Re: DAC 90A Smoothing Capacitor replacement
Hmm.
£10 is not much to splash out on a hobby. But it's still fun to try to find out, beforehand.
If you had a known-good UL41 you would do a swap as a trial, because it's easy, quick, even if the likelihood of success isn't definite. But you haven't.
You could short pin 3 of the UBC41 to chassis. If the hum largely goes, then the fault is not in the UL41 and I'd say, get another UBC41.
You might try YouTube to see if anyone 's put up a video of their DAC90a, something to compare yours against!
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