Has anyone tried a 6S4A as a 300B driver tube? - diyAudio
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Old 18th January 2004, 06:19 PM   #1
MIKET is offline MIKET  United States
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Default Has anyone tried a 6S4A as a 300B driver tube?

This looks like the ideal driver tube:
http://frank.pocnet.net/sheets/093/6/6S4A.pdf

I'm thinking 6922 > 6S4A > 300B
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Old 19th January 2004, 12:00 AM   #2
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6s4a is my all time favorite driver tube for electrostatic
headphones. As a 300b driver it should work well, but the
extra voltage it is capable of is very much wasted on a 300B.

2 sections of 6sn7 in parallel has more drive capability and the
300B really wants that when you go into positive grid drive
current.
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Old 19th January 2004, 12:16 AM   #3
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Hi,

Quote:
2 sections of 6sn7 in parallel has more drive capability and the 300B really wants that when you go into positive grid drive current.
Parallel triodes aren't exactly paradise either...

The 6S4 is the predecessor of the 12B4, plenty of juice to drive a 300B, I reckon.

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Old 19th January 2004, 01:02 AM   #4
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IIRC it's about 2x6SN7 or 12AU7. Speaking of which, I'm suprised Frank would suggest it, I'm told it looks like a 6C4 on steriods! Graphs look like it.

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Old 19th January 2004, 01:15 AM   #5
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Hi,

Quote:
IIRC it's about 2x6SN7 or 12AU7.
No, Tim. Two sections of a 6SN7, not two 6SN7s.

Quote:
I'm suprised Frank would suggest it, I'm told it looks like a 6C4 on steriods!
So what if it "looks" like that ?

And what on earth has it got to do with me at all?

Do you have the same kind of remarks for it's cousin, the 12B4 too?

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Old 19th January 2004, 05:44 AM   #6
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As far as I'm concerned, 12B4 is very different from it. Far more current (well... as I recall) and a radically different construction.

Quote:
And what on earth has it got to do with me at all?
What has your prejudice against 12AU7 got to do with anything..

Tim
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Old 19th January 2004, 11:45 PM   #7
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Hi,

Quote:
As far as I'm concerned, 12B4 is very different from it.
So? Historically one was a successor to the other.

Quote:
What has your prejudice against 12AU7 got to do with anything..
Prejudice has got nothing to do with it, measurements do.

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Old 21st January 2004, 03:41 AM   #8
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Default Propsed Circuit

The input stage is a 6922 yet to be drawn.
Here is my proposed driver.
The output is a 300 B into a 2.5 K SE transformer.
Any comments.
Attached Images
File Type: gif slide1.gif (3.7 KB, 921 views)
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Old 22nd January 2004, 01:05 AM   #9
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Default Finished Schematic

Decided on a 6SN& over a 6922 schematic below:
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File Type: gif 300b-6s4.gif (6.5 KB, 875 views)
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Old 23rd January 2004, 03:54 AM   #10
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Default Has anyone got the tools to simulate this circuit before I build it?

Any of the experts out there have a simulation tool that can handle this circuit.
I would like to assemble this weekend if it looks feasable.
The current sources will be a Supertex Enhancent mode FET.
Power Supply and a 1 minute delay circuit for the B+ are complete and tested, I will draw them out over the next few days.
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