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In Reply to: RE: Review of replacing a 7199 with a E80CF posted by airtime on July 22, 2017 at 07:35:03
they're the drivers for the OPT tubes?
EMWTKnow.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Follow Ups:
So why should I do both?
Ahhhhh just bustin ya. Of course I did both. If I had a few extra bucks kicking around I would try rolling some other 6U8's and 6BL8's.
If you ever get around to trying 6u8's I have a bunch of them, various brands, advertised and tested NOS, you are welcome to try. I ended up with them for a Scott tuner, used as a mixer. I would change it, and it would get more difficult to tune after a month or so. I kept trying different tubes, brands etc., finally read a posting that said have to use 6u8a in that application. It doesn't make sense because the only difference is supposed to be heater is slower to come to temp, but the poster was sure right. Put in a 6u8a never had the problem again.
But to the fact that the replacements are more up to the job than the ageing 7199s were, by the time you noticed the problems.I'd be inclined to bet on it.
Which is very probably the same as with the 7199s when they were still up to the job. Unless of course the new passive components surrounding each tube - so that they do the job of splitter driver properly for the circuit - are in better nick than the passive bits which were around the 7199s you replaced.
:-)!
Glad you are happy with the sound. Did you buy some more pairs of the E80CF? I would.
Note that in my old review (under Reviews here) of the rebuild of my LEAK St20s, I assumed that it's the changes - not the renewal - that drove the improvements, that were obvious. While a bigger, quieter PSU is an established plus, lower mu high GM splitter drivers might not be.I am not going to do DBTs on each change. ;-)
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/22/17 07/22/17 07/22/17 07/22/17
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