• 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.

AC or DC heathing?

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Disabled Account
Joined 2010
Just for interest,

Ambient temp in your area / room can change the inrush current on heaters. Just one of my experiences. Playing with 12AX7 struggled to get Lm reg to start so put in a resistor that only just got it up and running (sun shining on my project) with a shorting relay this was tried with new cold tubes so no residual heat from start. Next morning- would not start had to alter the time and resistance value! My point is the warmer the tube from ambient the easier it is to start.

Regards
M. Gregg
 
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