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In Reply to: RE: Scott 299B Output tubes glowing Red posted by onekid on May 06, 2016 at 08:43:48
There may be an issue with the tube itself.Did you move it to another socket to see if it moves with it?
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I moved it around and the glow followed in each location. I was however able to set the DC balance very equally with it.
If it glows red in different locations then I guess it's something with that tube.
If your B+ is around 420 VDC at the plate of the outputs try increasing the bias voltage a bit so your reading closer to 24 ma per tube and see if it still glows red.
The 25.4 ma per tube is running them a bit on the hot side and I doubt if you'd hear a difference at 24 ma per tube.
Did you try another set of tubes in the 299B?
Nope not yet. I will try that
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