Guys, this pro PA amp. landed home, with a complete, missing output stage!...
I've looked everywhere, for even specs on those and, no joy.
This was aparently made in Quebec, Canada, but there are no man. date or address or anything else on the back.
It's a 600WPC rack mount beast, that's built like a tank Destroyer!...
Weights maybe around 60lbs, has forced-fan cooling.
Anybody knows this brand?!?
I've looked everywhere, for even specs on those and, no joy.
This was aparently made in Quebec, Canada, but there are no man. date or address or anything else on the back.
It's a 600WPC rack mount beast, that's built like a tank Destroyer!...
Weights maybe around 60lbs, has forced-fan cooling.
Anybody knows this brand?!?
That's a lot more than an output stage. Those 24 pin dip patterns look irreplaceable.
Depending on power transformer (should be +- 60 v) you should be able to stuff a honey badger board in there on aluminum angle and some heat sinks with fins aligned with the air flow from front to back. But that is only 150 Watts. Probably you have +-80 v.
I can tell you now, PV-1.3k, PV2000 boards won't fit.
Depending on power transformer (should be +- 60 v) you should be able to stuff a honey badger board in there on aluminum angle and some heat sinks with fins aligned with the air flow from front to back. But that is only 150 Watts. Probably you have +-80 v.
I can tell you now, PV-1.3k, PV2000 boards won't fit.
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TO-220 ? are you referring to the RHS photo ?
The smaller ones are more like TO-66 .
The bigger ones are early version TO3,s . (domed )
TO-3= 30mm between fixing holes .
TO-66=24mm between fixing holes.
I would put it no later than the 80,s --probably 70,s .
Possibly movie theater amplifiers.
Still trying to find the Quebec factory.
The smaller ones are more like TO-66 .
The bigger ones are early version TO3,s . (domed )
TO-3= 30mm between fixing holes .
TO-66=24mm between fixing holes.
I would put it no later than the 80,s --probably 70,s .
Possibly movie theater amplifiers.
Still trying to find the Quebec factory.
If you look at the center of the board, each side of this blue cap, there are those; JE340 JE350 and JE 182.
MJE340/350 are a On semi TO225 part that's been around for decades. Still in production. Good predriver. Download the datasheet from datasheetcatalog.com
Don't know about a MJE182
Well, at least the parts are all discrete transistors, resistors, capacitors.
Nothing exotic. You could trace the pcb artwork and copy it with a photo-etch process. Schematic black on transparent copier film. Disposing of the etch chemical legally is what keeps me from doing that. Only legal way, a 55 gal haz waste drum from Safetyklean, $450 down payment and $30 a month rental while you store it. Just handling a full 55 gal drum requires a forklift I don't have. To import a PCB from a vendor requires a eagle file, which means porting the layout to a computer.
But finding that huge heatsink with a flat in the middle, I don't know. heatsinksamerica doesn't list them I don't think. Plus accurately drilling four hole TO3 or even TO66 package patterns is beyond my skill with a hand drill motor. Drill bit tends to walk a bit in small sizes, go off the centerpunch location.
I suggest you look at the mains cap rating. 100 v is a tip off for +-80 or +-85 rails, which requires 5 pairs TO3 O.T. to last any time at full wattage - 600 it says.
Do you play a big enough audience to need 600 W/ch? I don't. I play halls of 80 seats sometimes, CS800x or CS800s is fine for that. I have a PV-1.3k 650 w/ch but I bought it for the price ($55) & learning experience. I don't have speakers that would use up all that. Just SP2 s, 600 w/ch music power but 300 w/ch RMS. I wanted a PV4c but one didn't show up locally in 15 years.
One problem with these big beasts, when something goes wrong the DC out can launch your speaker cones into the audience, or set voice coils on fire. I don't see any sort of triac to blow the fuse when DC comes out the speaker jack. The PV-1.3k protection circuit was the downfall. the crowbar triac would melt the PCB land off the circuit board instead of blowing the main breaker. Redesigning for a Michael Bean dual NFET disconnect circuit was a packaging problem I never solved. The CS800s had a DC disconnect relay, one that Sakis said was trustworthy. Those $5 speaker relay disconnects from alibaba, 55 amp would weld the contacts shut in a heartbeat. You could probably get 1000 amps out of a 10000 uf main cap through a shorted TO3 MJ15024. Hard contact relays are rated for AC loads, not DC.
Don't know about a MJE182
Well, at least the parts are all discrete transistors, resistors, capacitors.
Nothing exotic. You could trace the pcb artwork and copy it with a photo-etch process. Schematic black on transparent copier film. Disposing of the etch chemical legally is what keeps me from doing that. Only legal way, a 55 gal haz waste drum from Safetyklean, $450 down payment and $30 a month rental while you store it. Just handling a full 55 gal drum requires a forklift I don't have. To import a PCB from a vendor requires a eagle file, which means porting the layout to a computer.
But finding that huge heatsink with a flat in the middle, I don't know. heatsinksamerica doesn't list them I don't think. Plus accurately drilling four hole TO3 or even TO66 package patterns is beyond my skill with a hand drill motor. Drill bit tends to walk a bit in small sizes, go off the centerpunch location.
I suggest you look at the mains cap rating. 100 v is a tip off for +-80 or +-85 rails, which requires 5 pairs TO3 O.T. to last any time at full wattage - 600 it says.
Do you play a big enough audience to need 600 W/ch? I don't. I play halls of 80 seats sometimes, CS800x or CS800s is fine for that. I have a PV-1.3k 650 w/ch but I bought it for the price ($55) & learning experience. I don't have speakers that would use up all that. Just SP2 s, 600 w/ch music power but 300 w/ch RMS. I wanted a PV4c but one didn't show up locally in 15 years.
One problem with these big beasts, when something goes wrong the DC out can launch your speaker cones into the audience, or set voice coils on fire. I don't see any sort of triac to blow the fuse when DC comes out the speaker jack. The PV-1.3k protection circuit was the downfall. the crowbar triac would melt the PCB land off the circuit board instead of blowing the main breaker. Redesigning for a Michael Bean dual NFET disconnect circuit was a packaging problem I never solved. The CS800s had a DC disconnect relay, one that Sakis said was trustworthy. Those $5 speaker relay disconnects from alibaba, 55 amp would weld the contacts shut in a heartbeat. You could probably get 1000 amps out of a 10000 uf main cap through a shorted TO3 MJ15024. Hard contact relays are rated for AC loads, not DC.
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I was mostly wondering if there are doner amps or if you guys even know that brand?, there is absolutely nothing on the net regarding that amp.
Turboyam --I looked through Quebec,s electronic engineering data base ,no sign of that company but several larger companies have taken over smaller engineering companies but not all take-overs are listed .