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.

When used as a cathode or concertina phase splitter they are all but blameless, but that's with 100% local negative feedback.

Viz. http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=259993

http://www.audioasylum.com/cgi/t.mpl?f=tubes&m=264375

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

Okay?

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 is Aus. - who would often record the cathedral choir I sang in. I was a tween at the time.

Valves rule back then, and I don't recall anyone telling me how wonderful a 12AU7 was as a gain valve. Most who did comment said what I am saying

It is/was used by mfrs because its current draw is low and thus the PT iron doesn't have to be so expensive.

Plus, keeping overall/total NFB down is a pretty good idea, no?

But, using a 12AU7 for gain duties means extra NFB.

My pre-amp does use 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

Follow Ups: