Claravox Centennial- known issues, bugs and quirks

Hi,

I am new here. I have owned a Theremini for over a year and last month took possession of a long-ordered Claravox Centennial. 

The two instruments are chalk and cheese in terms of consistency of control.

I have spent most of my time on the Vox exploring "traditional" (analog) and must admit to goose pimples when the first waves of silky smooooth bass rolled over me - lovely tone indeed and so much more controllable. I have only briefly dabbled in "modern mode", but in traditional mode love the linearity of the pitch field (remembering I am coming from Theremini territory). Initially intimidating, I am getting used to the front panel knobs of the Vox, noting they are encoders rather than potentiometers. By the sounds of it my order arrived fairly quickly (4 months), but am really happy with the sound, feel, and control it affords.

I spent a while playing with the Theremini editor, it is loads of fun and affords a lot of control for creating effects and different noises - I see the Vox has an editor also, and it looks even more feature packed, but that can wait until I am better at traditional mode. I have no other theremin reference, so cannot compare it to anything but the Theremini.

I look forward to exploring the forums further.

I'd like to go back to earlier messages of this topic, about Claravox ghost tones. Starting here.
(May be this subject deserves a special topic)

I recently noticed the same kind of ghost tones with my Claravox.
I realized yesterday that it happened only when I played with my amplified loudspeaker.
No ghost tones at all when playing with earphones or with my old Sony HiFi stereo.

I made a test, using both earphones and loudspeaker.
The ghost tone is present.

I muted the loudspeaker (volume control at zero) but left it under power.
The ghost was still there, in my earphones.

I switched off the speaker. The ghost was gone.

The speaker is a Omnitronic WAMS65-BT.
The majority of this kind of speakers uses class D amplifiers (switching amplifiers), with a switching frequency of 100 kHz to 1 MHz.
I suspect the switching frequency to be close to that of the Claravox pitch oscillators and to produce the ghost tones.
So, I'm looking for a good loudspeaker with a class A or AB amplifier.
Not easy to find !