OK, too much confusion so it's time to post these numbers again.

First, of course, you all know that we don't "support" modifications to the products. Nobody does, because nobody can. We DO encourage those who wish to try things, and help out where we can - it's a great hobby!

Under the "helping out" label, I have posted the appropriate resistor value to get 6.3 volts DC from a PT-3 when the input line voltage is 120vRMS. Here are the numbers, current in column 1, resistor in column 2, notes in column 3:

0.3A 1.37ohm

0.6A 0.61ohm (stock FP has 0.62)

0.9A 0.35ohm (stock Extended has 0.62 paralleled with 1.2 equals 0.41ohm)

1.2A 0.22 ohm (stock FP with 6SN7s would use this)

1.5A 0.15ohm (this is what John has)

1.8A 0.10ohm (SEX amp, or eXtended Foreplay with three 6SN7s)

2.1A 0.06ohms (a SEX amp with 6EM7s - though I would just use the 0.1 ohm, it's not that different.)

The formula, which is just a curve fit, is approximately as follows:

V = 7.10