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12AU7 tube preamplifier schema
12AU7 tube preamplifier schema
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Old 9th May 2006, 06:59 AM   #1
vnarchitect is offline vnarchitect  Viet Nam
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Default 12AU7 tube preamplifier schema

I need 12AU7 tube preamplifier schema. I have intend DIY a simple preamplifier with best quality.
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Old 9th May 2006, 05:00 PM   #2
ErikdeBest is offline ErikdeBest  Switzerland
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12AU7 tube preamplifier schema
Hi vnarchitect

I see you are director! Very impressive, and that is probably also the reason you are also a very busy man, fact I recognise from 1 - you do not state what you need from your preamp, 2 - you did not perform a search at this forum or the internet to see the available schematics and 3 - that you don't know that best quality and 12AU7 hardly go together.

tell us, what do you want exactly?
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Old 9th May 2006, 05:12 PM   #3
Alain Dupont is offline Alain Dupont  France
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Take a look at John's site:


There is an Aikido for 9-Pin inputs / outputs 12AU7 etc

PS: I has done the pcb's also:

But you can also build one without pcb ; it's simple and of the "best quality"


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Old 9th May 2006, 06:01 PM   #4
Alain Dupont is offline Alain Dupont  France
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On the other side of the sea... The KTR from André Cocheteux with 12AT7 tubes...

There is a serie of articles in:

A SRPP praised of high level ; published in revue LED 182/183

http://isasarl.com/ goto: publication / preamplificateur

The upgraded version with 5725 tubes is of the highest level!
http://isasarl.com/ goto: publication / Optimisation

Even if this is a "french site" lot's of schematics are self explanatory.

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Old 10th May 2006, 04:35 PM   #5
jmartins is offline jmartins  Brazil
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Old 11th May 2010, 03:21 PM   #6
pmonti is offline pmonti  Argentina
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Default Valve Preamp 5725 Schematic

Hello, somebody have a nice 5725 valve preamp in triode mode? Thanks and Best regards. Maybee can put directly in EF86 design? im newby in valves. Best regards...
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Old 12th May 2010, 12:07 AM   #7
mashaffer is offline mashaffer  United States
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I thought he said simple. As I recall the original BH foreplay was a simple RC coupled CC 12AU7 and got pretty good reviews. No doubt the trick is in setting the proper operating point.
The only reason I drive the 91 Colony Park is that I can't afford a 65. Me old school? Couldn't be.
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