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
This is my first post here. Hope to enjoy the site!
Cheers!
Johnny
Here's a "Soldano" preamp. Those AX84's don't quite get there.
Soldano Preamp : DIY Fever – Building my own guitars, amps and pedals
Soldano Preamp : DIY Fever – Building my own guitars, amps and pedals
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-Tub...4506/ref=sr_1_1?ie=UTF8&qid=1338483622&sr=8-1
http://www.amazon.com/Designing-Tub...4506/ref=sr_1_1?ie=UTF8&qid=1338483622&sr=8-1
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.
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.
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
The Real McTube II
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?
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."
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."
I think not. I think he simply meant that there was no rectification in the heater supply... 😉
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