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GERMANIUM Single ended Class A Headphone Amp

post #1 of 12
2/18/10 at 4:33am
Thread Starter 
Thought some here might be interested in this.

GERMANIUM Single ended Class A Headphone Amp

se
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post #2 of 12
2/18/10 at 4:37am
Input caps + interstage caps + output caps... something is a little funky.
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post #3 of 12
2/18/10 at 4:43am
Thread Starter 
Certainly not the most elegant I've seen. And it's single ended running off a single supply, hence all the coupling caps.

But the funkiness is part of its charm.

se
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post #4 of 12
2/18/10 at 4:59am
I kind of like the SOL amp for the funk - SE MOSFET
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post #5 of 12
2/18/10 at 6:02am
I liek Steves idea of a single transformer better for elegance
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post #6 of 12
2/18/10 at 10:35am
Quote:
Originally Posted by FallenAngel View Post
I kind of like the SOL amp for the funk - SE MOSFET
I kind of the the PRR-SOL. See post #12 for the schematic and post #10 where PRR gives us the education as to the changes.
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post #7 of 12
2/18/10 at 12:07pm
From what I can tell, it's a pretty authentic 1960s sort of design; single supplies and coupling caps were de rigeur back then. It's easy to sneer at it, but I would not be at all surprised if it not only measured extremely well but sounded quite good, to boot.

I've been playing around with a very similar design, adapted from a preamp schematic published in '67. It sounds quite good with BC327s, but I've got a bunch of old germanium transistors coming from the FSU to play with. Will it be "funky"? Probably. Will it sound good? We'll see.
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post #8 of 12
2/18/10 at 2:09pm
What an unfortunate -=name=- for a headphone amplifier......
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post #9 of 12
2/18/10 at 3:30pm
Beat me to it - it was an immediate reflexive thought. Funny how some things make lasting impressions.
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post #10 of 12
2/18/10 at 4:36pm
Quote:
Originally Posted by Beefy View Post
What an unfortunate -=name=- for a headphone amplifier......
I had a similar, but I believe unrelated, reaction.

My first thought was 'thermal runaway'.
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post #11 of 12
2/18/10 at 5:10pm
Thread Starter 
Quote:
Originally Posted by TzeYang View Post
I liek Steves idea of a single transformer better for elegance


But of course it wasn't JUST a transformer. It was followed by a er, follower.

Actually I have a bunch of 2N1309's here that I was planning to try for a headphone buffer. 1:1 input trannie -> germanium emitter follower.

Someday...

se
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post #12 of 12
2/18/10 at 7:48pm
Quote:
Originally Posted by MoodySteve View Post
I had a similar, but I believe unrelated, reaction.

My first thought was 'thermal runaway'.
or "the shortest distance between any two points is: the chassis!"

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