Never heard of it, never laid eyes on one!
In fact didn't know they made an amp!
But, I'd take a look at the amp and compare it to those other 572b/811a amps and mods that are out there already. It's got to be rather similar.
The Collins, Heath and Gonset come immediately to mind.
As far as parasitics there are two main schools of thought one is the Rich Measures and the other was mentioned on here earlier this year, and may be linked either here or on Amwindow's tech pages - that one is based on making an LC supressor instead of an LR supressor. I've also seen where a large chunk of ferrite is placed adjacent to the tube, fwiw, and it is said that this works too. All of this is on the web somewhere!
You may already be aware of this stuff...
If you happen to find a schematic and post it up here, perhaps a few will come up with some thoughts?
Hey! A jpg of the beast, inside and out might be kewl to see!
_-_-WBear2GCR