Re: Audio problems on VIC-20

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Wed, 5 Jul 2017 21:16:12 +0200 Message-ID: <CAESs-_zM7=RYVQWJ0d4rMdLXNT_nAZS=xWkb2B+T=fCxhq8a3w@mail.gmail.com> · francesco.messineo_at_gmail.com

On Wed, Jul 5, 2017 at 9:09 PM, Ethan Dicks <ethan.dicks@gmail.com> wrote:
> On Wed, Jul 5, 2017 at 2:23 PM, Francesco Messineo

>>
>> Inside the VIC metal box there's a 10k potentiometer that sets the
>> video signal level. Again, this signal is then buffered by another
>> emitter-follower. A DC-blocking electrolytic is placed before the base
>> input to the emitter follower, so this one might also be dried out and
>> have high  ESR.
>> Your best friend is an oscilloscope in both cases.
>
> Awesome advice.  I'll keep your words in mind as I check the
> schematics.  Thanks!

just don't quote me on the 10k trimmer. It could be anything from 1k
to 1M actually (but it does set the video level). I don't come to see
and repair many VIC-20s lately :/

Frank

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