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Old 15th September 2009, 07:12 PM   #1
E.T. is offline E.T.  United States
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Default 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!
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Old 15th September 2009, 07:31 PM   #2
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That's serious current.

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

Cheers!
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Old 15th September 2009, 08:27 PM   #3
Gordy is offline Gordy  United Kingdom
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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
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Old 15th September 2009, 09:23 PM   #4
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6by5
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Old 15th September 2009, 09:44 PM   #5
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6by5
I learned a new one

Thanks!
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Old 15th September 2009, 09:56 PM   #6
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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
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Old 15th September 2009, 10:05 PM   #7
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Originally Posted by E.T. View Post
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.
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Old 15th September 2009, 11:24 PM   #8
mach1 is offline mach1  Australia
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2 x 6CJ3
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Old 15th September 2009, 11:40 PM   #9
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2 x 6CJ3
There are ooodles of 6V damper diodes; octals, 9-pin, and 12-pin...pick your flavour...
cheers,
Douglas
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Old 25th September 2009, 06:44 PM   #10
E.T. is offline E.T.  United States
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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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