6-volt rectifier tube

E.T. · 15th September 2009, 07:12 PM

Hi everybody,

I'm planning to build a van Waarde 6as7 headphone amp, and I'm looking for a full wave rectifier tube with 6-volt heaters. The spec sheets have me stumped.

Current draw:

2 x 3a5 10 mA
6922 20 mA
6as7 250 mA @ 250V plate (I'll have plate @ 110V)

Does such a creature exist? Would za half-wave rectifier do?

Also, can anyone steer me to a simple passive bass and treble tone control circuit?

I know this marks me out as a philistine among purists, but I'm always trying to tweak the frequency balance of various albums.

My most recent project is a Pete Millett "Starving Student" headphone amp. It's remarkably fast and accurate (certainly for $40!) but still has a touch of transistorized glassy-brittleness. I can definitely recommend it for beginners. When I get access to a digital camera, I'll send in some audio porn plus the modified schematic.

Thanks in advance!

Geek · 15th September 2009, 07:31 PM

That's serious current.

Parallel two EZ81/6CA4 if you want to stick with 6.3V heater rectifiers would be my suggestion.

Cheers!

Gordy · 15th September 2009, 08:27 PM

Quote:

Originally Posted by Geek

That's serious current.

Parallel two EZ81/6CA4 if you want to stick with 6.3V heater rectifiers would be my suggestion.

Cheers!

EZ81 works well. They are nominally a 6.3V heater.

I think you might need three of them.

http://www.jj-electronic.com/pdf/EZ81.pdf

leadbelly · 15th September 2009, 09:23 PM

6by5

Geek · 15th September 2009, 09:44 PM

Quote:

Originally Posted by leadbelly

6by5

I learned a new one

Thanks!

Bandersnatch · 15th September 2009, 09:56 PM

hey-Hey!!!,
Try finding 6AX6. Heater load is 2.5A, and it'll out-deliver a GZ34. If you find some, do let me know, I'd love to have a few more...I have bought every one I've seen sold, and I have exactly 5, all from the same buy...

cheers,
Douglas

dsavitsk · 15th September 2009, 10:05 PM

Quote:

Originally Posted by E.T.

but still has a touch of transistorized glassy-brittleness. I can definitely recommend it for beginners.

"glassy-brittleness" is almost certainly not the fault of the mosfets used.

mach1 · 15th September 2009, 11:24 PM

2 x 6CJ3

Bandersnatch · 15th September 2009, 11:40 PM

Quote:

Originally Posted by mach1

2 x 6CJ3

There are ooodles of 6V damper diodes; octals, 9-pin, and 12-pin...pick your flavour...

cheers,
Douglas

E.T. · 25th September 2009, 06:44 PM

After 150 hours it's certainly mellowed. I'm using Hexfreds, 12,000 uF of Denon "Audio" electrolytics in the p/s, and Elna Silmic II's as local caps. I just figured the brittleness would be the only transistors in the circuit. What else might it be?

Thx!

15th September 2009, 07:12 PM	#1
E.T. diyAudio Member Join Date: Sep 2009	6-volt rectifier tube Hi everybody, I'm planning to build a van Waarde 6as7 headphone amp, and I'm looking for a full wave rectifier tube with 6-volt heaters. The spec sheets have me stumped. Current draw: 2 x 3a5 10 mA 6922 20 mA 6as7 250 mA @ 250V plate (I'll have plate @ 110V) Does such a creature exist? Would za half-wave rectifier do? Also, can anyone steer me to a simple passive bass and treble tone control circuit? I know this marks me out as a philistine among purists, but I'm always trying to tweak the frequency balance of various albums. My most recent project is a Pete Millett "Starving Student" headphone amp. It's remarkably fast and accurate (certainly for $40!) but still has a touch of transistorized glassy-brittleness. I can definitely recommend it for beginners. When I get access to a digital camera, I'll send in some audio porn plus the modified schematic. Thanks in advance!

15th September 2009, 09:23 PM	#4
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	6by5 __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

15th September 2009, 09:56 PM	#6
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, Try finding 6AX6. Heater load is 2.5A, and it'll out-deliver a GZ34. If you find some, do let me know, I'd love to have a few more...I have bought every one I've seen sold, and I have exactly 5, all from the same buy... cheers, Douglas __________________ the Tnuctipun will return

15th September 2009, 11:24 PM	#8
mach1 diyAudio Member Join Date: Sep 2004 Location: Brisvegas	2 x 6CJ3 __________________ Au rutti wop-bop-a-loom-bop-a-boom-bam-boom - Richard Penniman

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15th September 2009, 07:31 PM	#2
Geek diyAudio Member Join Date: Sep 2004	That's serious current. Parallel two EZ81/6CA4 if you want to stick with 6.3V heater rectifiers would be my suggestion. Cheers!

25th September 2009, 06:44 PM	#10
E.T. diyAudio Member Join Date: Sep 2009	After 150 hours it's certainly mellowed. I'm using Hexfreds, 12,000 uF of Denon "Audio" electrolytics in the p/s, and Elna Silmic II's as local caps. I just figured the brittleness would be the only transistors in the circuit. What else might it be? Thx!

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