6EJ7 or 6EH7 triode strapped?

kegger · 21st November 2006, 07:01 PM

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.

leadbelly · 21st November 2006, 07:03 PM

Look here:

http://www.diyaudio.com/forums/showt...113#post550113

kegger · 21st November 2006, 07:23 PM

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?

leadbelly · 21st November 2006, 09:34 PM

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.

kegger · 22nd November 2006, 01:02 AM

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)

wrenchone · 22nd November 2006, 01:28 AM

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.

Tubes4e4 · 22nd November 2006, 05:23 AM

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

kegger · 22nd November 2006, 05:30 AM

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.

Tubes4e4 · 22nd November 2006, 05:52 AM

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 µ=10, gm=5mA/V, rp=2k.

Triode strapped plate curves here.

Tom

kegger · 22nd November 2006, 05:58 AM

Thanks, that's the closest so far as to what I'm after.

21st November 2006, 07:01 PM	#1
kegger diyAudio Member Join Date: May 2004 Location: michigan	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.

21st November 2006, 07:03 PM	#2
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Look here: http://www.diyaudio.com/forums/showt...113#post550113 __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

21st November 2006, 07:23 PM	#3
kegger diyAudio Member Join Date: May 2004 Location: michigan	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?

21st November 2006, 09:34 PM	#4
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	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. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

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22nd November 2006, 01:02 AM	#5
kegger diyAudio Member Join Date: May 2004 Location: michigan	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)

22nd November 2006, 01:28 AM	#6
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	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.

22nd November 2006, 05:30 AM	#8
kegger diyAudio Member Join Date: May 2004 Location: michigan	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.

22nd November 2006, 05:58 AM	#10
kegger diyAudio Member Join Date: May 2004 Location: michigan	Thanks, that's the closest so far as to what I'm after.

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