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Old 19th September 2010, 07:09 PM   #1
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Exclamation 12v B+ Tube buffer 12AX7

will this circuit provide A little gain but add tube like sound to my amplifier
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Old 19th September 2010, 07:16 PM   #2
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No. You will need a much higher plate voltage.
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Old 19th September 2010, 07:20 PM   #3
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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
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Old 19th September 2010, 07:29 PM   #4
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by benproiii View Post
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)
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Old 19th September 2010, 07:39 PM   #5
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what if i use a 100v b+ with 10k b+ resistor and 12v heater supply

will it work then. what will the gain be

Last edited by benproiii; 19th September 2010 at 07:42 PM.
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Old 19th September 2010, 07:41 PM   #6
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by benproiii View Post
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.
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Old 19th September 2010, 07:45 PM   #7
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100 volt B+ supply would be much better with a 12AX7.
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Old 19th September 2010, 07:45 PM   #8
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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.
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Last edited by 807tubenut; 19th September 2010 at 07:49 PM.
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Old 19th September 2010, 07:48 PM   #9
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is there a way i can use 1 12ax7 for both channels and still have not much gain
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Old 19th September 2010, 08:06 PM   #10
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can i use the 12at7
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