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'Turbo' Western Electric 91 amp question...

Posted by gilmorneau (A) on June 18, 2016 at 17:47:56

So I'm thinking of building an amp based loosely on the Western Electric 91 circuit, but with a cathode follower driver stage between the pentode input tube and the 300B output tube.

There are a couple of examples of this out there, one being the DIY HiFi Lux, as discussed here:

http://db.audioasylum.com/mhtml/m.html?forum=tubediy&n=178606&highlight=91+thorsten+thorsten&r=&search_url=%2Fcgi%2Fsearch.mpl%3FForumSelect%3DSelected%26searchtext%3Dthreshold%26

And another being Pete Millett's R120 amp as discussed here:

http://www.pmillett.com/r120_se_amp.html

Very similar idea, but look closely and you'll see that one has the CF direct-coupled to the output tube, while the other has the input pentode direct-coupled to the CF. There are certainly other differences, of course, but I'm curious if anyone has any opinions on why putting the direct coupling in one location or the other would be better and why.

If Thorsten or Pete are looking in, I'd be interested to hear their respective takes on the question.

TIA

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