SE Tube Preamp circuit using 6922/6dj8 at low voltage(24volt) needed! anyone?

tone · 8th December 2002, 07:30 AM

i need a good circuit using 6922/6dj8 preferably at 24volts single ended.anyone can help?,..thanks

rgds,
tone

halojoy · 8th December 2002, 10:50 AM

Quote:

Originally posted by tone
i need a good circuit using 6922/6dj8 preferably at 24volts single ended.anyone can help?,..thanks
rgds,
tone

I would also like some more info of preamp Tube amps using lower voltages than 100V.

I tried to get some info on that searching the web
some years ago. But the resuslt was thin.
I just got a hold of a couple of schematics.
Pity, I might have started for real with tubes
if I had got ahold of some good alternatives.

Basically I think you can use the same design as in ordinary TUBE amplifiers. Only change some resistor values.
You just try and find those tubes, that preserve some of the good quality at lower voltages.
6922/6DJ8 is such a tube.

Maybe we just have to wait for Dice45.

Might take some time.

Thanks tone for bringing this subject up.

Seems very little research have been done of this in the
Home Labs of the TUBE women.
And their TUBE men.

Maybe halo and tone will have to do a little research for the un-knowing tube society

woody · 8th December 2002, 01:14 PM

I believe this month's issue of Valve that is online at the
bottlehead.com web page has a headphone amp that runs
on 60v that you might check out.

halojoy · 8th December 2002, 01:20 PM

Quote:

Originally posted by bob12345678
I believe this month's issue of Valve that is online at the
bottlehead.com web page has a headphone amp that runs
on 60v that you might check out.

Thanks, bob of numbers
I am on my way to www.bottlehead.com

Colt45 · 8th December 2002, 07:09 PM

ECC86 / 6GM8 maybe?

30v is the absoloute maximum plate voltage.

designed as an RF amplifier to run right off a car battery, no vibrator needed for B+.

albeit probably not too linear.

JoeBob · 8th December 2002, 08:18 PM

Just out of curiosity why 24 volts? If you've already got a 24v suply and don't want to spend cash to build another I'd say stick to transistors. But if you're just scared of the higher voltages don't be, when you work with higher voltages for preamps you're working with very low currents. As with everything you've go tto be careful, but not more so than with transistors.

Fossil · 9th December 2002, 05:40 AM

http://www.diyzone.net/images/buffer2.jpg
no, i dunno if this is any good.

kenpeter · 20th February 2010, 12:11 AM

Its a hybrid, so sorta cheating... But hey, 24V???

8th December 2002, 07:30 AM	#1
tone diyAudio Member Join Date: Aug 2002 Location: Malaysia	SE Tube Preamp circuit using 6922/6dj8 at low voltage(24volt) needed! anyone? i need a good circuit using 6922/6dj8 preferably at 24volts single ended.anyone can help?,..thanks rgds, tone

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8th December 2002, 01:14 PM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	I believe this month's issue of Valve that is online at the bottlehead.com web page has a headphone amp that runs on 60v that you might check out.

8th December 2002, 07:09 PM	#5
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	ECC86 / 6GM8 maybe? 30v is the absoloute maximum plate voltage. designed as an RF amplifier to run right off a car battery, no vibrator needed for B+. albeit probably not too linear.

8th December 2002, 08:18 PM	#6
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	Just out of curiosity why 24 volts? If you've already got a 24v suply and don't want to spend cash to build another I'd say stick to transistors. But if you're just scared of the higher voltages don't be, when you work with higher voltages for preamps you're working with very low currents. As with everything you've go tto be careful, but not more so than with transistors.

9th December 2002, 05:40 AM	#7
Fossil diyAudio Member Join Date: Sep 2001 Location: SG	http://www.diyzone.net/images/buffer2.jpg no, i dunno if this is any good.