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Old 1st May 2008, 02:47 PM   #1
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Default Circuit Diagram / Schematic & Full Manual 4 Crown Ic-150 Pre Amp Wanted

Hi guy's.

A short while ago I landed myself a Crown IC150 preamp to go with my DC300a.
The sound produced by this combination is superb & much better than I ever expected ! The bass in particular is very impressive , my Tannoy DMT-12 II's luv it !!

Thing is , as the IC 150 was made some time b4 CD players were thought of , it doesn't really have an ideally suited input for this medium. Therefore I would like to modify the AUX input accordingly. Hence my request for a circuit diagram.

A manual would also be very useful.

Would prefer originals and am happy 2 pay a fair price.

Thanx
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Old 1st May 2008, 03:03 PM   #2
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Crown has many of their legacy manuals available from their website.

You might want to change the IC's to the LM4562 -- these are available in TO-99 -- LM4562HA -- you can put the other ones back in if you don't like the difference.

I pooged my IC-150 with the LM4562's, new gold RCA's, and Super Regulators, mU metal shielding of the power supply and it sounded magnificent. The RIAA still leaves a bit to be desired.

http://www.tech-diy.com/Preamplifiers/CrownPooge.htm
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Old 1st May 2008, 03:22 PM   #3
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Thanks for that info. I was wondering about the ic's !
The RCA's were on the upgrade list as the originals r nicely oxidised.
Hadn't thought about PSU screening though. Where would I obtain Mu metal ?
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Old 1st May 2008, 04:15 PM   #4
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Quote:
Originally posted by thermal runaway
Thanks for that info. I was wondering about the ic's !
The RCA's were on the upgrade list as the originals r nicely oxidised.
Hadn't thought about PSU screening though. Where would I obtain Mu metal ?
it's far from a necessity to shield the power supply !!!

you can get mU materials from the company -- but the sample kit is pretty expensive -- http://www.mushield.com/ -- it's a little difficult to work with in that if you bend or kink the material it loses a lot of its shielding prowess. the transformer in the IC-150 is shielded to begin with and I had some laying around from fixing up a Tek SG505.

MuShield suggests that if you are DIY'ing try shielding with a piece of aluminum foil before laying out $180 for the shielding kit.
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