Ping Poindexter - 6SN7 Moebius Linestage Question - diyAudio
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Old 26th December 2008, 04:26 PM   #1
ALBQ is offline ALBQ  United States
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Default Ping Poindexter - 6SN7 Moebius Linestage Question

Poindexter,

I have a bunch of 6SN7's lying around that I want up to build a preamp with. There was a 6Moons article a while back that pictured the 6SN7 Moebius Linestage you built for Terry Cain. I have seen your 6AQ5 and 6T4 versions, would you be willing to provide insight into the schematic for the 6SN7 version?

Thank you -ALBQ

Link to 6Moons article:
http://www.6moons.com/audioreviews/yamamoto/a08_5.html
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Old 27th December 2008, 10:09 AM   #2
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Try the Tube DIY Asylum.

Tube DIY Asylum
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Old 28th December 2008, 02:38 PM   #3
ALBQ is offline ALBQ  United States
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Default 6SN7 Moebius Schematic

I tried searching AudioAsylum and came up empty. Lots of posts but, no references to the 6SN7 version.
Thanks -ALBQ
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Old 28th December 2008, 05:30 PM   #4
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Yo.  Hold on a minute, I'll draw the schem small-sized so I can stick it in one of these posts.  The problem with the original 6SN7 circuit was that it just had too much hum, but with the 6AQ5 power supply, it's dead quiet.  Watch out for microphonic 6SN7s, though.  Bad fer the rez.

Aloha,

Poinz
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Old 28th December 2008, 06:20 PM   #5
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Okay, here ya go:

Click the image to open in full size.

Good sound, this; as good as the 6T4 circuit, though it doesn't have the drive.  Plenty for tube amps, though.

Aloha,

Poinz
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Old 28th December 2008, 07:50 PM   #6
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Thanks for the schematic, Eric.

I'm still enjoying my 6V6 Music Machine (upgraded with better OTs since I snapped a pic of it), but if I need a preamp, I'll be building a Moebius.

Best wishes for 2009.

John
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Old 28th December 2008, 09:09 PM   #7
ALBQ is offline ALBQ  United States
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Default Many Thanks - Appreciate it!

Poindexter,
Thank you very much for posting the schematic. Sincerely appreciated!
Thanks again -ALBQ
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Old 5th January 2009, 01:16 AM   #8
ALBQ is offline ALBQ  United States
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Default 6SN7 Moebius - Prototype

All,
6SN7 Moebius preamp and power supply prototype. Note that I am using a somewhat different power supply circuit.

Many thanks to Poindexter for a very nice sounding and simple design.

Cheers - ALBQ
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File Type: jpg moebius-proto-small.jpg (35.9 KB, 573 views)
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Old 5th January 2009, 01:17 AM   #9
ALBQ is offline ALBQ  United States
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Default 6SN7 Moebius preamp

Another view
Cheers - ALBQ
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Old 5th January 2009, 01:27 AM   #10
ALBQ is offline ALBQ  United States
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Default Prototype Power Supply Schematic

Prototype power supply schematic. Note will change transformer type for safety reasons in final design.
Cheers - ALBQ
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