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Old 28th July 2012, 11:09 PM   #1
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Default 6SN7 6N8S preamp suggestions

6SN7 6N8S schematic preamp suggestions

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I'm looking for high gain, high input impedance, low output impedance, low noise design with only 2 tubes so one per channel.

Ideas and suggestions will welcome.
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Old 28th July 2012, 11:14 PM   #2
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Quote:
Originally Posted by merlin el mago View Post
6SN7 6N8S schematic preamp suggestions

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I'm looking for high gain, high input impedance, low output impedance, low noise design with only 2 tubes so one per channel.

Ideas and suggestions will welcome.
I've had good experiences with the SRPP,I haven't tried the other configurations. Just be sure to elevate your heaters. Thanks

Denny
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Old 28th July 2012, 11:18 PM   #3
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Thanks Denny, could you post your schematic used and let me know: gain, input/output impedance, etc?
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Old 28th July 2012, 11:28 PM   #4
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Thanks Denny, could you post your schematic used and let me know: gain, input/output impedance, etc?
Sure, I have the pic attached. Since the 12AU7 and 6SN7 are so close I made the substitution. The sound is really quite nice. Since the 6SN7 is an 8-pin octal you will have to change pin-out arrangment. I don't remember the gain, but it should be sufficent for what your looking for.

BTW, this schematic is designed to give you elevation on those heaters! Thanks
Attached Images
File Type: gif 12au7lin.gif (19.1 KB, 733 views)

Last edited by denny9167; 28th July 2012 at 11:33 PM.
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Old 28th July 2012, 11:34 PM   #5
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Looks nice and very easy to do, surely I will try, thank you.
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Old 29th July 2012, 12:55 AM   #6
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been thinking if srpp would be good or maybe even ideal to drive a low impedance trafo output
which could be balanced 600/600 ohm
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Old 29th July 2012, 10:57 AM   #7
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I don't want to use output transformer.
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Old 29th July 2012, 11:15 PM   #8
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Use a mu follower. More gain, much less distortion than and SRPP and still the low output Z. Run the 6SN7 at around 5mA.

Cheers

Ian
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Old 30th July 2012, 12:12 AM   #9
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Use a mu follower. More gain, much less distortion than and SRPP and still the low output Z. Run the 6SN7 at around 5mA.

Cheers

Ian
I would agree, I had a mu follower pre using 6DJ8s and it had 28 dB gain very little distortion.
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Old 30th July 2012, 04:06 AM   #10
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Originally Posted by ruffrecords View Post
Use a mu follower. More gain, much less distortion than and SRPP and still the low output Z. Run the 6SN7 at around 5mA.

Cheers

Ian
Put a CCS on the plate of the voltage amplifier, bias it with LEDs, direct couple the two halves, and a put CCS on the mu follower. You will have a nice preamp.
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