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
The speaker is a Jensen P10R (Alnico)
Here are some clips: