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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Pentode vs. Ultra Linear posted by krankkall on April 19, 2015 at 09:39:49:
With the 6883B amp, I had separate windings from the power transformer for the screens. Six of one, half dozen of the other, from a cost perspective.My major reason for going pentode is that provides more flexibility regarding the choice of output tubes. The other reason was stated earlier:
" 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. In addition, he pointed out that the normal idle potential on the screen grid regularly exceeded a safe voltage, often causing output tubes to blow up. The tube manufacturers hated it, but had to go along or lose market share, and so changed the specification for screen voltage in order to allow ultra-linear output stages. I wonder if they changed the tube design, or just changed the screen voltage specification."
Good enough for Mr. Hegman is good enough for me. :-)
BTW: The 6146 was successfully used for audio applications as early as 1952. It is a good linear tube for audio.
" Don't look back. Something may be gaining on you"
Satchel Paige
Edits: 04/19/15
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Follow Ups
- RE: Pentode vs. Ultra Linear - Freo-1 10:54:06 04/19/15 (18)
- 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)
- RE: Pentode vs. Ultra Linear - Triode_Kingdom 13:57:36 04/19/15 (1)
- 6146/6883B is very linear... - Freo-1 14:34:13 04/19/15 (0)
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