Looking for a fairly simple Hi gain tube pre amp project - diyAudio
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Old 31st May 2012, 05:00 PM   #1
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Default Looking for a fairly simple Hi gain tube pre amp project

I'm interested in a schematic and or complete plans to build a 12ax7 hi gain tube pre amp for guitar applications. My intentions are to stick something into a small chassis and use as a foot controlled pedal of sorts to drive my Fender Super Reverb made circa 67. I may perhaps build two of them to have a 2 channel clean, and dirty output.

This is my first post here. Hope to enjoy the site!
Cheers!
Johnny
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Old 31st May 2012, 05:39 PM   #2
Merlinb is offline Merlinb  United Kingdom
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Take a look at the projects at AX84.com - The Cooperative Tube Guitar Amp Project
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Old 31st May 2012, 05:54 PM   #3
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Here's a "Soldano" preamp. Those AX84's don't quite get there.

Soldano Preamp : DIY Fever – Building my own guitars, amps and pedals
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Old 31st May 2012, 05:56 PM   #4
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Quote:
Originally Posted by Merlinb View Post
lol, are you the "Merlin" mentioned in my link?
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Old 31st May 2012, 06:00 PM   #5
SY is offline SY  United States
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Although he was too modest to mention it, MerlinB is the author of a book that will answer your question and many more. Highly recommended.

http://www.amazon.com/Designing-Tube...8483622&sr=8-1
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Old 31st May 2012, 06:21 PM   #6
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Too cool.

There are lot's of sound clips for the AX84 HO online and a few sound clips of the Soldano at the bottom of the page I linked.
You can get a pretty good idea to the differences in tone by the videos.
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Old 1st June 2012, 08:24 AM   #7
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The Real McTube (Fred Nachbaur) might be of interest. I've built a couple of these as pre-amp boosters into my valve guitar amps. They sound great, as well as being a relatively simple build (with a lot of scope for tweaking).

The Real McTube II
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Old 7th December 2012, 04:14 AM   #8
Keysy is offline Keysy  United States
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I am no expert and it seems a bit crazy to question anything in the Real McTube but why does he bother to rectify the heater circuit? Can't I just run one secondary of the 12V AC to pin 4 and the other to pin 5/ground to supply the heater?
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Old 7th December 2012, 09:04 AM   #9
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Hum.

On Fred's page he actually states:
"This results in a significant reduction of AC hum as compared to the original "Real McTube", which used AC to directly heat the tube's filaments."
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Old 7th December 2012, 10:41 AM   #10
DF96 is offline DF96  England
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Instruments & Amps???
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