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Just a guesstimate. How long should it take to properly break in an output tube?
I just got some new ones for my sherwood. They sound great but lack some of the background detail. However I only have an hour on them.
charles
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Charles
Two things..Number one,did you reset the bias? You do this by moving the slide switch in the back to test position.You have two controls next to that switch that looks like one control but it's actually two..Adjust for lowest hum possible in each channel with each pot and then move the switch back to normal position...There is break in time on new tubes and things will smooth out because you won't have such dramatic peaks and dips in power bandwidth response and it will liven up because power and distortion will be much more consistent.
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Edits: 10/30/14
Let the tubes burn in for a few more hours. Then I did the HUM check with a multimeter. They sound great.
more force on the top and bottom end. Cleaner sounding. But they don't have that midrange Punch the Phillips had. But this is like trying to say what color you want that Ferrari in????
When ever you try to describe or compare something in audio I always fell like it's coming out like I'm bashing something. I'm not!! They both sound great!!
Thanks Jim and Mike.
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.
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.
25s ( until it's hot)
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