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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: DHT drived by a fet posted by Antonio Tucci on March 30, 2006 at 20:17:04:
A FET will have low output impedance, so it can drive anything.
I think the biggest problem is going to be the high gain of FET amp
stage as well as the V(source,drain) limits of most devices out there. If you are driving a Class A1 triode, you might need to swing 200V. However, for an A1 triode, you dont really need the super low Zout of a fet.I think the best application would be a FET follower driving the
grid of a Class A2 transmitter triode... I'm thinking of stuff like
the 805, 811a, 572b, the big Eimac's. Those tubes might only need
60V of swing, but require a very low driving impedance and power sinking to absorb the grid current...As far as cathode drive, the cathode is going to have very low Zin, so a FET is probably the only think with even lower Zout to drive it. You are talking about grounded grid right? Seems like an invitation to battle RF problems...
-- Jim
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Follow Ups
- you sure can.... - Jim Doyle 21:35:44 03/30/06 (6)
- Re: you sure can.... - Antonio Tucci 05:58:25 03/31/06 (0)
- "spud" triode? - BofService 05:41:30 03/31/06 (3)
- Re: "spud" triode? - Antonio Tucci 06:06:47 03/31/06 (2)
- Re: "spud" triode? - Thorsten 08:01:29 03/31/06 (1)
- Re: "spud" triode? - Antonio Tucci 20:24:55 03/31/06 (0)
- Re: you sure can.... - John Swenson 22:40:13 03/30/06 (0)
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