AETHERPHON, global theremin family

Here are some sound samples of my Keppinger theremin, and my RCA theremin through the same loudspeaker (Low cost 10 inch polypropylene in an infinite baffle), with the same microphone and position (EV-RE20 at about 12 inches from speaker), recorded at 44.1khz, 16bit, converted to mp3 at 190kbps.

When I first powered up my RCA I was surprised to get no sound.  I haven't had it on in a few months (shame on me).

I found one of the type 27 tubes not working.  I've got a box full of tubes, so I tried several combination of 27 tubes, as these have been noted for changing the timbre of the RCA. 

Indeed they do, as evidenced by the R samples.  

The Keppinger emits a strong tone within about 45 seconds after power up.  It is pitch stable within 3-5 minutes.

Steven Hasten built the Keppinger, and restored the RCA, so he tuned both to his liking.  Both are capable of producing pitches above what they are designed to, and when played too high generate birdies (spurious tones).  I believe that is a function of how he tuned them, and I have not tried to resolve that.  I like the extended range, even if it is with artifacts (they're kinda fun, and start above the normal pitch range).

Keppinger
http://home.comcast.net/~pinballic/K1.mp3
http://home.comcast.net/~pinballic/K2.mp3

RCA
http://home.comcast.net/~pinballic/R2.mp3
http://home.comcast.net/~pinballic/R3.mp3
http://home.comcast.net/~pinballic/R4.mp3
http://home.comcast.net/~pinballic/R5.mp3

There may be some sympathetic vibration heard from various objects in the room as the tone reaches their resonant frequency.  I tried to keep it at bay.

bret