Burman Pro502 guts, somewhat modified.


Even the flightcase didn’t save this one from UPS. Chassis is loose, the bolts pulled right through the sleeve, and the rivnuts broken loose, meaning the bolts just spin but are retained. Had to push them all the way thorough the sleeve, then address the oversized holes later.


New transformer in there and the reverb connector is removed and replaced with an XLR on the back presumably for an external unit.


Another view of the guts, showing the wiring for new transformer. No HT fuse in these puts the PT at risk.


Other end of the chassis.


Detail of the reverb mod. Now I’m thinking maybe a DIN rather than XLR but I put it back in flightcase and put stuff on top waiting for a rivnut tool showing up.


Burman Pro502 combo guts




Massive parcel arrived today, caught me just before leaving:



Guts not as tidy as the others. The middle filter cap on the left is free floating, so stuff needs doing. Not gonna have a chance for a while, tons else to do.


Impedance and voltage selectors banked off. Not sure why, or how original that is, general impression this amp has had a rough life on the road.

Buman Power Pak PA preamp and Slave amp


Modular rig, you can also get instrument preamps and chain as many of the power amps up as you require.

This one came without valves but had work done fairly recently:


Preamp photo was a bit blurry,, can’t tell from camera screen, and I’ve put it together again now:

pre guts

Solid state board runs the reverb. All but one of the pre valves in there were duds. Since two other of these have both required new pre valves when I’ve gone over them, have a suspicion something in these is eating them, but don’t know what. Pointers would be appreciated. On first try the reverb knob just gave a nasty whistle. tapping stuff with a chopstick to try and find it, and a good ding on the reverb tank ‘fixed’ it. Not the issue won’t recur, so guess have to call it fixed.