DAC90a extra electrolytic?

[Bushbaby]

Hi All,
Have a look at the pic of the Ivory DAC90a radio that I am currently working on. It is working but I have noted that I have an additional 8uF electrolytic on C20/21 HT smoothing cap. The wiring also leaves a lot to be desired!

Should I replace the HT cap??

Any thoughts/comments welcome.

Regards

Rob
[attachment=1041]

[tiv48]

hi rob i would try disconecting that 8mf and see what happens you may be suprised, but if it is faulty it would be nice to replace it if nothing else because it looks better.i may have one (used) .i think it will be hard to get get one nos that will fit. you could of corse restuff it with new caps.
rob t

[OldTickTock]

The Bush main smoothing can in the DAC90A was very reliable I have six of these and all are OK. The 8uF being tacked in like that makes me think maybe the 16uF side was starting to fail and a bit of hum was introduced so they tacked in the 8uF to eliminate it. As Rob says remove it see what happens.

Chris

[Bushbaby]

Hi All,
Thanks for all the offerings - much appreciated.
Thinking about it it does have a noticable amount of hum which does suggest that its failing. Removing the 8uF should make this worse. If this is the case, I agree that the best option will be to stuff the cap with new electrolytics.

Has anyone had experience of doing this and is it straightforward?

Thanks again

Rob

[tiv48]

yep i have done them (noy dac90a)but as they say a picture is worth a 1000 words http://www.youtube.com/watch?v=YwGBTmqJw3o also found this http://www.nmr.mgh.harvard.edu/~reese/el...s/#rebuild
rob t