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In Reply to: Re: Non-match power tubes posted by steve o on July 22, 2002 at 16:20:57:
Steve,Ever find a set of tubes, in which the grids age differently from one another? To the point of detriment and possible injury to the amp?
Follow Ups:
Not sure what you mean by "grids age differently". I have used pairs of TUBES that were well matched to start but after extensive use were somewhat unmatched although not to the point damaging an amp (unless you count sudden and catastrophic failure as aging). In all cases of aging or sudden failure I've beeen able to shut things down before serious damage occurs (nothing more than replacing screen stopper resistor and so on). Note that my tube stuff is mostly vintage and I DO NOT leave it on 24-7. If I can't get to it in 30 sec or less I turn it off.
Steve,I guess I meant if you've noticed certain tubes which the grids age differently---thus giving different internal resistance, etc, from one another as they age.
Not just the cathode and anode, but the suppressor, control, and screen grids. I never really thought much about variance, with age, among these grids and the effect on overall performance.
Guess I've never thought about tube aging in quite that manner i.e. the "grids" somehow changing over time. I've always looked at a tube as an overall system although my understanding of the wearout mechanism is: reduced cathode emission, gas/loss of vacuum or some combination of the two.
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