Nice triode

revintage · 25th January 2010, 11:24 AM

Found this one when poking around. It is available but on the border to unobtainium. Ri=2k, mu=30, S=14. Curves look nice I think.

barretter · 25th January 2010, 12:28 PM

And it will remain unobtainable for the rest of us as you haven't told us its name.

SY · 25th January 2010, 12:32 PM

Looks like one of the Russian ECC88 variants. You could get pretty similar curves (maybe a little higher gm) by paralleling two "normal" ECC88 sections.

barretter · 25th January 2010, 12:39 PM

Well I don't think you could call Russian ECC88 variants "unobtainable". You can get similar curves from a triode connected E55L with similar mu, but lower anode impedance and much higher gm ; and they are more unobtainable.

revintage · 25th January 2010, 12:49 PM

Hey SY,
Can admit it looks quite 88ish but with very good linearity at lower voltages(swings down to 10V at 5ma).

barretter · 25th January 2010, 01:04 PM

Is it some kind of state secret?

revintage · 25th January 2010, 01:23 PM

No, it´s just for fun

!

kevinkr · 04:24 PM

"No, it´s just for fun

!"

I.E. I suspect Lars wants you to guess what it is..

The hobbyist group I belong to occasionally plays the same game on its listserv, and someone almost always eventually comes up with the correct id..

Zen Mod · 25th January 2010, 05:21 PM

I'm suspicious because of T=25C

must be some hidden catch

revintage · 25th January 2010, 06:01 PM

Zen Mod,
Forgot to remove that one......

25th January 2010, 12:32 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Looks like one of the Russian ECC88 variants. You could get pretty similar curves (maybe a little higher gm) by paralleling two "normal" ECC88 sections. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

25th January 2010, 12:49 PM	#5
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Hey SY, Can admit it looks quite 88ish but with very good linearity at lower voltages(swings down to 10V at 5ma). __________________ Brgds Lars

25th January 2010, 01:23 PM	#7
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	No, it´s just for fun! __________________ Brgds Lars

25th January 2010, 04:20 PM	#8
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	"No, it´s just for fun !" I.E. I suspect Lars wants you to guess what it is.. The hobbyist group I belong to occasionally plays the same game on its listserv, and someone almost always eventually comes up with the correct id.. __________________ www.kta-hifi.net Last edited by kevinkr; 25th January 2010 at 04:24 PM.

25th January 2010, 05:21 PM	#9
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	I'm suspicious because of T=25C must be some hidden catch __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

25th January 2010, 12:28 PM	#2
barretter diyAudio Member Join Date: Apr 2003 Location: West Yorkshire, UK.	And it will remain unobtainable for the rest of us as you haven't told us its name.

25th January 2010, 12:39 PM	#4
barretter diyAudio Member Join Date: Apr 2003 Location: West Yorkshire, UK.	Well I don't think you could call Russian ECC88 variants "unobtainable". You can get similar curves from a triode connected E55L with similar mu, but lower anode impedance and much higher gm ; and they are more unobtainable.

25th January 2010, 01:04 PM	#6
barretter diyAudio Member Join Date: Apr 2003 Location: West Yorkshire, UK.	Is it some kind of state secret?

25th January 2010, 06:01 PM	#10
revintage diyAudio Member Join Date: May 2007 Location: Eskilstuna, Sweden	Zen Mod, Forgot to remove that one...... __________________ Brgds Lars

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