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Old 3rd January 2011, 04:08 AM   #21
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Join Date: May 2010
Location: Ball Ground, GA
A, B, & C voltages relate back to the earliest days of vacuum tubes. The "A" voltage is the AC or (sometimes) DC voltage supplied to operate the tube filaments (nowadays, heaters). The "B" voltage is the high voltage DC required to operate the plates and (possibly) screen grids of the tubes, and the "C" voltage is the negative DC voltage required to bias the control grid negative with respect to the cathode to control quiescent current flow through the tubes. The + or - after each letter refers to which side of the DC supply being referred to. These days, the most often referred to supply is the B+ supply (B- being ground) used to provide high voltage throughout the amplifier.

Dave
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Old 3rd January 2011, 08:16 AM   #22
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Join Date: Dec 2010
LOL Dave thanks. I think once I get this fixed I'll stick with my printing press
But I do want to seriously thank the nice people here who graciously answered a "noob" questions in a manner he could understand.

I'll let ya know how I make out once I get my part. Hopefully once it's installed that tube will get "damn good and hot!"
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Old 7th January 2011, 06:45 PM   #23
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Houston we have Reverb! Thanks all..... Ohh man is that 12AT7 tube hot now! Whoop Whoop!
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Old 7th January 2011, 08:57 PM   #24
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Join Date: May 2010
Location: Ball Ground, GA
So happy you got it going Jim -- and hopefully, you learned a few simple things along the way to help diagnose future problems. Good luck the with amp.

Dave
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