• 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.

PSU2 and power transformer question.

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I was playing around with the Duncan Amps PSU2 software and had a question on the power transformer part. It asks for volts in RMS and was wondering how do I calculate that value. Say I have a PT of 550VCT. This could also be expressed as 275-0-275. Do I use 550*.707 or 275*.707, or is 550 or 275 already spec'd in RMS. Or am I way off here? TIA...
 
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