The A-155 uses only CMOS standard circuits of the 4000 series (CD4011,
CD4024, CD4051, CD4053) and standard operational amplifiers (TL0xx series).

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
> Gesendet: Donnerstag, 14. August 2014 10:40
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: AW: 1 HELP!! Malfunctioning 155, gig on
> Saturday!!!
>
>
>
>
> Wow, it was a long time since last message and I still haven't
> gotten the 155 fixed.Im sure it is old, I bought it along time
> ago, and then it was second hand!Regarding sending it to Doepfer
> to be fixed. Im in Norway, which strictly is not in the EU.
> However I did send an item to you for repair once before. I
> marked the package very carefully as a repair item and I believe
> you had no problems.
> However, Ive been building alot of my own modules recently and am
> pretty confident that my soldering skills are pretty up to
> scratch. However, more than that (testing chips of trouble
> shooting is right out!!!)
> So I have some questions, can you be certain its the chips you
> mention, could I have a go at swapping them myself
> Are the chips regular, readily available ICs I can get from Tayda
> or Mouser
> Can you let me know what they are Or are they specialised
> Could I get them from you for example
> I would of course put in IC holders this time.
> Regards
> Mark
>
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>