OTL Asylum

Sorry no, its designed in distortion numbers are quite poor

180.200.153.59

This Post Has Been Edited by the Author

In Reply to: RE: in most usage where the dissipation is low 6CG7s should sound just like a 6SN7 posted by Blackdog on October 17, 2015 at 16:03:09

If you hsve read the data sheets you ought to have noticed that.
Viz. http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=259993
http://www.audioasylum.com/audio/tubes/messages/26/262921.html
http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=264422
http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=264409
http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=260468
When used as a cathode or concertina phase splitter they are all but blameless, but that's with 100% local negative feedback.
Do a bit of digging and I'm reasonably sure you will find that the 12AU7 does have RF antecedents.
When I first got into audio - as an idea - it was via getting to know recording engineers for our national broadcaster - down here in Aus. - who would often record the cathedral choir I sang in, with just one single-capsule stereo-mike. I was a tween at the time.
Valves ruled back then, and DIY too, and I don't recall anyone telling me how wonderful a 12AU7 was as a gain valve. All who commented said what I am saying.
It is/was used by mfrs because its current draw is low and thus the PT doesn't have to be so expensive.
Nevertheless this is a perfectionist hobby, and keeping overall/total NFB down is a pretty good idea, no?
But, using a 12AU7 for gain duties means extra NFB.
My current (version 10) pre-amp uses a 12AU7 at the output, it's a selected Brimar 13D5 but it's in CF line-driver role. Good economical choice.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

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Edits: 10/17/15

Follow Ups:

RE: Sorry no, its designed in distortion numbers are quite poor - Blackdog 20:41:11 10/17/15 (0)