[sdiy] "Zerolytics"

[René Schmitz]

On 11.05.2020 17:44, Steve Lenham wrote:
> On 05/05/2020 11:31, Gordonjcp wrote:
>
>> You'll never need to "recap" a power supply.  Ever.  Unless you've 
>> done something crazy and actually damaged it, of course.
>
> Ooh - I just received a Dynacord DRP20X (late 80s reverb unit) with a 
> huge hum on the output. There are dropouts visible at 100Hz on the -5V 
> analogue rail, and the input to the 7905 has massive 100Hz ripple. The 
> unit is full of odd bakelite-bodied East German electrolytic caps, 
> many of which have cracks and some of which have stuff leaking from 
> the cracks.
>
> It's a complete mystery what the fault might be - anyone got any ideas?
>
Watch this:

https://www.youtube.com/watch?v=GMNQDoFpYQY


Best,

  René

-- 

synth at schmitzbits.de
http://schmitzbits.de