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-   -   How hot are they supposed to get? (http://www.diyaudio.com/forums/tubes-valves/53901-how-hot-they-supposed-get.html)

leadbelly 20th March 2005 07:49 PM

How hot are they supposed to get?
 
So how hot are my tubes (6922) supposed to get? This preamp here:
http://www.diyaudio.com/forums/showt...590#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?

SY 20th March 2005 07:51 PM

That sounds like the envelope is on the cool side, if anything, maybe 60C or so.

leadbelly 20th March 2005 08:32 PM

Quote:

Originally posted by SY
That sounds like the envelope is on the cool side, if anything, maybe 60C or so.
Woo-hoo! Thanks!


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