Vintage Synth Repair

Ethan
In case you haven't found your IC's. I have some additional info for
you, plus I have the IC's.

The LM3900 subs to the following numbers, Baldwin, #0514-062023;
Gulbransen, 801823; Lowrey, 991-024542; Wurlitzxer, 142621, 662112;
ECG-992.

The LM1458 subs to the following: Baldwin, 514-126338, 514-063293;
Gulbransen, 801873, 04110; Kimball, 551-009-00; Lowrey, 991-025244-000;
Wurlitzer, 142648, 154278; ECG-778A.

Let me know if you still either or both of them.

Keith Niver
certified MITA technician

mtcasino@... wrote:

> Digikey dose not have the RC-4558 op amp. Newark electrinics dose but
> there is a $ 20.00 minimum.They are about $ .79 each. The Norton op
> amp should be $ .49 or less. mike
>
>      ----- Original Message -----
>      From: jjhannon2001
>      To: vintagesynthrepair@yahoogroups.com
>      Sent: Monday, July 01, 2002 4:10 PM
>      Subject: [vintagesynthrepair] Re: Help Identifiy IC's
>       --- In vintagesynthrepair@y..., "ethanzer0"
>      <ethanzer0@y...> wrote:
>      > Hello,
>      >
>      > I am trying to identify
>      > the two ICs on the ARP
>      > 4072 submodule.  The
>      > schematic shows no ICs
>      > nor does the parts list.
>      >
>      > TIA,
>      >
>      > Ethan
>
>      Ethan, both IC's are linear types. One is the LM3900N
>      (national
>      semiconductor) and the other is a LM1458 (also national
>      part) you can
>      also use a RC4558 instead of the 1458. The LM3900 is drawn
>      as 4
>      seperate amps in the schematic because there are four OP
>      Omps in the
>      one 14 pin IC package.  You should be able to get these from
>      Digikey
>      on line. (digikey.com?)
>
>      Regards,
>      John
>
>
>
>
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