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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: QUESTIONS ABOUT TUBES MATCHING ! posted by jug2hurta@yahoo.fr on July 19, 2006 at 18:32:14:
jug2hurta. hi. This is a complex subject. You might do a search on how current tube suppliers/branders match and grade tubes. Mutual Conductance is a norm. Keep in mind that brand new tubes as factory matched will probably change (sometimes in a big way) in a mere few hours of operation. To really test a power tube you need to put the tube under dynamic conditions with appropriate B+. A lot of tube testers don't do this. I probably should say Most Tube Testers don't do this.
Also, power tubes do best when run a bit over time and not sitting in a box. An ancient power tube manufactured in 1928 for example should not be subjected to full power conditions on startup. Rather it should be run gently at first and gradually brought up to full power unless you like playing Russian roulette with irreplaceable antiques. Running the tube aids in cleaning up the interior and makes for a happier tube overall.
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Follow Ups
- a few caveats - elektron 07:04:19 07/20/06 (1)
- Re: a few caveats - jug2hurta@yahoo.fr 19:28:16 07/20/06 (0)
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