• 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.

What happens when Output transformer max voltage (slightly) exceeded?

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trobbins

trobbins

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Joined 2009
dalmura.com.au/projects/amplifier.php
wa2ise said:
A possible workaround: change the power supply in such a way to create a negative few hundred volts, and a few hundred positive volts. Run the output tube's cathode circuit off the negative supply, and the OPT off the positive few hundred volts. The tube will see the 1130 or so volts of supply, but the insulation in the OPT will only see around half that, well within the spec. To drive the output tube you'll need a higher than usual voltage rated coupling cap.
Click to expand...

Perhaps not a great idea in practise. 0V reference for testing is now a large negative value, which risks causing damage or shock in the future. The peak stress to core or secondary (assuming they're earthed) is only alleviated by a few hundred volts, which is relatively a minor improvement with respect to the flying voltage experienced with a cut-off tube(s).
 
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