Vintage Synth Repair

Thanks, I'd like to find new equivalents if possible..I find those old CMOS ic's to be inherently flaky...so anyway I've gone for new 40174's as I need at least two to get the controls working properly again..




________________________________
From: GB <grantbt@...>
To: eggwheatis@...
Cc: vintagesynthrepair@yahoogroups.com
Sent: Sun, 27 June, 2010 17:55:51
Subject: Re: [vintagesynthrepair] Oberheim OB-X and Cmos 74 series + Autotune

 
We have a bunch of "new" 74C at my work. They are still in the original 
rails, but were bought many years ago. If you give me a list of what you need. I 
can see what we have. Also, the sockets can get dirty, so sometimes even 
reseating the chips helps  or replacing the sockets with new double-wiping 
ones.
 
GB
 
----- Original Message ----- 
>From: Philip 
>To: vintagesynthrepair@yahoogroups.com 
>Sent: Sunday, June 27, 2010 9:46 AM
>Subject: [vintagesynthrepair] Oberheim 
>  OB-X and Cmos 74 series + Autotune
>
> 
>Hi, 
>  I'm repairing a hopelessly faulty OB-X...I'm dealing with all the CPU and 
>  digital control side first....all the voice board faults secondly.. 
> 
>
>
>First question...it' s packed with early cmos 74 series IE 74C174 
>  etc...what are the best equivalents for these and other 74C types? 74HC? 40174 
>  for example?
>
>
>Second question: How long is the Autotune function supposed to 
>  run for? At the moment it stays on for about 2 seconds after button 
>  press...not that it seems to do much as it's hopelessly out of tune with 
>  various boards missing a VCO here and there...
>
>
>Thanks, Philip.
>
>