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Old 8th February 2006, 04:07 PM   #1
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Default Crimson amp service info

Hi,

I'm trying to fix one of a pair of Crimson 630 monoblocks. The output stage has been shorted and despite attempts to repair it the circuit refuses to stop oscillating.

Does anyone have any service info/schematics?

If not can anyone offer advice/experience?

Thanks in advance,
Tom.
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Old 8th February 2006, 06:27 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
send me your email address.
I have the schematic for the VII and photos of the std and imp boards.

Let me know which PCBs are fitted inside the 630.

I dare not post it since Crimson is still running.
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Old 8th February 2006, 11:02 PM   #3
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Great, thanks! Will get back to you with email once I know which board it uses.

Are Crimson definitely still in business? I have tried calling Virtual Reality (distributors) but I can't get anything out of them...

Thanks again for your help. Will be back in touch tomorrow.
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Old 9th February 2006, 01:10 AM   #4
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I still have a pair of 25 year old Crimson 100W/4R amps working well.
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Old 9th February 2006, 08:25 AM   #5
AndrewT is offline AndrewT  Scotland
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Were they still Crimson Elektrik at that time?

My first kit (1100) from the 70s was, but all my later 1704s were plain Crimson.

Can anyone enlighten us on the history including Quantum?
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Old 9th February 2006, 08:36 AM   #6
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They were Crimson Electrik in the Feb 1979 Wireless World

UKP19.22 for a CE 1004 100W module, UKP32.40 for a stereo 60W kit.
Not bad when the Lisnsley Hood 75W was 99.30
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Old 9th February 2006, 01:36 PM   #7
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OK.

So I've had another look. It's a 630d, fairly recent. No markings on the board though, just "A Brian Powell design".

On the back of the board is written (by hand) "0200".

Anything would be helpful. The amp is oscillating at RF. Any thoughts/experience?

Fantastic sounding amps. I really kicked myself when I shorted it. Crimson catalogue says something like "Output short protection circuit...virtually bombproof". Hmmm.

Cheers!
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Old 9th February 2006, 01:47 PM   #8
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To have survived so long mine must be bomb proof.
Is your model still a quasi-complementary?
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Old 9th February 2006, 01:57 PM   #9
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A picture of the man and some history here:
http://www.aufi.co.il/amp/crimson.pdf

It appears to be complementary bipolar. Are you sure your replacement transistors are genuine parts?
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Old 9th February 2006, 02:06 PM   #10
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The transistors used in attempted repair are off the shelf parts. But substituting transistors from the working monoblock doesn't cure the fault. When I first blew it up the output was completely dead. Output transistors completely toast. A couple of burned out resistors have also been replaced. Now it's working (ish), but after a couple of minutes (if that) it goes unstable.

The fault originally occurred when one of the speaker outputs was shorted against a signal earth on the preamp. The pre is fine.

Schematics to: tom.goldsmith@talk21.com

I'm not actually doing the repair myself, an engineer friend of mine is, but he's well and truly stuck... So if I sound like I don't know what I'm talking about... I'm passing the info on.
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