My Tube Theremin

Hello,

Does anyone know, what model is it? Or from year is it? There is nothing written, there is written just "Delta electronics" inside and tubes are from Tesla. Has it any value, or is it just piece of... You know :-D
Theremin is well working, just the volume antenna is reversed-working. If you have hand near the antenna, it's louder...

Here is link of the image: https://ibb.co/9qdsDyG

Thanks!

Martin what you have there is someones homebuilt, one off, theremin design and very nice looking at that. What makes a theremin valuable in my opinion is the way it sounds and the comfort in its control. The difference in a theremin that sounds beautiful or fascinating is just five dollars in parts and a little bit of special knowledge that eludes most engineers.

As I always say "Demonstrate a sound byte or is it just a resounding gong or a clanging cymbal". That would impress one engineer and maybe others.

Christopher