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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 14th July 2019, 04:42 AM   #1
ASRMX1 is offline ASRMX1  Mexico
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Default Tubelab SE, one tube runs hotter than the other

Please Help,


I finished TSE with 300B. The filament voltage is 4.88 and 4.90. I get sound from both speakers, however the output tubes runs cool, and left channel have distortion. The tepmerature is about 50 celcius in left chanel and near to 80 celcius in right. The right channel sounds very well. I swap output tubes, transformer as well and input tubes and the left channel have distortion.



In advance for your help, thanks.
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Old 16th July 2019, 10:07 PM   #2
w5jag is offline w5jag  United States
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What is the plate current in the left tube?

If the left tube is not getting as hot as the right tube, the left tube may not be drawing current.

The problem in the left side could be that the bias is set incorrectly, or a bad MOSFET on that side.
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Old 17th July 2019, 12:07 AM   #3
ASRMX1 is offline ASRMX1  Mexico
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Thanks W5JAG. I'm a newby. Sorry if not explain myself.
I checked again all parameters, plate voltages and bias. I found the left channel channel bias was quite low. Then I adjusted again and bingo! Now is sounding quite fine. Sounds beautiful.
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