In Reply to: RE: Pentode vs. Ultra Linear posted by Freo-1 on April 19, 2015 at 10:54:06:
" He explained that when the plate pulls the top of the output transformer winding towards ground, the ultra-linear tap pushes the screen grid so low that it renders the tube unable to drive difficult loads...."
Winding an OPT with the tap in a reasonable spot takes care of that on amps with HP-race B+ levels. It is a matter of tube choice and OPT design...IOW, U-L amp building 101...which I am pretty sure he did well in, which means what coming from a good designer? surely not, "I screwed up the design"?
It is easier to crank up the g2 voltage on a pentode so the loadline stays where the plate curves are horizontal no matter what the speakers do.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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Follow Ups
- RE: Pentode vs. Ultra Linear - PakProtector 18:02:05 04/19/15 (15)
- I think one needs to take that quote with a big grain of salt... - Steve O 20:45:21 04/19/15 (14)
- sounds like the Carver that we know and love - richardl 14:03:02 04/20/15 (0)
- You mean these? - Michael Samra 02:47:05 04/20/15 (2)
- RE: You mean these? - autospecialty 17:55:17 10/28/18 (0)
- That's it! (nt) - Steve O 05:19:13 04/20/15 (0)
- RE: I think one needs to take that quote with a big grain of salt... - unclestu 21:17:17 04/19/15 (9)
- What was the timeline for this work? - Triode_Kingdom 05:45:44 04/20/15 (2)
- Late 80s-early 90s... - Steve O 06:34:39 04/20/15 (1)
- RE: Late 80s-early 90s... - Triode_Kingdom 07:43:02 04/20/15 (0)
- RE: I think one needs to take that quote with a big grain of salt... - mqracing 00:53:55 04/20/15 (3)
- PS never worked on a Mk VI - unclestu 02:58:08 04/20/15 (0)
- Whoa !!! - unclestu 02:52:59 04/20/15 (1)
- and.... - PakProtector 10:37:20 04/21/15 (0)
- RE: I think one needs to take that quote with a big grain of salt... - Steve O 21:56:57 04/19/15 (1)
- LOL!! - unclestu 22:41:29 04/19/15 (0)