dac90a - to replace or leave alone??

[tiv48]

is the hum loud with the volume turned down?

[Steve_P]

Well, that does point to the smoothing can to me. If you've changed it, is the new one fitted right?

If not, it may be breaking down under load. If you've played with the wiring round there, is it wired in right?

Cheers,

Steve P.

[Bushbaby]

Hi Steve,
It was working fine a few months ago when I switched it on when David (Yorkie) visited me. I think I need to look at it again.

Regards

Rob

[Michaelr]

Hi Rob,

With problems like this it might be best to disconnect the HT from the various stages of the receiver, Rf, IF and Detector and Audio. Now starting from the Audio stage reconnect the HT and note the level of Hum. If it is at an acceptable level move forward to the preceding stage usually the last IF and ensure reconnect of ht to this stage as well and note the new level of hum , I am sure you get the drift . Just work your way to the front of the set.

This at the very least may indicate physically where the issue may be.

There so many things that could give you these symptoms you need to isolate the problem a little more.

I must say that I do think the UL41 could be an issue a good tester should indicate internal shorts and also isolation issues.

Mike