EV CP500 schematic needed

[zero cool]

Looking for a schematic for an old EV CP500 power amp vintage 1977/78 or so. model might be cps500 i cant read the model clearly.

[Enzo]

CP500

My document inventory says I have it. But just where I have to determine. I'll search.

[zero cool]

CP500

My document inventory says I have it. But just where I have to determine. I'll search.

Thank you!

[J M Fahey]

I don't have the schematic, but, out of curiosity (I *did* repair one a *long* time ago), ¿is it the one with a zillion power transistors mounted on-board, each with its own little heatsink, where losing fan flow means instant overheating?
I also seem to remember it had some kind of "power control" where it actually varied the threshold of a hard limiter ¿was it optical?
They were *very* clean.
Post some picture.
What's the actual problem?

[zero cool]

I don't have the schematic, but, out of curiosity (I *did* repair one a *long* time ago), ¿is it the one with a zillion power transistors mounted on-board, each with its own little heatsink, where losing fan flow means instant overheating?
I also seem to remember it had some kind of "power control" where it actually varied the threshold of a hard limiter ¿was it optical?
They were *very* clean.
Post some picture.
What's the actual problem?

yup yup yup. lots of small heatsinks and there dynaguard i think they call it where you can set limiting to 62.5w 112W and 250w

One channel is burnt up. one channel works. I have been flip flopping between fixing this thing and chunking it in the trash. I can't imagine it has much resale value today. I need to figure out what the house numbers are on the transistors. thought it might be a good project for my jr tech.

[J M Fahey]

Forget resale value.
This is a keeper/user.
At worst, save the rack cabinet and power supply. You sure will need to add heatsinks. What +/-B does it have?

[zero cool]

Problem is i have at least 20 old dead power amps in my tiny shop at the moment. boards burnt beyond repair (mostly crest's) that i can use for chassis and lots of transformers of all sizes and shapes!! lots! so keeping "another" amp around for a project chassis just doesn't interest me. would LOVE to get rid of at least a dozen of what i already have. I have gotten to the point of just chunking stuff in the trash as i just don't have room for it and no one seems to want it!

I get $0.06 cents a pound for transformers and $0.02lb for sheet metal. $0.55lb for aluminum and about $0.60lb for circuit boards.

So this amp...working is maybe worth $100-150 i think so im on the fence about fixing it....on one hand a hundo is a hundo, but on the other, how much time and money in parts do i need to put into it to make that hundo....

You want it? make me an offer!

[J M Fahey]

Unfortunately we live 10000 km apart, or I would gladly pick those 20.
Board and components cost is nil, the real expensive parts are the chassis, power transformer, big caps and heatsinks.
Good luck.