• 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.

How hot are they supposed to get?

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So how hot are my tubes (6922) supposed to get? This preamp here:
http://www.diyaudio.com/forums/showthread.php?postid=601590#post601590

Right now they are hot but I can still touch them with my bare fingers for a few seconds. I am a little paranoid because on my LM317 heater supply I used 3 x 12 ohm resistors in parallel, which works out to a little more than the 300 mA in the tube specs. Is this OK?
 
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