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Gasey 572B tube.




 
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Author Topic: Gasey 572B tube.  (Read 589 times)
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Knightt150
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« on: August 05, 2018, 10:23:43 PM »

Hello: I just installed two new TAYLOR 572.B's in my amplifier, when I turned on the high voltage one of the tubes had patches of blue haze near the top of the tube the other tube was clear. The amp worked great no problem. Dose this mean the tube is gasey or leaky? I hate to tear it down and send the tube back it's part of a matched pair.

John W9BFO
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w4bfs
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« Reply #1 on: August 06, 2018, 11:17:47 AM »

was the blue a pure or pastel color ?     was the blue between the plate and the glass or inside the plate to the grid ?  it matters for it describes what is going on here
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Knightt150
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« Reply #2 on: August 06, 2018, 09:34:31 PM »

Hello: Thanks for the comeback the BLUE was bright and only on the inside glass, not near the elements, mostly near the top of the tube. The tube is mounted horizontal in the amp and I could only see it under the glass at the top.

John W9BFO
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k4pf
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« Reply #3 on: August 06, 2018, 11:46:13 PM »


A blue glow on the inner surface of the envelope is called fluorescence, caused by the electron
beam hitting the glass. It is not due to gas, and in fact is an indicator of a hard vacuum
within the tube, the opposite of a "gassy" tube.

A glow between the active elements of a tube is an indicator of gas.

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Knightt150
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« Reply #4 on: August 07, 2018, 10:20:10 PM »

Hello: Thanks for the reply I have learned something about gassy tubes or non gassy tubes.

John W9BFO
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Tom W2ILA
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« Reply #5 on: August 12, 2018, 08:36:00 PM »

Im curious to know how those tubes are working.  There have been reports of quality problems with the Chinese 572b's coming in batches.
The old SB200 tubes are getting a bit soft.

Tom
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