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Old 17th September 2012, 06:17 AM   #1
ChrisA is offline ChrisA  United States
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Default looking to build a "classic" tube compressor

I guess this is a line level device. It's not for playback but recording gear...

I'm looking for a "classic" tube based compressor-limiter with adjustable attack, release and level. This will go right after a microphone preamp. If I can find schematic or a detailed enough description I'll build one.

I know the basic theory. Many of them used an LDR or Light Dependent Resistor. The light source was controlled by some kind of adjustable signal level detector. But the "art" come from all the details, best to emulate something that is proven.

pointers, links and google search terms welcome.

Thanks.
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Old 17th September 2012, 12:07 PM   #2
flg is offline flg  United States
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I think you might like to try a search on the Faichild 670? IIRC
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Old 17th September 2012, 01:41 PM   #3
flg is offline flg  United States
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Maybe these will explain:
BAVO DEKKER vintage audio equipment
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File Type: jpg Fairchild 670 Limiter.jpg (297.4 KB, 80 views)
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Old 18th September 2012, 11:52 PM   #4
morinix is offline morinix  United States
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If you want LDR based compression AND tubes then the Teletronix LA-2A is the classic to start with as, at least, a reference. http://www.underthebigtree.com/keyboards/diyla2a.html

If you want to go Vari-Mu then that is a harder road. To make an exact Fairchild is nearly impossible because the 6386 tube is hard to find. I think JJ did a run some time in the last ten years or so but I don't know how good they are or if there are any left. This leaves one with having to triode-wire remote cut off pentodes. It has been done but I don't know of any web info on this.
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