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vnarchitect 9th May 2006 06:59 AM

12AU7 tube preamplifier schema
I need 12AU7 tube preamplifier schema. I have intend DIY a simple preamplifier with best quality.

ErikdeBest 9th May 2006 05:00 PM

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?

Alain Dupont 9th May 2006 05:12 PM


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"



Alain Dupont 9th May 2006 06:01 PM


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 goto: publication / preamplificateur

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

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

Alain. ;)

jmartins 10th May 2006 04:35 PM



pmonti 11th May 2010 03:21 PM

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...

mashaffer 12th May 2010 12:07 AM

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.

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