Was playing around with an infrared thermometer...

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

the other day and decided to take a few readings of the tubes in my M60s (the long chassis type like the prior style MA-1s). I found that, typically, temps were about 50 degrees higher at the tops of the tubes than just above the base and that the outer bank of tubes away from the transformer cover were also at least 50 degrees cooler. These comments both pertain to the 6AS7s, of course. The "middle" tubes in the two banks of four 6AS7s tended to be as much as 70 degrees hotter than the ones on the ends. 6AS7 temps ranged from about 270 degrees to as much as 340 degrees.

V1 ran about 210 degrees, V2 is shorted, V3 ran about 180ish and V4 about 160 or so.

DC offset and bias were both adjusted immediately prior to the taken readings.

Just thought enquiring minds might want to know.

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K&K Audio / Lundahl Transformers

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Topic - Was playing around with an infrared thermometer... - acres verde 12:06:47 02/04/17 (3)

Fahrenheit or Centigrade? - Lew 14:55:09 02/04/17 (2)

RE: Fahrenheit or Centigrade? - acres verde 09:38:19 02/06/17 (1)

So, our temp measurements are in near exact agreement... - Lew 10:31:43 02/06/17 (0)

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