How hot are they supposed to get?

leadbelly · 20th March 2005, 06:49 PM

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, 06:51 PM

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

leadbelly · 20th March 2005, 07:32 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!

20th March 2005, 06:49 PM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	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? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

20th March 2005, 06:51 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	That sounds like the envelope is on the cool side, if anything, maybe 60C or so. __________________ If there's a sucker born every minute, where do the rest of them come from?

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