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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: RE: New production 6L6/KT66? posted by Triode_Kingdom on March 20, 2015 at 13:19:19:
In addition to feedback and bias, many amplifiers use frequency compensation networks that need to be tweaked when tubes are changed. This all means that the audible effects of tube rolling are really only appropriate for the specific amplifier used to test them
BINGO!
You have to admit that the analyzer has showed you a lot of things we took for granted when we rolled tubes..Even hooking a pentode up in triode is going to change because the tube now has a more linear loadline, lower plate resistance, lower gain, and higher transconductance.The problem is,the amp wasn't designed to run this way so when you take measurements in the Pentode designed amp that is wired as a triode,you will see the distortion go up while open and closed loop gain changes significantly.Distortion almost triples in many cases so tube rolling does have its drawbacks even in the smaller tubes because as you say,the values have to be tweaked when you change tubes.
We often hear people say,I put these different number tubes in my amp or preamp and I was floored by results and to their ears that may be the case however,the changes they are hearing may be a rise or dip in frequency response at different parts of the spectrum or maybe a different distortion number..Once they see this behavior on an analyzer,they don't seem to like that tube(s) anymore..Funny how that works..
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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Follow Ups
- RE: New production 6L6/KT66? - Michael Samra 03/20/1515:12:24 03/20/15 (0)
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