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Old 21st November 2006, 07:01 PM   #1
kegger is offline kegger  United States
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Default 6EJ7 or 6EH7 triode strapped?

I am wondering if by chance does anyone have any 6EJ7 or 6EH7 triode data sheets?
I'm really curious about the plate resistance and gain on these tubes strapped in triode.

I have several of these tubes and was thinking of triode strapping them as drivers.
Thanks for anything anyone may want to share on these particular tubes.
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Old 21st November 2006, 07:03 PM   #2
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Look here:

http://www.diyaudio.com/forums/showt...113#post550113
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Old 21st November 2006, 07:23 PM   #3
kegger is offline kegger  United States
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Default DUH!

Hey thanks for that, didn't think to search as I didn't expect to find it, DOPE!

I was hoping the plate resistance would be a bit lower then that, humm.

Have you built anything with them?
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Old 21st November 2006, 09:34 PM   #4
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Not yet. I have many ideas on how to use 'em. Geek has a 6EJ7 mu follower design on his site. Also, they would great in Gary Pimm's hybrid CCS. That's just SE amps. For PP amps, just putting them in the tail of a long tailed pair would be good.
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Old 22nd November 2006, 01:02 AM   #5
kegger is offline kegger  United States
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I'll try something with them pretty soon myself I'm sure. Thanks.
But I was trying to find some 9pin pentodes to try as triodes that would have really low gain with lowish rp.

I wonder what a 12BY7 in triode is like, humm. Still looking at others I have stashes on to fit the bill nicely.
At the moment I'm running 12B4's and was looking to try some other types in there place, (with tweaking yes)
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Old 22nd November 2006, 01:28 AM   #6
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If you want low gain, a triode strapped 6AQ5/6005 gives you a mu of ~9.5 with an Rp of about 1.9k (from memory - actual numbers may be somewhat different). The hefty half of many of the vertical oscillator/amplifier dual dissimilar triodes will give you a mu of around 6 with an Rp below 1k.
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Old 22nd November 2006, 05:23 AM   #7
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Default Re: 6EJ7 or 6EH7 triode strapped?

Quote:
Originally posted by kegger
I am wondering if by chance does anyone have any 6EJ7 or 6EH7 triode data sheets?
Trioded 6EJ7/EF184 plate curves here..

Tom
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Old 22nd November 2006, 05:30 AM   #8
kegger is offline kegger  United States
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Hey thanks for that, in this ap I need 9pin tubes as I don't want to change out the sockets though.

I may give a 6bq5 a try but I'd like to see lower gain like that of the 6aq5 you mention.

Looking to see if I can find something that ends up somewhere around 2k-4k plate resistance and less then 10mu.
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Old 22nd November 2006, 05:52 AM   #9
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Quote:
Originally posted by kegger
I may give a 6bq5 a try but I'd like to see lower gain like that of the 6aq5 you mention.

Looking to see if I can find something that ends up somewhere around 2k-4k plate resistance and less then 10mu.
6AQ5 is a noval equivalent to 6V6, hence triode strapped parameters should be about =10, gm=5mA/V, rp=2k.

Triode strapped plate curves here.

Tom
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Old 22nd November 2006, 05:58 AM   #10
kegger is offline kegger  United States
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Thanks, that's the closest so far as to what I'm after.
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