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In Reply to: RE: Are There Any Issues Using 12au7 in Place of 12ax7s? posted by JimL on April 02, 2016 at 22:34:02
hmm...i dropped in E80CCs in my Vincent SP331 Mk hybrid power amp where orininally 12AU7 should work.
the amp sounds extraordinary much better with the E80CC than it does with any other 12AU7 i tested! (and i tested many, many 12AU7 vintage stuff...).
so i do not longer think, doubt or wonder but just listen and enjoy!
N.
The times, they are changing...
Follow Ups:
The E80CC is a lot closer to a 12au7 than a 12ax7 is.
The E80CC does draw twice the heater current than the 12au7 and that could be a problem.
BTW Thinking is good. Not thinking is bad.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
surely no problem - the amp ist running for months now this way!
any problems should have become manifest right from the start but didnīt.
:))
The times, they are changing...
If it were me I'd be looking to find out the current limits on the filament winding.
The effects of over heating can take a while.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Well, as Tre points out there could be a problem if the heater windings are being stressed by the extra current draw - depends on how much the transformer is over specified. One thing you could do is place your hand on the power transformer after its been running for awhile and see if it is comfortable or too hot to touch. If the latter, you could be stressing the transformer which would shorten its life. Things don't always go bad immediately.
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