This isn't so much construction as resurrection....
The story began with the theremin tumbling from its stand... I thought little of it, as the chip in the case was the only visible damage.
Next time I plugged in, the tuning was off, so I whipped the case off, adjusted, (worked nicely) then re-fitted the case. With the case fitted, the pitch was off, so again; off, adjust, replace. After repeating this proceedure a few times, I noticed the setting screws in the variable inductors were feeling a little "scratchy" .... Before they refused to turn entirely, and crumbled.
Now, I assume the variance in pitch with the case off is attributable to the partial demise of the inductors, (or perhaps proximity of components after the fall?) and that having replaced them, the beast will live again.... Snag is, I've no idea of the value of variable inductor that I need. (the script on the casing of them only gives a part number)
Any ideas?
Thanks.
John.