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Old 23rd July 2008, 02:59 AM   #1
sonidos is offline sonidos  United States
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Default Schematic for Old Colony KG-5

Back in the early 90's I purchased this power supply kit from Old Colony Sound Labs to build Corey Greenberg's BUF03 preamp.

Anyone have a schematic for this Old Colony kit? It seemed to work pretty well in my preamp and I have the pcb in fairly good shape after I scavenged it for parts.

I'm thinking about using it in the B1 preamp and it would be nice to be sure I have the correct parts on the board.
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Old 25th July 2008, 08:47 PM   #2
sonidos is offline sonidos  United States
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Okay, I've seen some of you have viewed my post with no replies so maybe you have some interest on what I've come up with. I've done some digging around and I've written Old Colony.

They are looking for the schematic since it was discontinued several years ago.

What is clear is that it is nearly identical to the schematic that Corey Greenberg published in his Stereophile BUF03 article. I think their is only a minor difference on resistor values after checking CG's BOM and the board that I have.

The original kit specified 4700uF Panasonics and I have some Panasonic 6800uF TSHAs that I can drop on the pcb w/o problem. The only difference appears to be the resistance values. So the cool thing is that I can adjust voltage by swapping out resistors. The psu should output +18/-18 V, which I could use for quite a bit of projects.

Since the board has been sitting in a box in my garage for about 15 years, I'll probably swap out all electrolytics for good measure.

Hmmm...now where to use it....
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Old 28th July 2008, 10:35 PM   #3
sonidos is offline sonidos  United States
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Old Colony returned with this info:

the kit is based on the power supply designed by Gary Galo in the 4/90 issue of the Audio Amateur.

Now all I need is to pony up $5 for the mag and I'm in biz.
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