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Driver for a 807 em triode mode...help !!!
Driver for a 807 em triode mode...help !!!
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Old 3rd October 2011, 09:54 PM   #1
aldovan is offline aldovan  Brazil
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Default Driver for a 807 em triode mode...help !!!

Friends

To excite a 807 in single-ended triode mode is best to use a preamplifier tube with low plate current or large plate current to compensate the capacitance of the grid ?

Thanks,

Aldovan
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Old 3rd October 2011, 09:56 PM   #2
aardvarkash10 is offline aardvarkash10  New Zealand
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bigger is always better.
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Old 3rd October 2011, 10:00 PM   #3
aldovan is offline aldovan  Brazil
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Default 807

Quote:
Originally Posted by aardvarkash10 View Post
bigger is always better.
Thanks.
Them I will put a medium power pentode in triode mode as driver.
A El84 is fine ?

Aldovan
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Old 3rd October 2011, 11:06 PM   #4
aardvarkash10 is offline aardvarkash10  New Zealand
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absolutely fine - probably overkill.

Alternatively, PowerDrive it, ie use a MOSFET as a follower to drive the 807 grid.
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Old 3rd October 2011, 11:08 PM   #5
aldovan is offline aldovan  Brazil
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Default Mosfet ?

Quote:
Originally Posted by aardvarkash10 View Post
absolutely fine - probably overkill.

Alternatively, PowerDrive it, ie use a MOSFET as a follower to drive the 807 grid.

Mosfet ? Blargh, Mosfet is trash !
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Old 4th October 2011, 02:28 PM   #6
boywonder is offline boywonder  United States
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Default MOSFET follies and powerdrive

Aldovan: Here are a few links well worth the read........

http://www.geofex.com/Article_Folder...osfetfolly.htm

PowerDrive
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Old 4th October 2011, 05:56 PM   #7
flatheadmurre is offline flatheadmurre  Sweden
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A have a stash of C3g usually works when other fails !!
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Old 4th October 2011, 06:15 PM   #8
artosalo is offline artosalo  Finland
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Triode connected 807 is not very difficult load since its mu is low, about 10.
Thus the Miller effect is not remarkable.

Any medium mu triode is suitable driver.
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