Champ 5C1/5F1

Probably the best amp I ever built:). By coincidence I found an old 6SJ7 (metal penthode) tube in our local army dumpstore. I knew I had seen a schematic once before in the past. After some digging around I found the Fender(TM) 5C1 schematic. I had a bunch of old power and old output  transformers so I decided to build a small 5W amp containing the 5C1 AND the 5F1 schematic. The power transformer was from an old tube radio. The output transformer I got from an aquaintance who said this was a very good output transformer (and he was right). As for the rest, jus a bunch of old components I had. Made an experimental chassis to play around with and started experimenting. And damn it sounded great. So time to build a permanent version. Brother in Law made a chassis from zinc plated steel. Used a simple strip board for the parts. Used the cheapest poplar wood I could find. The grille is made from a left over piece of brass with a simple square pattern in it. Polihed it with brass polish and sprayed it with 4-5 layers of clear laquer. The cabinet is lacquered with 3 layers of boat varnish. The only thing that was most expensive was the faceplate (lasered).

Some pictures of the prototyping and finished product

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The speaker is a Jensen P10R (Alnico)

Here are some clips:

Clean 5C1

Full volume 5C1

Clean 5F1

Full volume 5F1


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