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Audio Sector LM3875 Classic Dual Mono with Pass B1
Audio Sector LM3875 Classic Dual Mono with Pass B1
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Old 29th June 2013, 12:17 AM   #1
jdsalinger is offline jdsalinger  United States
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Default Audio Sector LM3875 Classic Dual Mono with Pass B1

This is an integrated classic dual mono Audio Sector LM3875 chip amp housed in a vintage Pioneer SA-600 amp case.
Integrated, because also inside is a Pass Labs B1 buffer pre-amp.

This amp has a great vintage Pioneer look. Transformers are (2) 22-22V 160VA Avel Lindberg toroidal.

It has 2 inputs and A & B speaker outputs. A posts are quality Dayton Audion posts. Currently the B speakers are disconnected because I didn't use them enough and I wanted to keep the output leads as short as possible. You could easily reconnect them if desired.

No tone controls.

It has been in my main system for about 2 years and it has run very cool, dead silent and performed flawlessly.

I'm asking $199. Buyer pays shipping. I accept paypal only.

Thanks
Brian
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Old 29th June 2013, 12:25 AM   #2
wireswithgain is offline wireswithgain  United States
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very cool, any shots of the inside?
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Old 29th June 2013, 12:46 PM   #3
jdsalinger is offline jdsalinger  United States
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Sure thing!

By the way, I didn't sacrifice a working Pioneer amp for this project. It was on the fritz and I liked the champagne look of the front face. Very classy.

The heat sink for the chips is a section of 3/8" thick aluminum angle, and it does its job well. This is a very cool running amp.


I've seen amps that were wired a little bit more tidy than mine, but I've seen some that look like a bird's nest too.

However, you can see that attention was given to short wiring lengths, separation of power supply and amp side. I also made a reasonable attempt to twist signal and AC leads. But like I said, it is dead quiet, so the wiring is adaquate.

Cheers!
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Old 29th June 2013, 01:07 PM   #4
lanchile is offline lanchile  United States
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it looks very nice!. Too bad you never try it with bigger power supply
Those 10uf caps are way too small. I build these kits long time ago and the sound was FLAT using those joke 10uf caps in the power supply...as soon as I put a few 10000uf the sound came alive I bet, if you try using at least 10000uf per rail, you will not sell it
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Old 29th June 2013, 01:50 PM   #5
jdsalinger is offline jdsalinger  United States
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If I don't sell it, I will try that. I've read good and bad things about the 10000uF caps. There is some debate. Some who tried them said that they couldn't hear a difference.

Your advice is exciting though. So all one would need to do is substitute the 10uF for 10K uF? That's it?
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Old 29th June 2013, 01:54 PM   #6
jdsalinger is offline jdsalinger  United States
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This is a nice amp and like you said, it has some potential. The reason I'm selling is that I have 3 amps (not much by some people's standards) and the other two have sentimental value to me. And I need some money for a speaker upgrade.

I wouldn't be too disappointed if it didn't sell though. = )
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Old 30th June 2013, 06:51 AM   #7
wireswithgain is offline wireswithgain  United States
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wow, beautiful. definitely worth your asking price, good luck!
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Old 30th June 2013, 11:20 PM   #8
nige2000 is offline nige2000  Ireland
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pm sent
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Old 1st July 2013, 12:14 AM   #9
jdsalinger is offline jdsalinger  United States
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Quote:
Originally Posted by wireswithgain View Post
wow, beautiful. definitely worth your asking price, good luck!
Thanks for the kind words.
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Old 4th July 2013, 08:59 PM   #10
jdsalinger is offline jdsalinger  United States
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Sold!
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