There ya go guy's. I told ya... Wow Adam, this set's realy traveled, CA to MI, now residing in IL. This thing's been getting good use on my desk now.
Anyway's if i'm not too busy tomorrow, I plan on opening it up. I'll test the tube and if it tests good/ok, i'll swap it to another spot on the chassis with another 6U8 and go from there. See how it runs and hopefully have it back together that night. If it tests low or the one I intend to swap tests low, ill have to wait for a spare good one to come in the mail.
Quote:
Originally Posted by Phil Nelson
This article has a link to the RCA factory service manual for this model:
http://antiqueradio.org/rca16.htm
It includes disassembly instructions and loads of other info.
As old_coot88 suggested, you can try some tube tapping once you have the chassis out. I doubt that a tube tester will tell you whether a tube is microphonic, but if you find a microphonic 6U8, you could try swapping it with the other 6U8s in the set. A tube that's microphonic in one position (say, RF amp) might work fine in another position. Since the TV was working normally apart from the squeal, I see no reason to replace all of the 6U8s.
My RCA T-100 TV had a thick lead collar around its oscillator tube to prevent microphonics. Nowadays you can buy aftermarket microphonic dampers to fit around tubes. They are collars made of brass, copper, or even plastic.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html |
That's good to know Phil. I was figuring that I could probably swap them around. And I don't have plans to replace all 6U8's but I figure it's good to have a couple in my stash as extra back up. I probably got something else around here that uses them as well...
I've read your article. Very good as well as your other restoration's. Huh, thats very interesting about the "dampers" for these and other select few tube's. May look into them, if they're cheap.