Are you sure it's for audio? to me it seems more like a light dimmer or some kind of power supply regulator...
Or a massive PA amp? Has it any connectors?
Or a massive PA amp? Has it any connectors?
Giaime said:
No idea what it ws used for, got it from eBay for use on a massive amp. Right now these might go into a Krell KSA-50 clone.
Any ideas what the Thermal rating on these would be, I'd guess they can dissipate between 0.5kW to 1kW with a good fan.
They are a good 15lbs each or so. The connectors are on top via terminal strip. 2 large resistors mounted on the convection area. The metal cans are RCA types, all 4 quadrants are electrically Isolated. I am guessing one of these is good for a 150watt Class-A or 500 wpc class-AB amplifier.
And ofcourse could use some dipping into an industrial strength cleaner... they were probably stored for over 30 years without use.
K-
Attachments
Measure the heatsinks, use Rod Elliot's heatsink calculator or the more accurate one posted on DIYaudio and it gives you the rating without forced air.
With a regular vent used divide the number by 3, that should give you an close estimate on the heat resistance factor of the duct.
Resembles the original KSA50 tunnels, all right .
You could add solid copper plating.
My guess : somewhere around 0.10
With a regular vent used divide the number by 3, that should give you an close estimate on the heat resistance factor of the duct.
Resembles the original KSA50 tunnels, all right .
You could add solid copper plating.
My guess : somewhere around 0.10
This is most likely a part from a motor drive, variable speed drive maybe, or a DC to a (3 phase?) AC converter.
Tekko said:
Nah just resistors. The TO-3's are:
BENDI
3772 (I guess 2n3772)
MOT
3789
BENDI
2015-3
RCA
3772
The only other thing apart from the TO-3's and resistors is a Thermal breaker.
The big resistors are labelled:
12.5X 0.3
3% WL50 PPM
There's a sticker thats says:
DWG. 62-21-6088 REV.0
E.C.O. Heatsink Assy
Thats it...
It is some kinda linear amplifier, could be a driver for very big stepper/servo motor applications.
K-amps said:
DWG as in Drawing, 1962, week 21 , drawing 6088
E.C.O. as in Electronic Controller Output maybe ?
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