Thanks for the transformer recommendation Mike. I'm currently assembling a 2N2/20 from a kit, but am hoping to do a 2N2 scratch build afterwards, if I haven't burned myself out by then! With that in mind, I bought 3 x 42TU400-RC from Mouser but was a little disappointed when they turned up, as they are bigger and heavier than the transformer used in the kit version. Will look into your recommendation.
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Alan - Dan's Small Parts and Kits has the MV1662. The ordering process is a bit of a pain, as you have to write out your order and mail it to him with a check or money order. It's worth calling him first, to ensure he actually has it, as sometimes he will substitute other parts without saying anything. Hopefully someone else knows of an alternative supplier for the MV1662, or has a suggestion for another varactor with similar properties.
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I'm planning on following the schematic of the Norcal version of the 2N2 for my scratch-build, as I figure it's the most optimized version. Mine doesn't have to be all 2N2222's. I even used a 3 terminal regulator device in place of the zener in mine *shock horror* :D I do plan on making the crystal filter in mine variable bandwidth, as in the 2N2/40+ though. I wish the kit version had that.
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I'll be following this, and other 2N2 threads, with interest.
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Dave
AA7EE
