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Old 16th December 2011, 06:34 PM   #31
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Join Date: Apr 2003
Location: West Yorkshire, UK.
I don't think it's the valves you have to worry about : it's that little power supply circuit board with the relay on it where things go wrong.
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Old 16th December 2011, 08:53 PM   #32
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Join Date: Jan 2008
Location: Bountiful, You-Taw
The newest version.... the 828A does not have the relays on the power supply board...
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Old 21st December 2011, 10:55 AM   #33
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Join Date: Jan 2011
well, my amp i doing it again...

this time the left gu29 red plated on the inside half of the tube. no bad smell or anything. it has run for a few 100 hour since it did it last time, but once again at low volume and for no apparent reason it has done it again,

there is obviously something wrong with it and i don't have the expertise to fix it i can look at a schematic and what out what is what but i don't like my chances of finding a fault unless there is a visably damaged component like last time.

has anyone else had the power tubes red plate and what was the cause?

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Old 21st December 2011, 10:54 PM   #34
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Join Date: Jan 2008
Location: Bountiful, You-Taw
Mine is probably approaching 50 hours of operation now. I lost one 6N1 tube but thats it and replaced them both with Russian tubes. I pulled the Chineese FU-29 tubes in leiu of a pair of RCA JAN 829B tubes that I got on Ebay. I let them burn in for a couple of days and then set the bias to .5 volts grid to ground as instructed. The result is a much smoother sounding amplifier and it has moved me 10 rows closer to the performance. All in all my FU-29 just keeps on ticking and sounding great.

If you keep having problems loosing tubes or with red plates get your self some real tubes.... like GE, RCA or Sylvania. Cetron still makes brand new 829B's. Be sure they are properly biased as it makes a huge difference on sound... Note: I ordered and got a matched quad of GU-29 tubes from Russia. All 4 of them are bad!!

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