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Old 9th March 2012, 05:25 PM   #1
50AE is offline 50AE  Bulgaria
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Default 6N6P best musicality? Help with modes.

Hi,
I must say I'm a new learner, I don't have much practical experience with tube circuits.

I built a Unbalancer for my DAC output using 6N6P for the anode and SRPP stage.

B+ = 200V, I can vary it to max 240V

Anode follower:
Ia = 18mA
Bias ~ -2V (IIRC can't see cathode resistor)

SRPP:
Ia = ~2,4V with 150R at cathode

I'm curious if someone tried at what mode these tubes sound best? Do they at lower anode currents?

Impressions: This output stage is great, since I built it there was huge improvement in the sounds - no more fatiguing, screaming music, very loud levels permissible, great 3D picture, much detail and warmth. This is comparing to Lampizator's single 6N6P output.

Last edited by 50AE; 9th March 2012 at 05:29 PM.
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Old 9th March 2012, 06:46 PM   #2
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Good choice staying away from any Lampizator design.

The 6n6p seems quite happy at higher plate currents. Voltage suitable for what you want to run the tube at dissipation-wise. I usually aim for something over 20mA per triode. This is also where the plate resistance is at its lowest, which I think has great benefit in my transformer coupled designs.

I have also used the 6n6p at 6 mA per section in an LTP toplogy with good results. But this was driving EL34 outputs, not a preamp output. Best off with the higher currents imo.
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Old 10th March 2012, 11:15 AM   #3
50AE is offline 50AE  Bulgaria
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I will try running the 6N6P at 3-4mA (anode follower) per triode and see how it sounds. A higher (10mA) current will be for the SRPP, but anyway I don't need to drive heavy loads.

I'm aiming for low currents. If I don't like the sound, I could change the tubes, right? Something like ECC82 for anode follower and for SRPP, maybe I would leave 6N6P? Some people tell me 6N series sound dim, but I'd like to see myself.

The next stage will be a tube amplifier with easy driven input driving tubes, I'm aiming to build something like Loftin white.
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Old 10th March 2012, 11:31 AM   #4
Zen Mod is offline Zen Mod  Serbia
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what's wrong with using graphs ?




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Old 10th March 2012, 11:57 AM   #5
50AE is offline 50AE  Bulgaria
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Nothing wrong, but I've been told to trust my ears mostly than graphs. Thank you for the link.
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Old 10th March 2012, 12:02 PM   #6
Zen Mod is offline Zen Mod  Serbia
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nope ;

ears are most important , but engineering is what saves you from burned tubes ....... ignorance ..... and wasting time

starting engineering way you have basic working circuit , and from there you're using ears , not before

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Old 10th March 2012, 12:06 PM   #7
50AE is offline 50AE  Bulgaria
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Of course, it is correct. But what's wrong setting a tube to a low quiescent current?
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Old 10th March 2012, 12:37 PM   #8
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well , nothing - if needed swing is adequate for working point and if that suits you
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Old 10th March 2012, 06:06 PM   #9
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***It is strange! This tube was manufactured in Russia, but it is not particularly fond of. And it is very cheap.
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Old 10th March 2012, 07:31 PM   #10
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Quote:
Originally Posted by 50AE View Post
Of course, it is correct. But what's wrong setting a tube to a low quiescent current?
Look at the transfer characteristics (Ug-Ia) graph in the datasheet. At 3-4mA you are operating the 6N6P in its most non-linear part... It needs at least 8-10mA to sound good!
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