Pulling Hair With Zenith Transoceanic 6T40!!!

[Tubejunke]

Originally Posted by Electronic M

I would not have used a selenium to replace a selenium.....Too high a chance of replacing a bad part with a bad part or even a good part with a bad one.

Yeah, it was a bit of a hasty move, but I simply used what I had on hand. Thus far I have never removed a good selenium just to pop in a modern silicon diode and whatever resistance is needed.

On Squirrel Boy's advice I checked everything he mentioned and came up still missing about 40V at the output of the rectifier. Here is where better troubleshooting and/or better equipment comes into play. Following the power supply circuitry I double checked the remaining .047mfd 600VDC bumblebee that I was stupid enough to leave in as it tested no leakage under load last week. Now there was strong leakage at about 100V. I replaced that reluctantly as I had the other with the last of my equivalent value @ 1Kv. They were for a 40s RCA TV that I have, but oh well for now.

I was still missing the voltage! So next up the line of fire was the 60mfd section of the multi section lytic. All I had was an 80mfd so I jumped that in and my 100V at the output of the rectifier was there; and then some. Still never a sound out of that old speaker!! I need to get a cap that is the right value first off as I know from reading at least that these sets are more critical on voltage tolerance than a plain A5.

But next I will test what was a good tube compliment. I hope still so, butt through getting out bad caps I saw the filaments glowing in a lit room and that's not good for 1.4V tubes. Maybe I will get lucky and find maybe one bad one which would be enough to keep the set silent.