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Old 19th June 2003, 03:15 PM   #1
Joel is offline Joel  United States
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Default Soundcraftsmen amps?

Hi all,

I inherited a Soundcraftsmen PM860, "Phase Regulated Switching Mosfet Amplifier" years ago, and have used it now and then inbetween tube projects. It's good sounding to my ears at least, except for the fan noise.

Anyone else own one of these, or have any info? I'm not a solid state guy, and I can't find anything on the web regarding them. I think it's from the late 60's or early 70's...

Thanks!

Joel
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Old 19th June 2003, 03:36 PM   #2
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got a pic of it????.....I dreamed of owning one years ago LOL...they were suppose to be real power houses!!!
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Old 19th June 2003, 04:02 PM   #3
Netlist is offline Netlist  Belgium
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I got one! But it's a RA7501. Fanless. Class H. 750WRMS Bridged.
It's working well when the protection circuit is disabled.
The problem is in the prot-circuit itself. As I also don't have a schematic I'm unable to fix it.
There a site here you can order schematics from theses amps:
http://www.compufind.com/schem.html but I still hope someone over here has it.
Pics are for JOE!

/Hugo - likes to make people dream...
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Old 19th June 2003, 04:03 PM   #4
Netlist is offline Netlist  Belgium
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Inside
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Old 19th June 2003, 04:08 PM   #5
Netlist is offline Netlist  Belgium
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Only numbers on the output transistors.

Here's another site but they don't list the one you have:
http://www.rangeraudio.com/manuals3.htm
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Old 19th June 2003, 05:08 PM   #6
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Thanks Bro!!!!!....you got me droolin all over my Damn keyboard...hahahaha

Cheers!!!!!!!!!!!!!!!!!!!!The DIRT®
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Old 20th June 2003, 03:35 AM   #7
EKG is offline EKG  United States
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I have a pair of the PCR-800's they date from the mid eighties. nice clean brutes. One of them is starting to have a show its age. I think a capacitor transplant is in order. If anyone has a schematic I'm still looking for one.
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Old 21st June 2003, 04:17 PM   #8
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Netlist I have an idea on what those transistors are 2n3773...160 volt....very popular in that era for high current amps


DIRT®
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Old 21st June 2003, 04:25 PM   #9
Netlist is offline Netlist  Belgium
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Joe,
What makes you think that, besides popularity?
If you're right they could be replaced by MJ15015!
Also, why is Sound-smith talking about mosfets.
Looking at my amp, the output transistors look very much like the K135 series.
I will take one out and measure it when I have some time.
/Hugo - Too bad there is so little info on such nice amps
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Old 21st June 2003, 04:30 PM   #10
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I have a clone of one so thats why I think that...you could replace them with a newer type...just make sure you replace all of them as you surely know....I replaced the high voltage driver transistors on mine too

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