[sdiy] What to do with REALLY obsolete parts?

[Michael Ruberto]

This can depend on the circuitry. In my SEM clone VCO i had to use old can 
type 741s manufactured in the early 70s to get the damn thing to perform 
properly. The new 741s I tried just wouldn't cut the mustard for some 
reason.

M. A. Ruberto

>From: "dj hohum" <djhohum at gmail.com>
>To: "Ian Fritz" <ijfritz at comcast.net>
>CC: Florian Anwander <Florian.Anwander at consol.de>, 
>synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] What to do with REALLY obsolete parts?
>Date: Tue, 19 Jun 2007 16:45:09 -0700
>
>Ok, but a more modern 8 pin 741 can be used for that, correct? Is
>there a particular reason that one would want to use the older 14 pin
>dip 741?
>
>On 6/19/07, Ian Fritz <ijfritz at comcast.net> wrote:
>>At 03:17 PM 6/19/2007, dj hohum wrote:
>> >Well, sure. My question was more about whether they are used in any
>> >vintage synths in any way that people want to use the original parts.
>> >I suspect that the chips I listed won't have any value for hundreds,
>> >maybe thousands of years :) Like old TTL chips, sometimes it's best to
>> >just toss them out. The UA726 has become valuable because there is no
>> >reasonable substitute, the same cannot be said for old op-amps.
>>
>>Once in a while the slow slew rate of the 741 is part of the design.  I'll
>>buy 'em if you don't want 'em.  :-)
>>
>>    Ian
>>
>>
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