Tube preamp pedal

[Hypnotize]

Hi there ,

I would like to build tube preamp pedal (i need only clean channel ) with 12ax7 tube .
Does anyone know some good tube preamp pedal , that i could build ?

Thanks a lot 

[Will.mendil]

The tube cricket is to try. Ordered the parts last week you can find the informations on beavis audio ' s site

[GibsonGM]

The tube cricket is to try. Ordered the parts last week you can find the informations on beavis audio ' s site

Great project to start with. I'd go for it.

[Will.mendil]

http://www.beavisaudio.com/projects/TubeCricket/

[Will.mendil]

I guess if you omit the 1750a transformer you can use it as a preamp. An add it for an amp. I am not sure what beavis says though

[Hypnotize]

wow , thanks a lot for your replay , I'm definitely going to build it .

Thanks once more 

[Will.mendil]

Please report your build as I guess we ll be making it together. Could you send me a mp when you get to start

[mth5044]

I don't think the tube cricket is clean at all, is it?

[Will.mendil]

Well if I understand correctly it is meant to be a tube preamp with a small IC "power amp" it goes from clean to overdrive. If you omit the power amp you get the tube preamp which could I guess be used alone. Beavis has another tube overdrive. But this one should definitely be clean but warm

[MaxPower]

If you want a battery operated circuit:

http://www.valvewizard.co.uk/links.html
Look for a pdf near the bottom of the page (Triodes at Low Voltages).

---
This is probably not very helpful but I'll post it anyway. In the July 2002 issue of Poptronics (RIP), there was a project called "The Tubester". It uses a 6F5 tube but you can use a 12AX7 if you want. This one is also battery operated (and similar to the one in the pdf above).

Maybe you can find it archived in a local library. I searched the web for it once. The only place that claimed to have it required the purchase of a subscription to see it.

Fun little circuit, one of my first builds. Goes from clean to distorted/crunchy. One of these days I'll get around to building another and trying some modes.

[caspercody]

I am looking for a clean head phone amp, and I just bread boarded the tube cricket.

I omitted the tone control, tube stage 2, and removed the gain pot and components from pins 1 to 8 on the 386. But this still does not give a clean amp sound.

I do not know what the voltage is suppose to be at bias point 1? But I did adjust pot in both ways, but could not get it clean sounding.

Could the impedance of the head phones be causing this?


Just using the 386 as a amp does give me a clean sound, but really want to add the 12AU7 tube to get that warm feeling.

Thanks
Rob