Date codes found on components inside are from 1985/1986.
Came to me as non-functional (displays worked, but nothing else), turns out the display control has its' own board with its' own transformer.
The print transformer on the main (bottom) board had two cold and subsequently cracked solder joints on the primary coil.
It seems to be an upgraded P150-4, which I am assuming from the case, had only 4 transistors. The larger piece of the top cover is actually from a P150-4 with the Ampere markings and 150-4 designation crudely removed. Seems like the -4 was rated for 60V, 30A and 150W,
vs. 60V, 45A and 225W on the -6.
The 4 pots are individual settings that you can quickly switch in between, with #5 being external and "Seriell" being the serial port in the back.
Nice pots, btw, they even have a little locking lever on them.
The P-max allows setting a wattage limit, with an LED indicator lighting up when it's reached.
There is also what looks to be a Piezo Buzzer in there, that has a lighter shade of blue adhesive, seemingly being added at a later point in time, but not connected to anything. I'd assume it might have been connected to that LED indicator at some point?
Seen here:
Someone had been in there before, judging by the mangled bolt heads, burn marks from the soldering iron (de-soldering the mains input for the 2nd transformer for further disassembly) on the 2nd transformer and cracked glue/marker on the bolts inside, but seemingly hadn't dug deep enough to find the cracked joints.
Works a charm now.
The PCBs are about what you'd expect from a modified device (P150-4 was the standard unit, even the print on top that was scratched off, but is still sorta legible, used to say P150-4), from the 1980s, no complaints there. Bunch of bodge wires and extra components.
The wiring however...bit of a rats nest, no silastic or similar in sight, the flat cables to the displays were burnt (soldering iron?) and just got a bit of a touch-up with that blue adhesive.
But hey, only one wire was actually broken off, so I suppose it was good enough to last over 30 years, maybe I'm too strict there.
I'd be delighted if it lasted for another 30.
The white silastic and red-ish marker are mine, the blue stuff is original.
Took the photos before adding more silastic.
Overview:
Center stack of PCBs, lower being the main one, center is connected to the front panel controls (mostly), top connected to the two displays.
Power resistor and transistor group (6 in total)
Serial PCB
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