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#1
Posted to rec.audio.tubes
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I Don't Believe It
I just tested a EH 12AX7 in the same set up as my last post and it
measured -68dB 2H and -78db 3H. Stage gain was 87. Cheers Ian |
#2
Posted to rec.audio.tubes
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I Don't Believe It
On Nov 3, 5:45�pm, Ian Bell wrote:
I just tested a EH 12AX7 in the same set up as my last post and it measured -68dB 2H and -78db 3H. Stage gain was 87. Cheers Ian Hi RATs and Ian, A person of possibly similar interests published his work and results some time ago in the Japanese magazine, MJ, I think (or confabulate, whatever). Anyway, rather than compare tubes in a fixed circuit, he made changes in the circuit, re-using the same tube. Then, he changed the tube, all single 300B tubes, only, and repeated his search procedures. At the end of an obviously long and meticulous process, he concluded 300B tubes were pretty decent performers... He found he was consistently able to achieve outstanding results, but, the circuit values of that optimal performance changed from one 300B tube to the next. Same mfgr, same production codes, and also other mfgrs, codes, etc. It is obvious we can keep the circuit constant and compare various tubes in it. What is not quite so clear is that we learn anything of value, as listening end users, from that process. Real engineers must design circuits which will not fail, given known specifications of all the components. We may improve an aspect of the performance of those circuits, for a given individual component. These are not similar endeavors. The engineers generally make more money. And, I have known many engineers who honestly enjoyed their work, year in, year out, so - we may or may not have more fun Happy Ears! Al |