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Old 28th May 2014, 08:26 AM   #1
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Default Simple power supply for 12Ax7 buffer tube.

Hi all,

Need your expert advise on building a power supply for a single 12au7 tube to function as a stereo buffer.
Would appreciates if can advise with schematics and component values.

Thanks..
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Old 28th May 2014, 09:07 AM   #2
SY is offline SY  United States
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Three necessary questions:

What do you mean specifically by "buffer"? That's a standard engineering term which has become ill-defined by EBay.

12AU7 or 12AX7 (you used both numbers and they are VERY different tubes)?

Schematic?
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Old 28th May 2014, 11:54 AM   #3
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Hi SY,

Thank you for your prompt reply.
"Buffer" meant signal from source i.e CD player into a preamp circuit with a 12AU7 tube.
Intention is to get a "Tube like" sound after amplification via a class "t" amp.
Please forgive me of my ignorance..
Any help with the PSU would be most appreciated.

Thank you.
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Old 28th May 2014, 12:04 PM   #4
SY is offline SY  United States
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Gain? Topology? This is important stuff to know before you sit down to design an appropriate supply.

By "tube sound," what do you mean? It's a very vague term that seems to mean different things to different people.
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Old 28th May 2014, 12:20 PM   #5
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Dear SY,

Thank you for challenging me in my approach.
I will research more and post in here ASAP.
I do not really need alot of Gain.
"tube sound" meant sounding nearer to an actual tube amp rather than a Class "T" amplifier.
Hopefully SRPP or Mu follower can give me a more tube sounding output.

Thanks once again..
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Old 28th May 2014, 07:22 PM   #6
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Ich wrote something related here:

wich is more suitible for a class D amp

90V were done via MAX1771 boost-converter.
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Old 28th May 2014, 08:31 PM   #7
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Quote:
Originally Posted by hschaser View Post
Dear SY,

Thank you for challenging me in my approach.
I will research more and post in here ASAP.
I do not really need alot of Gain.
"tube sound" meant sounding nearer to an actual tube amp rather than a Class "T" amplifier.
Hopefully SRPP or Mu follower can give me a more tube sounding output.

Thanks once again..
You are unlikely to get the "tube" sound with one tube.
The "tube" sound usually comes from an amp as a whole including output transformer.
I have built solid state amps with front end SRPP and it still sounded solid state.

You might get somewhere near if you can cause the tube stage to distort a bit to get a warmer sound.
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Old 28th May 2014, 08:51 PM   #8
DF96 is offline DF96  England
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Perhaps a 12AU7 cathode follower running from a +12V supply rail would generate sufficient distortion for nice 'tube sound'?
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Old 29th January 2015, 08:15 AM   #9
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Default inverted signal

Hi all,

i had completed a 12VDC powered 12AU7 preamp.
when I feed in a 1 K sine wave on the output end i get an inverted sine wave.(on my scope) Can any one pls advise is it normal or i had made a mistake in my circuit?
Attach is the circuit.
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Old 29th January 2015, 08:24 AM   #10
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https://dl.dropboxusercontent.com/u/...C%20preamp.jpg
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