48V B+ linestage - Page 2

Shoog · 20th February 2008, 10:18 AM

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.

Shoog

hirafu_boarder · 20th February 2008, 02:15 PM

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

Nordic · 20th February 2008, 04:02 PM

Missed the DC wallwart... but you can always rip out the internal rectifier/regultors and wire the transformer to the output directly...

Koifarm · 20th February 2008, 04:42 PM

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.

Eli Duttman · 20th February 2008, 06:00 PM

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 R_P 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.

Koifarm · 21st February 2008, 02:37 PM

If you like to try, below the schematic.

If sources are not DC free then ad capacitor at sig.in.

hirafu_boarder · 22nd February 2008, 06:48 AM

Koifarm,
Thanks for the suggestion and the schematic.

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

Jeff

nina · 25th February 2008, 04:13 PM

Quote:

Originally posted by Koifarm
[B]If you like to try, below the schematic.

Did you (may I ask) ?

ionomolo · 10th May 2008, 08:42 PM

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.

Nordic · 10th May 2008, 09:34 PM

Maybe not exactly what you are looking for.. but I found this little SMPS design cute...

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

20th February 2008, 06:00 PM	#15
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	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 R_P 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. __________________ Eli D.

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20th February 2008, 10:18 AM	#11
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	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. Shoog

20th February 2008, 02:15 PM	#12
hirafu_boarder diyAudio Member Join Date: Apr 2007	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

20th February 2008, 04:02 PM	#13
Nordic diyAudio Member Join Date: Sep 2005	Missed the DC wallwart... but you can always rip out the internal rectifier/regultors and wire the transformer to the output directly...

20th February 2008, 04:42 PM	#14
Koifarm diyAudio Member Join Date: Aug 2005	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.

21st February 2008, 02:37 PM	#16
Koifarm diyAudio Member Join Date: Aug 2005	If you like to try, below the schematic. If sources are not DC free then ad capacitor at sig.in.

22nd February 2008, 06:48 AM	#17
hirafu_boarder diyAudio Member Join Date: Apr 2007	Koifarm, Thanks for the suggestion and the schematic. I`ll add that to the list of tubes to experiment with! Jeff

10th May 2008, 08:42 PM	#19
ionomolo diyAudio Member Join Date: May 2007 Location: Los Angeles	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.

10th May 2008, 09:34 PM	#20
Nordic diyAudio Member Join Date: Sep 2005	Maybe not exactly what you are looking for.. but I found this little SMPS design cute... http://diyaudioprojects.com/Tubes/12...eamp/index.htm