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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: One amp, one type of tube only, no rolling? posted by strhd07 on November 24, 2015 at 16:29:13:
Thanks to all for the replies. Best I can tell, there are at least two things going on here (maybe more): one legit, one not so much. First, it seems the output trannies for some amps are more narrowly specc'd and built for one kind (or many just a couple or three) of tube, something that someone as tech undereducated as me wasn't aware of. A.J. said here in '07, as I found: "Using KT88, KT66 or 6550 would require some changes in the output transformers that being custom and handmade for the EL34 output impedance, seems to me quite unpractical. Other amplifiers using different circuit implementation and not application optimized trannies, can use different tubes."
Second, it seems to be a case of a manufacturer prescribing only one way as far as tubes/operation/associated equipment, etc. go. The irony, as I discovered in poking around, is that the brand of tube the manufacturer says is the only one to use is so bad in current production that Kevin Deal and Jim McShane won't even sell them. Go figger.
Nonetheless, it does seem that some fixed-bias amps are more tolerant than others in the tube-rolling line. It's just that it appears a little less than biblical that only one kind of tube, let alone one brand, has to be used in a particular amp.
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- The princess and the tube pea - strhd07 15:08:59 11/25/15 (0)
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