How do you warm up your tube amp for a listening session?
Jan 18, 2009 at 4:07 AM Thread Starter Post #1 of 49

peanuthead

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Sorry for my noobness, but how do you guys warm up your tube amps for a serious listening session? Is it enough to just turn it on for 20-30 minutes, or do you have to have a heaphone plugged in and music playing? Thanks.
 
Jan 18, 2009 at 5:24 AM Post #5 of 49

Nick 214

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Quote:

Originally Posted by fatcat28037 /img/forum/go_quote.gif
Turn it on and listen. You won't hear any differenceif it warns up for 20 minutes. If you don't believe this run a test.


I'm going to go ahead and disagree... If your room is cold enough, you'll hear a distinct "ting" as the tubes heat up...
 
Jan 18, 2009 at 6:47 AM Post #6 of 49

goorackerelite

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I would let the tubes warm up for about a minute, then listen seriously.
20 min is just too much in my books.
 
Jan 18, 2009 at 7:15 AM Post #8 of 49

peanuthead

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Quote:

Originally Posted by olblueyez /img/forum/go_quote.gif
20 min to an hour.


Just the amp on or with music playing?
 
Jan 18, 2009 at 8:30 AM Post #10 of 49

rockbottom

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The light on the Melos normally changes color a while after switching on. I'd take that as a good indicator.
 
Jan 18, 2009 at 8:53 AM Post #11 of 49

BigTony

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There is no 'magical' formula, turn on and listen. My amp pings, creaks and moans for a minute or two, pretty much like i do when i wake up.
 
Jan 18, 2009 at 8:56 AM Post #12 of 49

krmathis

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Turn in on, then do something else for 20 minutes before I come back for a listen.
 
Jan 18, 2009 at 9:08 AM Post #13 of 49

xenithon

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I turn on all the gear about 15 minutes prior to listening - I find both sources (CDP's, DACs etc.) and amps benefit from this. Whether it is real or placebo... who knows?
tongue.gif


Please note though it is not just the tubes we are talking about in an amp(also why I believe non-tube devices like SS amps and sources can benefit from warm up too). Transistors and other parts take time to come up to operating temperature and reach their design values; caps take time to recharge after being off for an extended period.

Here is a brief explanation from one Nelson Pass:

Most of these parts, MOSFET and Bipolar, increase their transconductance as they warm up a bit, and their junction drop Vgs or Vbe alters with temperature, so we always do our adjustments and evaluation after they have warmed up for an hour. Over that period of time you can measure very significant performance changes, not to mention any subjective perceptions
 
Jan 18, 2009 at 1:09 PM Post #15 of 49

Spareribs

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For my amp, I usually do not warm up. I just turn on and play. If I am using an RCA 6sn7 tube, I will let it warm up for at least 20 minutes since it seems to take time to get the right sound with my amp.
 

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