Hi Bluey,
ummmm... frequencies, huh? I'll have to ask 'Electro-mechanic' about that later on. It's about 6:30am here now, and he just emailed me that he has a dentist appointment this morning. He should be back around noon-time.
I know it's nighttime down-under now, but I can't find my time-conversion chart at the moment. Really, I have one someplace around here! LOL
I'm pretty sure we don't have any worthwhile numbers for you, at the moment, because that 'test' didn't bring any great success. There were some very tiny bubbles (thank you, Don Ho) coming out of the tubes, but 'E-m' was not very happy with the lines on his oscilloscope and other meters on his bench.
I believe the biggest problem at this time is no amperage reading on the meter, and the 3 diodes in the heat-sinks are not even warm, with 35 volts (I think) running.
He said yesterday, that he was going to start 'populating' the second PWM3E board that we got. Not sure why at this moment.
And since I'm not really doing any fabrication at the moment, I'm thinking and sketching our Version 2 cell. ...MUCH bigger! LOL
...more added to out 'Project pages' as they happen!