I'd be interested in the schematic for any of  their 40w+ CO2 laser transformerless(no ferrite core)  amps like this one:
/>I used to fix their lasers 12 years ago and i remember that kind of amplifier being their last embodiment which blew me away at the time.Looks like their RF manufacturer is alpha telecom apparently doing the amps for yaeshu...I'm not knowledgeable in rf field although i used to have a HAM radio operator licence, but i'd like to learn a bit more on that.

For a week i am gathering data and shared experiences about this ascillators that most people call Royer converter , even the Mazzilli converter was called a Royer one ... but the thing is that the only places i found  that clearly claimed a  difference between them are these ones:
https://en.wikipedia.org/wiki/Royer_oscillator
http://www.sophia-electronica.com/Baxandall1959JM.pdf
https://patentimages.storage.googleapis.com/33/30/c3/37a4e97853a657/US2783384.pdf

From what i can see None of them are the actual  circuit used in usual CFL or CCFL inverters as described in Jim Wallace Linear technology app notes.. The Royers were using PNP transistors and split feedback coils while the original Baxandall had split feedback coils for the bipolar transistor bases too, LC resonating tank and . From what i could find up until now it looks like the actual Baxandall-Royer circuit is actually the creation of Jim Williams as described in LT app notes and the book of Bob Dobkin and Jim Williams, but i might be wrong too...

So i created this subject just because google might send the curious people right at the beginning of these converters and possibly set the right pace for develloping a project. I am investigating myself the Baxandall inverter as i need it for some tube preamps and already experimentally built about 5 inverters by now in order to get the unregullated right voltage and the current i need.For the moment i couldn't exceed 10w of power from my gapped  cores although i tried huge nonsaturable cores and 150Mhz 100watts  transistors....and i just found this new forum yesterday so i'll probably need to read and build a lot more transformers to understand exactly how i can get higher power from a Baxandall inverter.
For the moment i am really glad i found you and hopefully i'll be able to get more advice on how to build a better Baxandall inverter.I was first considering the Mazzilli version as it's used to deliver huge powers, but Baxandall inverter looks bullet proof as compared to Mazzilli, the transistors are stone cold while working at any load  and i measured and visualized the waveform of a baxandall in many variations and it never blows the transistors no matter what happens with its 12v supply .
I am not looking at more efficient ways of building a high voltage resonating smps as i established my strategy already .
A tube amp needs a 6.3 ...12v fillament supply so i'll probably be building a 12v resonating supply based on a dedicated IRS chip and from that voltage i'll get also the high voltage through these Baxandall inverters as the high voltage doesn't need regulation. Unfortunately my contry's power grid is 220v ac 50hz and i don't own transistors with higher voltage than 1000V CE to try an off line baxandall  or Mazzilli  converter as i saw that some of you did from the 110v ac 60 hz US power grid.Also, if i'd need to controll the high voltage, i can simply use some LT1180  to drive the Baxandall-Royer circuit as JW indicated in his app notes.

For the moment i am really glad i found you and hopefully i'll be able to get more advice on how to build a better transformer for these Baxandall inverters. I only tried litz wire 7+7 turns primary and lots of variations of secondary turns, just no separate windings for the secondary yet , with various cores and gaps, but , as i said i couldn't exceed 10w of power  while the sinus had some better, some worse secondary resonating peaks.