Power Amp Board Identification

[sidsparks]

Does anyone recognise this power board, if so do they have a schematic that they could post or e-mail.

Thanks

 

[djk]

Sorry, don't recognize it.

It does look interesting though. Three pair of MJ12522/23 outputs, one pair of the same for drivers. LDR limiter. Has been very poorly repaired at least once.

You could probably draw the schematic easily enough.

Looks to be about 400W/4R, running on about ±75V or so.

 

[poynton]

Is the label " The Hunter", the only marking ??

Andy

 

[djk]

" The Hunter"

Probably the guy that stuffed the board.

There is a similar "DC Test" sticker on the bottom left, another name on it.

 

[jaycee]

Well, whatever it is, it has totally had it.. PCB burnt in places, diodes fried, poor mounting of parts, those power supply capacitors look like they're past it too. Also as djk says, it's been very badly repaired at some point - probably why it has blown up.

Find out what the power supply voltages are and make something to replace it. There's going to be no repairing that without making a new PCB.

 

[darkfenriz]

LDR limiter

Where?

 

[jaycee]

Where?

If i was to take a guess, I would say it's that part to the right of the DIL8 chip on the board, in the first picture.

 

[Steve Dunlap]

That looks like a QSC from the early 80s. The board is all you have?

 

[llwhtt]

That's the power supply/amp board for a Crate PCM 6/8 powered mixer from the mid/late 80s.
I have the schematics and layouts in from of me, too large to scan though.

Craig

 

[llwhtt]

Sidsparks,

I have the schematic and layout scanned and ready to go, need your email.

Craig

 

[sidsparks]

Thanks very much.

My e-mail
sidsparks58@yahoo.co.uk

 

[sidsparks]

Craig, got the schematic and layout that you e-mailed.

Thanks very much.

 

[rgreene]

I know this is an old thread, but I'm in need of schematics and layout for a Crate PCM-6, and perhaps a thermal switch... Please send me what you have,and any help much appreciated.
rgreene@fairpoint.net

Thanks!

 

[tiefbassuebertr]

here a download aera for this schematic:
Diagrama/Manual Crate CRATE PCM-6+8+8D

 

[rgreene]

Thank you, but

Unfortunately, that site is in a foreign language (to me), and it is a pay site, so I think I'll wait to see what other sources come up....

 

[llwhtt]

You have mail!!!!

Craig

 

[rgreene]

Thanks Craig!

 

[Monsteranus]

I have one of these Crate units and Ive been looking for schematics for it.

The 1/4 amp fuse on the power amp board was blown. I replaced it and it did not blow but it has issues.

It seems to have an issue with the E.Q. portion. I can route the signal to the pwr amp in and it plays fine. Otherwise its a very crackled up sound. The effects send only produces a hum.

Any suggestions will be greatly appreciated!

 

[llwhtt]

Monsteranus,

Send me your email and you'll have the schematic.

Craig

 

[Monsteranus]

Thanks Craig!