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In Reply to: approching triode operation with pentode power posted by Ralph on March 19, 2007 at 11:17:03:
I wonder if that's its main flaw - being neither one thing nor the other? The people who complain about UL may be those who are keen on either triode or pentode; either way, they might find UL not satisfying enough.
Follow Ups:
My only question is why would U/L flaws be any different than the flaws of triode or pentode operation? All modes have flaws, so it's a matter of selecting the mode that works best for you.Ray, I think your second sentence is spot-on. I think the basis of most of the arguments here are "my favorite output stage is better than your favorite output stage". There's nothing wrong with that - albeit I think an open mind is a good thing to have.
For the record, my "McShane" amp uses a triode wired output stage. One of my very favorite amps out there is the little Citation V - it's a pentode design. And the killer Citation II is U/L, and I love it too. They all sound great, regardless of the configuration of the outputs.
The Citation II is way more amp than the Citation V (IMO); arguably the best of the vintage amplifiers, although the Citation V output transformer is no slouch!IMO (again) the UL approach, if you have to use pentodes, is a pretty good way to go. I like to cathode cross-couple them- then the distortion gets low enough you can run the driver with zero feedback.
However if you have triodes then the game is over- nothing beats them.
Hello Ralph!It's an honor to "meet" you!
I just wanted to mention that the little Cit V realy responds well to some TLC. Once the power supply (especially the screen supply) gets upgraded it's an amazing amp. I have had a couple here I redid for people I really didn't want to let go of. They were just astoundingly good.
Of course, since they use a pentode ouput stage, the improved screen supply is a big help.
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