[sdiy] What to do with REALLY obsolete parts?

[Michael Ruberto]

I forget who it was but somebody had mentioned that these early parts were 
built to tighter specs than their modern siblings because they were 
expensive parts then. Back in '71 a 741 was pretty hi-tech stuff i guess ;)

>From: "dj hohum" <djhohum at gmail.com>
>To: "Michael Ruberto" <frankentron at hotmail.com>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] What to do with REALLY obsolete parts?
>Date: Wed, 20 Jun 2007 09:19:11 -0700
>
>Well, the metal can op amps certainly look WAY cooler in circuits. But
>most of mine are the 14 pin dip variety. My LM711s are all NOS metal
>can types though.  I've certainly seem some validity in using metal
>can transistors in RF circuits because the heat dissipation is better.
>I can't imagine what might have been better about old metal can 741s.
>Perhaps some of our list gurus can shed some light on that.
>
>On 6/20/07, Michael Ruberto <frankentron at hotmail.com> wrote:
>>
>>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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