Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ]

Re: Haven't tried it but I've a theory that ...

hello, you are wrong with the high distortion of pentodes. Pentodes are very linear, compared at equal output voltage.

But you are right with your experience. I have made many experiments with pentodes and triodes. The best results I have with combining one of both, with local feedback between both tubes.
In my Darling project (schematic is here: http://www.roehrentechnik.de/html/darling.html )I use your configuration pentode-triode, and it sounds much better than triode driver, compared with the same output tube, OPT and speaker.

Combination of triode with pentode allows to work with only 2 tubes, married to one supertube because the local feedback, with high gain and low output resistance. And the distortions are similar to a triode, also if I use a triode driver with output pentode.
My theory says, there is 1 stage with high gain and no interesting sound and 1 stage with beautiful triode sound, but low gain. And combining this both tubes gives the characteristic of the tube with low gain. And this is the triode with dominant 2nd harmonics.
My last project was this combination in push-pull-configuration with cancelling 2nd harmonics in the OPT. (schematic: http://www.roehrentechnik.de/html/2a3-pp.html).


Gerd

This post is made possible by the generous support of people like you and our sponsors:
  The Cable Cooker  

Follow Ups Full Thread
Follow Ups
You can not post to an archived thread.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]