Champ Amp, My First Amp

This was my first tube amp experiment. It is based on a Fender Champ from the 50's. The Champ was designed to be a cheap practice amp. It features all-tube construction, about 5 Watts of power and tone control!


The tone control is rather lousy. The signal path is as follows: The first stage of the 12AX7 is used as a preamp driving the passive tone filter, the second stage is used as the output tube driver which feeds into the 6V6 output tube. The tone control is a passive bandpass filter and it doesn't work very well. Technically, the amp was based on the Fender Princeton Model 5F2, but this just included a few upgrades over the classic Champ amplifier - two inputs (so you can practice with a buddy), the tone control and an inductor in the power supply filter. You can find the schematics below. The main upgrade I performed was the addition of a magic eye guitar signal detector. The magic eye dances while you play the guitar. I used a EM80/6BR5 type described on my Magic Eye page.

Here is the schematic:

Click here to check out all the construction pictures in the gallery.

Post new comment

The content of this field is kept private and will not be shown publicly.
CAPTCHA
This question is for testing whether you are a human visitor and to prevent automated spam submissions. Thanks.
Image CAPTCHA
Copy the characters (respecting upper/lower case) from the image.