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In Reply to: RE: Tubes tested & burned in posted by Byrd69 on February 15, 2017 at 16:11:41
...I've run into a lot of Russian power tubes whose bias was unstable if used out-of-the-box. 24hr burn in at low current stabilized bias for about 90% of them.
Tweaking the bias every 10 minutes during the first 12-24 hours of run-in is part of the fun of owning tube amps.
And then, as a bonus, you might get lucky and find that one of your 'platinum matched' tubes refuses to hold bias even after 48 hours of use and you have to decide on sending back all 4-8 matched tube for replacement or just the one that won't hold bias which. of course, means your 'platinum matched' set is now of a lesser grade of valuable metal.
Like maybe 'brass matched'?
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