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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: triode EL34 and true triodes posted by zarniwoop on August 13, 2002 at 14:02:00:
A beam tetrode 6CA7 lacks the suppressor grid; there is no such thing as an EL34/6CA7 without the screens and either a beam forming element or a suppressor grid. EL34s are pentodes and by definition cannot lack these. You can use a 2 watt 100 ohm resistor and tie the screens to the plate, and I believe the suppressor is not normally connected anyway. The EL34 is the best non-triode for converting to use as a triode as it is very efficient and easy to drive. However, it is my firm opinion that a pentode should remain a pentode, just as horses should not be painted black and white to make zebras. This is an unpopular view; I used to think that triode strapping was great, but as I learned more about power supply design I realized that the reason many dislike pentodes is because they need a very "tight" DC supply to sound good. I'd do it right and get a TJ mesh 300B, or even a JJ 300B. Chris
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Follow Ups
- Re: triode EL34 and true triodes - Chris Spafford 17:56:53 08/13/02 (9)
- Re: triode EL34 and true triodes - Chris Spafford 12:03:46 08/14/02 (3)
- Re: 300b's - Oscillatus 18:16:46 08/14/02 (2)
- Re: 300b's - vintageguy 04:26:18 08/15/02 (0)
- Re: 300b's - Pär 00:00:29 08/15/02 (0)
- Re: triode EL34 and true triodes - Richard CWY 19:53:56 08/13/02 (4)
- Re: triode EL34 and true triodes - Pär 22:27:57 08/13/02 (3)
- Re: triode EL34 and true triodes - Eli Duttman 01:48:31 08/14/02 (0)
- Re: agree on screen supply - Oscillatus 00:39:24 08/14/02 (1)
- Re: agree on screen supply - Pär 00:42:20 08/14/02 (0)
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