This project started because I alwayse wanted to do something with the 'octal' tubes I had lying around. As a kid I already played with ECC's, ECL's etc, but never with these type of tubes. So what is simpler than a 0V2 receiver to cover AM and/or SW? The receiver is a success, it is quite sensitive when it is tunes and operated (regenerate!) correctly. Apart from the high end of the AM and the 160 and 80m amateur bands, the broadcast stations around 3 and 3.9 MHz are loud and clear, and also some fax and/or weather stations. I have not yet connect the output to my PC (running for instance MIXW) to decode these. Also, DRM (Digital Radio) is appearing as loud noise. Can't do anything with this I suppose..

Top view. The coil, 40 wnd's on a 6V6-base is in the middle bottom, left to the capacitor. Behind the coil the 6X5 rectifier, in front of the transformer giving 4V, 6.3V and 2x250V (thanks Arie, PA0EZ). The 4V winding is not used. At the other side the 2 6SN7's (front and middle) and the 6K6 (or 6V6 if you want) output penthode giving lots of noise. The coil covers 1.5 .. 4.8 Mhz. The chassis consists of aluminium 1.5mm, 20x30 cms with 2 sides of 5cm bend, resulting in 20x20cm. The front is also 20x20 cm, with the main dial in the middle, the volume-control to the left of it and the generating control to the right.

The underside... I used only surplus parts out of my junk-box. Take care that you keep the 6.3V heaterwires (twisted green) as far away as possible from the audioleads. Also, a C of some uF's at the left, between the two tube sockets, removes the remaining 'hum' effectively. Just experiment with it..

The front, not yet showing nicely :-). Was a nice experience to listen to quite some stations joining the contest on 160m the first of march (2005)