[morzh]

I put it back together one more time, and thought I'd be done.

However the sound is not very good. And there is some hum from the speaker, which I think is responsible for the quality of sound. It is a low grade hum, not corelating with the volume. And it even exists, to a smaller but comparable degree, when the audio tube is yanked. I think it is the ripple through the field coil. And I am not sure the speaker has the humbucking coil.

The capacitors are good; the 1st one is 8uF Solen film, the second is a good grade 10uF electrolytic. I tried to bump up the second cap's value by paralleling a 20uF very good cap, to no change whatsoever.

I am starting to think this might be a norm.

The problem with a low grade hum is, it gets amplified by the cabinet; I had the same problem with my Philco 87. It can be barely heard with the speaker on the bench, but put it in the cabinet, and voila!


PS. Found this thread on ARF

https://antiqueradios.com/forums/viewtop...5#p3547115


Confirms my suspicions.