6N1P and 6N6P OTL headphone amp

orson1956 · 13th February 2011, 05:24 PM

Hi all!

This is one of my last valve project. An OTL headphone amp with a 6N1P in ground cathode for input stage and a 6N6P in SRPP for the output stage.
I've found that the best working point for this tubes are 10 ma for the 6N1P and 22 ma for the 6N6P. The circuit is a classic and in the next post I'll send to you. With my Sennheiser HD590 and AKG K271 Mk2 works really fine, what a sound!!! I have a slight and impercectible hum but I soon resolve it with a choke in the PSU, now I have a CRC cell but it's bettere a CLC; next step.
The case is a bit ugly but I have used some recycled waste from my factory (rivets... like a Douglas DC3... could be a new trend???)

I bought a lot of russian valves on ebay, different factories and years and works really fine, great sound and incredible price, I'm working with them in my next project: a RIAA-LINE preamplifier.

ciao

Stixx · 13th February 2011, 05:55 PM

That's quite a nice build, and I do like the rivets...

Will you post a schematic (since I have made a schematic for 6N23P-6N6P myself

?
Just being curious...

HollowState · 13th February 2011, 09:57 PM

Man, that chassis's built like a tank. Half inch thick (?) with pop rivets into a blind hole?

miklos · 14th February 2011, 02:25 AM

Might be tubes.

orson56 · 14th February 2011, 09:13 PM

Quote:

Originally Posted by orson1956

Hi all!

This is one of my last valve project. An OTL headphone amp with a 6N1P in ground cathode for input stage and a 6N6P in SRPP for the output stage.
I've found that the best working point for this tubes are 10 ma for the 6N1P and 22 ma for the 6N6P. The circuit is a classic and in the next post I'll send to you. With my Sennheiser HD590 and AKG K271 Mk2 works really fine, what a sound!!! I have a slight and impercectible hum but I soon resolve it with a choke in the PSU, now I have a CRC cell but it's bettere a CLC; next step.
The case is a bit ugly but I have used some recycled waste from my factory (rivets... like a Douglas DC3... could be a new trend???)

I bought a lot of russian valves on ebay, different factories and years and works really fine, great sound and incredible price, I'm working with them in my next project: a RIAA-LINE preamplifier.

ciao

arche13 · 28th September 2011, 06:55 PM

Hello

I wish to build this amplifier,

But I have a helmet Grado sr60 impedance 32 ohms.

Work you he(it) with no problem at all or is it necessary to make modifications?

Cordially

arche13 · 28th September 2011, 06:56 PM

Hello

I wish to build this amplifier,

But I have a helmet Grado sr60 impedance 32 ohms.

Work you he(it) with no problem at all or is it necessary to make modifications?

Cordially

artosalo · 28th September 2011, 07:37 PM

Would it give even lower output impedance if both 6N6P halves were connected in parallel and as a cathode follower instead of SRPP ?

There is also quite high overall gain. Is that much really required ?

ruffrecords · 28th September 2011, 09:46 PM

Which headphones do you use?

Cheers

Ian

merlin2069er · 26th January 2012, 08:30 PM

Very nice, how much did the amp cost you to build? How does it sound?

If you have the power supply schematics, please post it as well.

13th February 2011, 09:57 PM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Man, that chassis's built like a tank. Half inch thick (?) with pop rivets into a blind hole? __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

14th February 2011, 02:25 AM	#4
miklos diyAudio Member Join Date: Jul 2004 Location: toronto	Might be tubes. __________________ miklos

28th September 2011, 09:46 PM	#9
ruffrecords diyAudio Member Join Date: Jun 2007 Location: Holt, Norfolk	Which headphones do you use? Cheers Ian __________________ Ian

26th January 2012, 08:30 PM	#10
merlin2069er diyAudio Member Join Date: Sep 2008 Location: Toronto	Very nice, how much did the amp cost you to build? How does it sound? If you have the power supply schematics, please post it as well. __________________ F5 / B1 / dcb1 / Monica Dac / ezDac / Dynaco ST 35 / jFet BOZ / Lightspeed attenuator *** my amazon shop * books & dvds ***

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13th February 2011, 05:55 PM	#2
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	That's quite a nice build, and I do like the rivets... Will you post a schematic (since I have made a schematic for 6N23P-6N6P myself ? Just being curious...

28th September 2011, 06:55 PM	#6
arche13 diyAudio Member Join Date: Jan 2009	Hello I wish to build this amplifier, But I have a helmet Grado sr60 impedance 32 ohms. Work you he(it) with no problem at all or is it necessary to make modifications? Cordially

28th September 2011, 06:56 PM	#7
arche13 diyAudio Member Join Date: Jan 2009	Hello I wish to build this amplifier, But I have a helmet Grado sr60 impedance 32 ohms. Work you he(it) with no problem at all or is it necessary to make modifications? Cordially

28th September 2011, 07:37 PM	#8
artosalo diyAudio Member Join Date: Feb 2010	Would it give even lower output impedance if both 6N6P halves were connected in parallel and as a cathode follower instead of SRPP ? There is also quite high overall gain. Is that much really required ?

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