• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Stereo build- Mikael Abdellah's KT88 SE amp

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arold19

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Joined 2002
I use this amplifier since a couple of year now with a low fillament voltage of 5.7V since the 6.3V specification... Do you think it is a good idea to correct that problem? First of all, my power transformer have 3 output of 6.3, I use one output for each tube! I have 119.5V from the wall... The DC output is 400V dc... When I try the 110V input (tap) of the transformer, I have 6.4V to the filament and 440V supply so. Can I run this amplifier at this high voltage without any problem? 6.4 is a little bit high? I can put resistor to drop that voltage? Can I add a resistor to drop to 400v?
Thank you!
It is a good idea to put 2 X 100 ohm resistor directly at the output of the power transformer?

 
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