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In Reply to: RE: Philips ECG 5AR4 (miss-labeled 5V4GA) posted by FenderLover on July 12, 2016 at 11:37:40
Steve
Those may not be mislabeled The 5V4 are both indirectly heated filaments and if you check the output B+,that might show you the difference.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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B+ voltages are similar as Mullard GZ34 or Sylvania 5AR4. Structure is way different than a 5V4GA.Bias current on output tubes fall into 5AR4/GZ34 range. These tubes have no sag, like other tubes.
Edits: 07/12/16
They are for sure 5ar4's. I have a stash. I got them when they were still cheapish. Great tubes.
I think the situation "parallels" that with what Sylvania did to fulfill a 6B4G contract, by internally triode wiring 6AV5Gs. Other than a slightly lower forward drop, a 5AR4 drops right into a socket intended to take a 5V4. Things easily could have been "close enough for government work".The picture posted sure shows what looks like a JAN box.
This time around, the tube end user community got a bonus. :> )
Eli D.
Edits: 07/13/16
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