JJ Float QA seems to be good.
I am very interested in it.
I have an old electrostatic jecklin and am not too happy with it.
It has a very rough sound, not like an electrostatic.
I think it is probably due to sponge loss or amp matching issues and not the original sound.
A well refurbished old ’70s or ‘80s Jeckin “JJ Float
Elektrostat” (as they were called) can be quite good, clearly in STAX SR-009 territory, except for the bass extension.
Unfortunately the effort for refurbishment by far passes simple foam replacement, as usually the driver element has lost conductivity to the point where the sound is weak or distorted.
Their construction bottle neck always was the so called “Float PS”.
The designers were well aware of this, so they introduced six or more PSU versions over the time.
The latest iteration is quite good too, but by no means reaches what QUAD achieved with their “Float QA power supply”.
I have a fully refurbished ’80s “JJ Float Electrostat” with it’s dedicated latest PSU version.
Due to their different, proprietary connectors I can’t easily try it on the new “Float QA-ps”, said to bring them forward too, which is undoubtedly.
My best advice is, before spending significant money into refurbishment of an old one, beyond re-foaming, the new Float QA might be the better invest, as it clearly tops the old model.