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Old 24th November 2006, 09:46 PM   #1
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Question Octal tube as headphone amp output tube

Do you think 6L6 (russian 6P3-S) is a good candidate for output tube in CF xformerless stage?

Any other octals (not 6H13C - this one I know)? 6SN7, 6SL7, 6N7?

Intended for 32 ohm Philips HP1000
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Old 24th November 2006, 11:50 PM   #2
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Default Re: Octal tube as headphone amp output tube

Quote:
Originally posted by yagoolar
Do you think 6L6 (russian 6P3-S) is a good candidate for output tube in CF xformerless stage?
No.

Quote:

Any other octals (not 6H13C - this one I know)? 6SN7, 6SL7, 6N7?

Intended for 32 ohm Philips HP1000
The big problem with this is that cathode followers don't like working into such small loads. You get limited voltage output and horrible inefficiency. You'd be better off using a 45 triode xfmr coupled to the 32R headphones. A 45 can easily develop a couple of watts as a SET, and they are supposed to have excellent sonics.
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Old 25th November 2006, 12:57 AM   #3
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Transformerless headphone amps have been based on the White cathode follower, which has a very low OP impedance. I prefer the idea of a transformer, because it safely isolates the headphones so you don't suddenly get a few hundred volts across your ears if something goes wrong.
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Old 25th November 2006, 01:20 PM   #4
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I decided to use 6c4p-ev as input tube and 6c45p-ev as output one. Those are russian triodes.
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Old 25th November 2006, 06:27 PM   #5
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any chance we could see a schematic?
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Old 25th November 2006, 08:06 PM   #6
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Default Re: Octal tube as headphone amp output tube

Quote:
Originally posted by yagoolar
Any other octals (not 6H13C - this one I know)? 6SN7, 6SL7, 6N7?

Intended for 32 ohm Philips HP1000

I use a 13EM7 in an OTL that drives minimum 32 ohms fine

It's in a WCF arrangement, trioded 6CL6 bottom tube, low-mu section of the 13EM7 as the top, high-mu section of the 13EM7 as the voltage amp.
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Old 25th November 2006, 09:11 PM   #7
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Quote:
Originally posted by sorenj07
any chance we could see a schematic?

I hope. By tomorrow.
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