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Old 20th February 2008, 10:18 AM   #11
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I heard Woodturner Frans's 24V Aikido with the ECC86's and it bettered my SLCF clone on the day (though a recent tweak mean't mine wasn't at its best). I can see from the curves that the ECC86 doesn't look that exciting - but it seems to work all the same.

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Old 20th February 2008, 02:15 PM   #12
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Eli, revintage, Shoog,
Thanks for the suggestions.

I already have some 6DJ8 so that will be the first attempt.
I had not considered a CCS, but it makes sense since I do have the -6.9 available. From my limited understanding, the CCS will be particularly helpful with stabilisation and reducing noise/distortion at such low plate currents?

Many thanks friends!

Jeff
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Old 20th February 2008, 04:02 PM   #13
Nordic is offline Nordic  South Africa
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Missed the DC wallwart... but you can always rip out the internal rectifier/regultors and wire the transformer to the output directly...
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Old 20th February 2008, 04:42 PM   #14
Koifarm is offline Koifarm  Netherlands
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Just use a 6N6P dubbel triode. I think the best tube for low B+ voltage. If you like i publis schematic? I used this tube a lot as preamp buffer for Hypex UCD amps with B+ voltage of 42 Volts.
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Old 20th February 2008, 06:00 PM   #15
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IMO, mediocre linearity is not much of an issue in cathode followers, especially when CCS loaded. Heck, even the grotesquely non-linear 6ES8 can make an acceptable CF. High gm and low RP make for good CFs.

I made my suggestion based on the characteristics of the "wall wart" PSU, which this thread's originator already possesses. A 6GM8 fits the PSU, like a glove.
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Old 21st February 2008, 02:37 PM   #16
Koifarm is offline Koifarm  Netherlands
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If you like to try, below the schematic.

Click the image to open in full size.

If sources are not DC free then ad capacitor at sig.in.
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Old 22nd February 2008, 06:48 AM   #17
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Koifarm,
Thanks for the suggestion and the schematic.

I`ll add that to the list of tubes to experiment with!

Jeff
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Old 25th February 2008, 04:13 PM   #18
nina is offline nina  United Kingdom
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Quote:
Originally posted by Koifarm
[B]If you like to try, below the schematic.

Click the image to open in full size.
Did you (may I ask) ?
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Old 10th May 2008, 08:42 PM   #19
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I'm going the opposite direction, do you know of any good tube and layout to work at high voltages and low currents (200V 1.1 mA) ? It would be intended to give some color to a solid state amplifier so it has to operate at low gain.

I need such a low current since i plan to operate it from a flash camera inverter.
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Old 10th May 2008, 09:34 PM   #20
Nordic is offline Nordic  South Africa
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Maybe not exactly what you are looking for.. but I found this little SMPS design cute...

http://diyaudioprojects.com/Tubes/12...eamp/index.htm
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