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Old 13th March 2012, 06:12 AM   #31
kx2 is offline kx2  United Kingdom
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Join Date: Oct 2007
Default Crimson amp rebuild

Decided to do some checks last night. Swoped the speakers leads round and realised that there was nothing wrong with the amp and that the right speaker was the problem. Checked the resistance and one of the speakers was reading 1.5 ohm's. It looks as if one of the speakers units has gone. They have a 5 year gaurantee so hopefully it will be replaced.
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Old 13th March 2012, 10:30 AM   #32
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Oh thats good news [of sorts],i see that there is another Crimson thread going!.
Good luck.
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Old 14th March 2012, 12:38 PM   #33
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Join Date: Feb 2012
Many Many years ago I built the pre power kit from Crimson using 1004 modules. IIRC the whole thing cost about 175.

It was rather god, and I wish I had kept it now instead of giving it away (I know, I know) But in those 'pre web' days there were very limited options.
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Old 14th March 2012, 12:48 PM   #34
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
I have used the 1704 series vii modules. I really liked them.
I have sold four of them and retained two. I also have two series viii.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 14th March 2012, 01:42 PM   #35
kx2 is offline kx2  United Kingdom
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I have both the preamp and the moving coil board sitting in the loft unused.
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Old 29th March 2013, 11:32 AM   #36
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Hi bepowel, are you still doing repairs/upgrades to CPR1's. If so I have one that is down on 1 channel that I would like to get fixed...Regards ..Andy, Essex, UK
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Old 20th August 2013, 07:49 PM   #37
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Default Crimson Repairs


Sorry about the late reply!

I still do repairs/updates on Crimson. Email me on and I'll provide further details.

Brian Powell
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Old 20th November 2013, 01:16 PM   #38
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Interesting amplifier

kind regards,

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Old 26th March 2014, 09:54 AM   #39
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Location: Florida & France
I'd be interested in how the latching protection works on some of those amps.

Any schematics? Detailed operation?
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Old 26th March 2014, 01:54 PM   #40
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When the V-I limit operates continuously, the VAS sources excess current via an NPN emitter follower. The current in this transistor is sensed and switches on an NPN/PNP pair using positive feedback which imitates a thyristor. The switches on a current which collapses the voltage reference for the both VAS current sources. No current in the VAS means a "dead" output which remains latched that way until the power supply is switched off and a capacitor on the PCB discharges. As far as I know Crimson were the first to disable a solid state power amplifier without the use of fuses or circuit breakers. See
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