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Old 3rd August 2012, 10:03 AM   #1
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Default WTB Borbely DC100 PCBs

I had a pleasant surprise the other day. I found in my storage room nearly all the parts to build a pair of Borbely DC-100 or DC-100A amps. I think I collected these parts more than 20 years ago, then, during a household move, forgot about them.

Anyway, I do not have the Old Colony PCBs that used to be available. Before I go etch some, I wonder if anyone here might have a pair of PCBs that never got used.

Dave
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Old 3rd August 2012, 10:31 AM   #2
prakit is offline prakit  Thailand
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Borbely's DC100? Oh my...that was Erno's good old design from, as you said, more than 20 years ago. I am using a pair of all-FET Mill75 amps built 3-4 years ago. Besides heating up my room very quickly, they are great amps.

Nice to hear there's an old fan of Borbely Audio in Thailand. Good luck with your DC100 PCB.
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Old 3rd August 2012, 11:38 AM   #3
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I am also using a pair of all-FET Mill75 amps.

I'm gald to hear Erno have fans in Thailand.

Felipe
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Old 4th August 2012, 08:27 AM   #4
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Hello K. Prakit,

It's nice to see another DIYer here from Bangkok. What is the Mill75 amp? Google doesn't seem to return any reasonable results.

Dave
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Old 4th August 2012, 12:51 PM   #5
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Mill75 amp = Millenium 75W RMS class A mosfet mono amps
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Old 4th August 2012, 01:19 PM   #6
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Ahh! Thank you! It is a more recent Borbely design. Probably even better than the DC100. It might even be a good furnace for a home in Iceland. Really, though, I am intrigued. I will research this more.

Quote:
Originally Posted by merlin el mago View Post
Mill75 amp = Millenium 75W RMS class A mosfet mono amps
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Old 4th August 2012, 01:53 PM   #7
prakit is offline prakit  Thailand
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Yes, it's EB's last evolution of his design. All active devices were FETs(Jfet and Mosfet). Using JFET for second gain stage made big differences on tonal balance and resolution.
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File Type: jpg mill75.jpg (142.1 KB, 228 views)
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Old 4th August 2012, 04:57 PM   #8
GaryB is offline GaryB  United States
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Quote:
Originally Posted by dhalbakken View Post
I do not have the Old Colony PCBs that used to be available. Before I go etch some, I wonder if anyone here might have a pair of PCBs that never got used.
Dave,
Look what I found in the garage. A couple of DC100 boards with AH5020 and NPD5565 input devices but otherwise close to unpopulated. If you don't need the input fets then I might remove them for use in another project. Let me know what you want to pay and I'm sure we can work out a deal.
Thanks,
---Gary
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File Type: jpg DC100_boards.jpg (172.4 KB, 217 views)
File Type: jpg DC100_back.jpg (290.0 KB, 210 views)
File Type: jpg AH5020_NPD5565.jpg (188.2 KB, 202 views)
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Old 5th August 2012, 09:30 AM   #9
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Gary, I'm amazed! I will contact you privately.

Dave
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Old 6th August 2012, 04:34 PM   #10
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I was able to find more information about the Millennium 75 (and the Millennium 200) using the wayback machine to look at Erno's website a few years back. It looks as if Erno never published any information that a earnest DIYer could use to build the amp other than through a kit purchase. Is that right?

If that is wrong, I'd love to see the schematic fleshed out with real parts values and see if I might be able to reproduce it for myself. Is more complete information available anywhere?

Dave
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