uS. Suggested for
use at the output of the 1408 DAC. Whether this was a Motorola-specific
device, or available from several mfrs at the time, I do not know. Maybe it
was used in the SEM VCO???

Some synth schematics from back then show a 741 (S), but this was used to
indicate a normal 741 that was selected for low offset or some other
parameter.
Mike



----- Original Message -----
From: Roy J. Tellason <rtellason at verizon.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 14, 2008 8:30 PM
Subject: Re: [sdiy] On cloning, and the Oberheim VCO


> On Monday 14 April 2008 16:49, mike ruberto wrote:
> > I actually do not recommend upgrading any of the opamps. Nothing else
> > I've tried works properly for A4. Something particular about the 301
> > seems to be at play here. Also, I found oddly enough that modern 741s
> > do not work so well for A2 and A3. I tried some NOS 70s era 741s and
> > got much better performance in my clone circuit.
>
> Now that's interesting.  I wonder what they've changed in the lowly 741?
I
> have some that have been hanging around for ages,  and have been wondering
> what I might do with them.  (A null indicator for a bridge was one project
> that came to mind...)  Some of them might even be Radio Shack parts.
Think
> they might work even better?  :-)
>
> --
> Member of the toughest, meanest, deadliest, most unrelenting -- and
> ablest -- form of life in this section of space, a critter that can
> be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
> -
> Information is more dangerous than cannon to a society ruled by
lies. --James
> M Dakin
>
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