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Published on Jun 10, 2012
A newborn RCA 1264 Theremin Replica is tested by my 8 years old son. He has one of his arms in plaster, but that does not limit his fun :o). The Theremin was built by myself according to the original dimensions and circuits. The coils are new built and follow exactly the original drawings. The trimmer capacitors are compressed mica types. All hf-capacitors are mica types, all power supply and decoupling caps are paper types for military use - of course no electrolytics. The front and back of the housing is made from acrylics to show up the electronics. The tube types are a little bit different to the original: 37, 36, 37, 37, 2J27L, 1626, 1626 and 5Z3S. The use of 1626 for volume oscillator circuit improves the stability of the volume circuit. The 2J27L - which is "naked" and uncaged of its metal housing - substitutes the rare and expensive 120 with good success. The 37 is electrically the same as the 227 but more cheap and consumes less heater power - and I have many of them in stock. The 36 is a very good replacement of the 224 having nearly the same characteristic. So I could use all "coke bottle styled" tubes except the 2J27L. The interstage transformers are new built. Both chassis are made from stainless steel. Playing a Theremin is much more difficult than building it - at least for an engineer...