C/M Laboratories amps (and other gear)

dangus · 24th November 2006, 11:25 AM

I picked up a CM Labs CM920 power amp at an estate sale a while back. It needs some work... the power transistors had all been removed and stuffed in a plastic bag.

So far, I've copied the PCB layouts in CAD, and drawn up freehand schematics of the LED power indicator and amplifier boards.
It'd be nice to see a real schematic, or get some voltages off a working unit, if there's any out there.

This amp inspired me to start the Vintage audio wiki entry on CM Labs, mostly with information from Usenet posts, other forums, and old audio magazines:
http://www.diyaudio.com/wiki/index.php?page=CM+Labs

I'm also working on a personal web page where I'll post the CM920 "reverse engineering" info, and anything else relating to CM Labs products and the company. There won't be much to start with: a couple of photos borrowed from auctions, the 911T schematic, the CC-2 preamp review from High Fidelity.

Ed Coleman · 12th April 2007, 06:47 AM

C/M/Labs? I have a very well cooked 35D that I would love to get rebuilt, one of the circuit boards is absolutely scorched! Would you happen to have a schematic for it? I'm also getting a 911 at the end of the week, can't wait to get it cleaned up and power it up !
I did read the nice article your post was linked to , what surprised me is that it didn't mention the tube amps CM built. I have an email from a gentleman that claimed he had one of their tube amps back in 65-67 time frame. I'll dig it out and forward it if you like.
Please let me know how you're doing on your rebuild , sounds like quite the project ! Ed

dangus · 17th April 2007, 06:21 AM

I can report no progress on the CM 920 amp. The only schematics I've got are the 920 (sort of) and the 911T. It could be worth contacting Scott Dorsey http://www.kludgeaudio.com/ since he used to work for CM Labs in a technical capacity and see if he can help.

If one channel of the 35D is still good, then it should be possible to reverse engineer it and fix the other channel.

I haven't seen any other evidence of tube models, so please forward that email.

24th November 2006, 11:25 AM	#1
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	C/M Laboratories amps (and other gear) I picked up a CM Labs CM920 power amp at an estate sale a while back. It needs some work... the power transistors had all been removed and stuffed in a plastic bag. So far, I've copied the PCB layouts in CAD, and drawn up freehand schematics of the LED power indicator and amplifier boards. It'd be nice to see a real schematic, or get some voltages off a working unit, if there's any out there. This amp inspired me to start the Vintage audio wiki entry on CM Labs, mostly with information from Usenet posts, other forums, and old audio magazines: http://www.diyaudio.com/wiki/index.php?page=CM+Labs I'm also working on a personal web page where I'll post the CM920 "reverse engineering" info, and anything else relating to CM Labs products and the company. There won't be much to start with: a couple of photos borrowed from auctions, the 911T schematic, the CC-2 preamp review from High Fidelity.

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12th April 2007, 06:47 AM	#2
Ed Coleman diyAudio Member Join Date: Jul 2006	C/M/Labs? I have a very well cooked 35D that I would love to get rebuilt, one of the circuit boards is absolutely scorched! Would you happen to have a schematic for it? I'm also getting a 911 at the end of the week, can't wait to get it cleaned up and power it up ! I did read the nice article your post was linked to , what surprised me is that it didn't mention the tube amps CM built. I have an email from a gentleman that claimed he had one of their tube amps back in 65-67 time frame. I'll dig it out and forward it if you like. Please let me know how you're doing on your rebuild , sounds like quite the project ! Ed

17th April 2007, 06:21 AM	#3
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	I can report no progress on the CM 920 amp. The only schematics I've got are the 920 (sort of) and the 911T. It could be worth contacting Scott Dorsey http://www.kludgeaudio.com/ since he used to work for CM Labs in a technical capacity and see if he can help. If one channel of the 35D is still good, then it should be possible to reverse engineer it and fix the other channel. I haven't seen any other evidence of tube models, so please forward that email.

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