a good one . . .
I've had this since I was a child some 30 years ago and always looked after my things.
The PSU was professionally upgraded internally to output 21v by Comtec in Macclesfield 29 years ago.
One of the photos shows the standard Electron power supply! When I pointed out to the seller that the Voltage may (?) have been changed the Amperage most certainly couldn't have been, in the same package - the reply I received was:
It was modified by professionals who know exactly what they're doing.
I've been using it on and off for the past 25 years and had no issues at all, I think that says it all.
Who could argue with that
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com