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Old 8th January 2005, 10:07 PM   #1
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Default Crimson Elektrik power amps

I've got a pair of these monoblocs I built about 15 years ago that I just powered up. Sound is still surprisingly good so I want a tweak see if I can improve it. Anyone got a schematic or a circuit diagram, mine have long gone

Kev
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Old 8th January 2005, 10:27 PM   #2
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Well, i knew I had something on Crimson Amps buried in the depths of my hard drive, but it turns out to be a pdf of their brochure of prebuilt products from about 10-15 years ago. But if you want it, I'll mail it to you.
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Old 8th January 2005, 11:23 PM   #3
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Quote:
Well, i knew I had something on Crimson Amps buried in the depths of my hard drive, but it turns out to be a pdf of their brochure of prebuilt products from about 10-15 years ago. But if you want it, I'll mail it to you.

Thanks Pinkmouse it will probably be interesting

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Old 8th January 2005, 11:33 PM   #4
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On the way.
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Old 9th January 2005, 09:22 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
I have the schematic for VII and VIII (the 2002 version).
For tweaking the series VII just update it to series VIII, but you will need to saw off the end of the pcb that is currently under the heatsink angle and hardwire the new output transistors into the old board. You also need to review the RC time constants around the feedback loop and input hipass. The circuit responds well to plastic decoupling caps everywhere and a beefy PSU. I use +-20,000uF per rail (total 80,000) and 625VA transformer.
The old 2n3773 had excellent SOA upto 100v most new transistors cannot match them so you may want to consider doubling up the outputs. Series 8 pcb is already drilled for 4 outputs with emitter and collector resistor positions.
Finally, output of VIII is fully complementary using darlington shiklai (CFP) after the predrivers.
Email me, I might be able to digitise the schematics (photo) or else post them.
regards Andrew T.
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Old 19th January 2005, 06:54 PM   #6
AndrewT is offline AndrewT  Scotland
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Hi Kevin
I seem to be having trouble getting through on your Email.
Previous message came back undelivered over 4 days & Wednesday's message is unanswered.
Can you confirm a reliable way to Email my info?
regards Andrew T.
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Old 8th November 2007, 08:38 PM   #7
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Hi Andy, Any chance you could send a copy of the crimson info to me as well. I'd be interested to have a look see. I still use my CK1100 still going strong despite the use it gets. I guess I must have bought my kit about the same time you did. I used to work near to the Crimson workshops. They were a friendly lot, always had time to talk...
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Old 11th November 2007, 10:35 AM   #8
AndrewT is offline AndrewT  Scotland
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Originally posted by Simon Ward
..... I still use my CK1100 still going strong despite the use it gets. I guess I must have bought my kit about the same time you did. ..........
Hi,
the CK1100 was the first Crimson I bought. I got an A5 turquoise booklet with it. Didn't you?
It and the later schematics had bad advice on grounding and I always had a little residual hum & buzz with it. It wasn't until about 20years later that I discovered where they went wrong.

All my later versions came with photocopied assemply and schematic. Except series Viii which I had to reverse engineer, to see the similarities over twenty five years of development.

Email me with your requirement.
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Old 11th November 2007, 04:33 PM   #9
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Thanks Andrew I cant mail you because I'm still under moderation.. I didnt get a nice booklet I got 5 sheets of A4 with step by step assembly instructions and a drawing showing the wiring runs. I've never had a problem with the thing from the day I built it up until last summer. One of the input transistors got a little noisy. Never had problems with mains hum / noise as a stand alone Amp. But had on rare occaisions had to disconnect Earths..
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Old 11th November 2007, 04:33 PM   #10
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My problem at the moment is that I worry how long this thing will live for before it gives up. I have replaced the 4700uf Capacitors with low ESR Sikorel's. Also put filter next to each pcb supply connection. That made a simply massive difference to the mid range clarity and stiffend up the bottom end a little. I tried driving the amp with a good op amp line amp and a EAR valve line amp (the later giving nice warm midrange). but not being altogether happy I built the air guitarest (naim clone but nicer parts and better earthing). They really go well together very musical etc... My problem is what do I build to replace it without breaking the bank ?
I thought it would be nice to get hold of a copy of the circuit. I could always try building a new one and try tweaking it. My boards do have the 2N3773 output transistors. Certainly stood up well over the years. Even survived the heatsink thermal trip on occaisions.
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