Quote:
Originally Posted by mstaton
Hum bars are caused by AC voltage getting into the B+. It could be from a bad cap or a shorted filament in a tube(filaments are AC). The hum sound from the speaker is not causing the hum bar on the CRT. You are just hearing the 60 cycle hum through the audio circuit. Don't confuse audio hum and buzz, 2 different things. Buzz will change with the programming and hum will be constant. Yes a new cap can go bad.
Radiotvnut beat me to it!
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Thanks,
I am sure it was a shorted filament in a tube, like you mentioned.
I had the brilliant idea of buying 14 NOS tubes from Ebay for this set a couple weeks ago. I thought with all NOS tubes in there, it would work even better than it already did!
They must not have been NOS, or at least some, cause ever since all I have had are problems.
Today, I put back all the original Admiral tubes one at a time, to test it, and after they were all in, it worked like new again!
I'm out 50 bucks on those tubes, though some may be okay, I really don't know.
I must get a tube tester already, it was foolish of me to gamble like that.
I did buy a Lafayette t-50 a month ago, but I could never get it to work.
I'll have to spend a little more and get something reliable already!