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In Reply to: RE: What is the break in time for an output tube? posted by airtime on October 30, 2014 at 06:21:29
I maintain that much/most of "break-in" is the listener adjusting to the tone of the new tube. Especially if the old tube was tonally different than the new tube it can take a while to become accustomed to them.
Yes, there is some change in tube performance, but it depends on the tube, on the circuit it is used in, etc. I find that by about 25 hours or so the tube is sounding pretty much how it's going to sound for the rest of its service life.
There's no special procedures to follow - just plug thew tube in, enjoy the music, and you may hear some changes in the tone.
DO check the bias if you have adjustable bias though - at 25 hours or so I've checked it a couple times if it's me, just to be safe.
Follow Ups:
Jim;
Regarding tube break in time; I wanted to let you know that the matched quad of EH 7591's arrived today along with the Russian K40 pio caps, and 200k grid resistors. The Fisher 500c sounds stupendous.......Immediately!
The power transformer was only slightly warm, and the output transformers were barley warm after a hour and a half of spirited playing.
Here are a couple of before and after pics. Those k40 caps are H-U-G-E compared to the tiny Illinois caps they replaced.
Thanks for the great parts and fast service!
I was a vegetarian for 15 minutes, until the main course.......Meat; It's the right thing to do. Romans 14:2
Past that, however, not so much. Fresh new output transformers can take a while to break in.
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