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-   -   12v B+ Tube buffer 12AX7 (http://www.diyaudio.com/forums/tubes-valves/173925-12v-b-tube-buffer-12ax7.html)

benproiii 19th September 2010 07:09 PM

12v B+ Tube buffer 12AX7
 
1 Attachment(s)
will this circuit provide A little gain but add tube like sound to my amplifier

Frank Berry 19th September 2010 07:16 PM

No. You will need a much higher plate voltage.

benproiii 19th September 2010 07:20 PM

it is a copy of this headphones amp i removed the mosfet because it does not need current gain

NP-100v12: DIY 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier

Merlinb 19th September 2010 07:29 PM

Quote:

Originally Posted by benproiii (Post 2308269)
will this circuit provide A little gain but add tube like sound to my amplifier

If you use an ECC81 or ECC82 then yes, it will amplify a bit (not much). It will distort a lot, but I guess that's what you want for a very 'tubey sound'. The ECC83/12AX7 may not work at all at such low voltages, however. (It might work- worth a try)

benproiii 19th September 2010 07:39 PM

what if i use a 100v b+ with 10k b+ resistor and 12v heater supply

will it work then. what will the gain be

Merlinb 19th September 2010 07:41 PM

Quote:

Originally Posted by benproiii (Post 2308289)
i don't have the ecc82 i only have a 12ax7

It's a simple enough circuit to try, just to see if it works, before making a final version.

Frank Berry 19th September 2010 07:45 PM

100 volt B+ supply would be much better with a 12AX7.

807tubenut 19th September 2010 07:45 PM

http://www.sincitytrader.com/upldr2/...PLEPREAMPS.pdf






I have tested the first schematic quite a bit at my office (blackberry preamp) on voltages ranging from 12v to 250v, 12v distorts to much for my taste! 50+v is where it works best.

benproiii 19th September 2010 07:48 PM

is there a way i can use 1 12ax7 for both channels and still have not much gain

benproiii 19th September 2010 08:06 PM

can i use the 12at7


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