[sdiy] "Zerolytics"

Neil Johnson neil.johnson71 at gmail.com
Mon May 11 18:27:48 CEST 2020

Hi Steve,

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?
> ;-)

It's probably low on mojo.  Gear that vintage usually needs its mojo topping up.


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