The first of the two MIDI converters has been tested OK with a 'scope.
It puts out pulses at the note frequencies and can handle 3 notes at a time.
(Converter kits are from, Eastern Voltage Research, in USA. )
On a speaker a chord sounds OK so should modulate sparks. Pulse width is adjustable.
Second one being made so 6 notes can be handled at a time (3 in bass and
3 in treble clef)
Spark size is reduced now as only one GU81 each creates them.
So, will knock up sometime, a trial full wave voltage doubler to increase EHT to each valve. As current availability is reduced doing this I am getting a 3rd MOT to give it all a shot in the arm....not my arm.
Still awaiting IXDD414CI drivers from China, recommended by, Al.
Running now before I can walk
...…..just created a MIDI file with all the notes on the piano running up the scale on alternate bass/clef. This should eventually show if both sets of sparks can handle it all and what range I should set the converters to.