Tag: rca theremin

Beautiful RCA Theremin on Ebay

Restored a few years ago by Mr. Floyd Engels. See below for item description and photos. Find the auction here. Very rare RCA Theremin model AR-1264 from 1929. Very unusual electronic musical instrument from 75 years ago. About 500 of these units were produced just before the depression. This particular instrument had been professionally restored […]

RCA Theremin Service Notes

The RCA Victor Theremin

Preface The RCA Theremin is an electrical musical instrument played by the free movement of the hands in space. The actual production of sound is accomplished by means of a loudspeaker which must be connected to the RCA Theremin. The loudspeaker may be located close to the Theremin or at any convenient distance as required. […]

The RCA theremin – 2 – The Pitch Control System

The RCA Victor Theremin

The construction and operation of the RCA theremin pitch control circuit. This installment deals with the construction and operation of the RCA theremin pitch control circuit. The heart of the system is a large “pitch control resonant coil” (PCRC). The PCRC is the tall coil mounted the left side seen when looking into the back […]

The RCA Theremin – 1

The RCA Victor Theremin

Part 1 of a technical essay about the RCA theremin by Reid Welch. This is the first of several installments about the RCA theremin. Our goal is to promulgate enough data to enable the skilled amateur to build an RCA equivalent, and to make the circuit less mysterious to the non-technical person. Discussion and corrections […]

More Original RCA Data

The RCA Victor Theremin

RCA theremin technical notes written by Reid Welch. The RCA Pitch Resonant Coil Consists of more than a thousand turns of approximately 38 ga. ( B&S gauge) SSC enameled wire wound on a 12″ tall by a 2 15/16″ diameter, 1/16″-wall phenolic impregnated fiber tube. Winding length- 10 3/4″ DCR 445 ohms Z at 1kHz […]