I reckon it's not that difficult to produce your own as you can etch the vanes and cut acrylic ends out and assemble them onto threaded rods spaced with nuts/washers. I also spent some time last night designing a new air variable. Probably why air variables command so much money! The photos are a representative sample of item. I'm not sure what dielectric they use but I've found it crumbles a bit after a few years. Unused, taken directly from manufacturers box, miniature plastic polyvaricon variable capacitor. The transformer was beyond my reverse engineering capability then and i proceeded to connect the mains to the 6.3v secondary which filled my nan's kitchen up with smoke in about 3 seconds flat.ĭue to a gap in interest in the early 1990s I got rid of it all for some silly reason.īack on topic there, I'm going to go for new ones this time as the older ones seem to be a little flaky. Brand: n/a Colour code: brown / transparent Control knob: 40mm round (screw included) available HERE Description: manual adjustable variable capacitor / mica dielectric Condition: new Manufacturer code: n/a Ordering code: VC-1 Grid: 5x5. Got copper wire, ferrites, IF cans, inevitably dodgy germanium transistors, audio transformers and speakers all for that money! I remember coming back having spent about 80p with two valve radio chassis, 5 pocket radios and a transformer that weighed about 3kg. The circuit uses a 20 to 160 pF polyvaricons variable capacitor and a T-50-2 core wound with 28 turns of AWG 24 enameled wire for the secondary winding. Dimensions: 20.1mm long x 15.7mm wide x 16.6mm high, including adjustment screw and bottom terminals. Pocket radios was where I used to steal them from years ago.

Polyvaricon variable capacitor