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Old 26th October 2004, 03:10 AM   #1
jleaman is offline jleaman  Belgium
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Default 6AS7 Mono Block's

Im thinking about building 2 mono blocks of these amp's After xmas. Has any one built a pair or a stereo block using a schematic close to this ? Any comments to the schematic would be greatly appreciated.

Thanks.


J'
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Old 26th October 2004, 03:13 AM   #2
jleaman is offline jleaman  Belgium
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And the psu schematic..
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Old 26th October 2004, 09:56 AM   #3
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The thread for the 'lilliput' amp is farely similar, same output triode anyways.
This circuit has more gain and will work better than the lilliput version. I think it will sound great.

I built something similar but used a single triode at the input. I tried ECC83, ECC81, ECC85, and E88CC. It didn't have enuff gain, tho much more than the lilliput amp. I also used an outputtranny that was meant for EL84s so it was a bad match there too. So I didn't get the power I could have, but it sounded very good up untill clipping. I built it with parts laying around the house at the same time as I built an OTL using the same pwr tube just to hear the tube in a SE tranny amp.

The 6AS7 needs a large drive voltage to give it's max. +-100V is about right. The lilliput amp isn't even close, unless it's driven by a very large signal that is.
The large drive requirement is the only downer regarding this tube, soundwise it's excellent.
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Old 26th October 2004, 12:45 PM   #4
Yvesm is offline Yvesm  France
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Quote:
The 6AS7 needs a large drive voltage to give it's max. +-100V is about right.
Yeap ! Did you notice the 700V B+ on the driver ?
This design afraid me a lot

Yves.
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Old 26th October 2004, 02:54 PM   #5
jleaman is offline jleaman  Belgium
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i'm not scared of voltage. But then again i'm super careful and always aware of was is going on..


But i do like this simple design..
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Old 26th October 2004, 03:21 PM   #6
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I too will be soon playing with 6080 (6AS7) amps. Thanks for the circuit!
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Old 26th October 2004, 03:49 PM   #7
jleaman is offline jleaman  Belgium
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i got lots more : O ) i got lots of ideas and stuff yo ucan email me to talk about your parts used and stuff.. and ideas..
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Old 26th October 2004, 04:39 PM   #8
Yvesm is offline Yvesm  France
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Quote:
i'm not scared of voltage. But then again i'm super careful and always aware of was is going on..
Sure, me too !
I was wondering about Vfk of this poor 6BM8
Both tubes seems quite stressed.
It's a very special design IMHO, perhaps vy good anyway !

Yves
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Old 26th October 2004, 04:41 PM   #9
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Make sure you guys check out www.atma-sphere.com Ralph Karsten is the 6AS7 tube king!!!!



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Old 26th October 2004, 05:03 PM   #10
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Default mmmmm

Looks nice and simple...

whats the output? I'm at 92dB/W/m
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In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home
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