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805 linear amplifier??




 
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Author Topic: 805 linear amplifier??  (Read 559 times)
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KE6DF
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« on: August 14, 2021, 10:19:58 PM »

I have a several 805 tubes and wondered if they could be used to build a linear.
 
I know there are many articles around for lineard with a pair of 811a tubes.

Perhaps a grounded grid, cathode driven design with a pair of 805s.

Does this make any sense?

Issues?

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Patrick J. / KD5OEI
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« Reply #1 on: August 18, 2021, 11:33:44 PM »

Well, they have Class B RF amp spec in the tube manual, and also have same modulator specs. Why not?

good datashet with audio and RF class B operating conditions.
https://frank.pocnet.net/sheets/049/8/805.pdf

Would grid lead inductance cause issues with grounded grid service on the higher HF bands for this 1936 tube?
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w7fox
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« Reply #2 on: August 19, 2021, 08:51:43 AM »

Looks like you could get about 100 watts per tube as an amplifier, but it would be easier with 811s in GG.  A pair in class B modulating a pair in class C would make a nice 200 watt AM transmitter.  Don't know the upper freq. it would work at though.
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