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Old 13th February 2011, 05:24 PM   #1
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Default 6N1P and 6N6P OTL headphone amp

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
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Old 13th February 2011, 05:55 PM   #2
Stixx is offline Stixx  Germany
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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...
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Old 13th February 2011, 09:57 PM   #3
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Man, that chassis's built like a tank. Half inch thick (?) with pop rivets into a blind hole?
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Old 14th February 2011, 02:25 AM   #4
miklos is offline miklos  Canada
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Might be tubes.
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Old 14th February 2011, 09:13 PM   #5
orson56 is offline orson56  Italy
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Default Here the schematic

Quote:
Originally Posted by orson1956 View Post
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
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Old 28th September 2011, 06:55 PM   #6
arche13 is offline arche13  France
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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
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Old 28th September 2011, 06:56 PM   #7
arche13 is offline arche13  France
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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
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Old 28th September 2011, 07:37 PM   #8
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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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Old 28th September 2011, 09:46 PM   #9
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Which headphones do you use?

Cheers

Ian
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Old 26th January 2012, 08:30 PM   #10
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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.
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