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FS: Balanced tube gain stage (line stage, dac output...)
FS: Balanced tube gain stage (line stage, dac output...)
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Old 1st December 2020, 04:11 PM   #1
DIYspaceW is offline DIYspaceW  Slovenia
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Join Date: May 2009
Location: Slovenia
Default FS: Balanced tube gain stage (line stage, dac output...) SPECIAL OFFER

Up for sale is a nice balanced gain stage board using the 12AU7 tubes. The original circuit is from Andrea on his page:
Hi-End DAC tube output stage
As you see on the pictures there are no pcb sockets installed as I used chassis mounting but I guess this is no problem to solder
a 9-pin ceramic or better belton pcb socket on the board.
The CCS for the tubes is 2sk170BL this way it sounds uncolored! The original CCS had a glare like sound and this is not my cup of tea. But If you want it
back to original schematic then I guess its only two Jfets and 4x resistors to change.
On the board are very good parts, also the 2.2uF russian MKP new production very good sounding.

For sale are also mains transformer EI core and a special wide band 20H choke.
If you want the populated board only the price is 150 EUR (icluded a nice pair of GE 12AU7 tubes)
Mains transformer (P: 230V S:230V @ 300mA + 15V @ 4A) and 20H 170mA choke= 100 EUR

I am shipping worldwide!

Click the image to open in full size.

Click the image to open in full size.

Last edited by DIYspaceW; 16th January 2021 at 09:52 PM.
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Old 6th December 2020, 07:06 AM   #2
DIYspaceW is offline DIYspaceW  Slovenia
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Join Date: May 2009
Location: Slovenia
Feel free to make me an offer. The transformer and choke can be sold individually.
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Old 10th December 2020, 02:03 PM   #3
DIYspaceW is offline DIYspaceW  Slovenia
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Still available!
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Old 2nd January 2021, 07:30 AM   #4
DIYspaceW is offline DIYspaceW  Slovenia
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Join Date: May 2009
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Updated price!!!
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Old 3rd January 2021, 09:00 AM   #5
nautibuoy is offline nautibuoy  United Kingdom
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Do you know what the gain of this line stage is - I couldn't see it on Andrea's site?

How is your build configured (SE/Bal, etc)? Can you post some pictures of the items please?
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Old 3rd January 2021, 09:45 AM   #6
DIYspaceW is offline DIYspaceW  Slovenia
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Join Date: May 2009
Location: Slovenia
Its ballanced but it can be also SE if you want I can remove the output buffers...Yes I need to make some pictures...
The half of 12au7 is the gain aprox. 8-9

Last edited by DIYspaceW; 3rd January 2021 at 10:03 AM.
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Old 3rd January 2021, 11:23 AM   #7
nautibuoy is offline nautibuoy  United Kingdom
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Is that voltage gain or decibels?

Pictures would be good.
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Old 3rd January 2021, 01:34 PM   #8
DIYspaceW is offline DIYspaceW  Slovenia
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Voltage gain!
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Old 3rd January 2021, 01:44 PM   #9
DIYspaceW is offline DIYspaceW  Slovenia
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Picture added
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Old 16th January 2021, 09:50 PM   #10
DIYspaceW is offline DIYspaceW  Slovenia
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Join Date: May 2009
Location: Slovenia
2 DAY Special offer the board + mains transformer + choke = 150 EUR
DONT MISS IT!!!!!
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