Circuit Diagram / Schematic & Full Manual 4 Crown Ic-150 Pre Amp Wanted - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st May 2008, 02:47 PM   #1
diyAudio Member
 
thermal runaway's Avatar
 
Join Date: Mar 2007
Location: West Mids , UK
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
  Reply With Quote
Old 1st May 2008, 03:03 PM   #2
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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
  Reply With Quote
Old 1st May 2008, 03:22 PM   #3
diyAudio Member
 
thermal runaway's Avatar
 
Join Date: Mar 2007
Location: West Mids , UK
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 ?
  Reply With Quote
Old 1st May 2008, 04:15 PM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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.
  Reply With Quote
Old 1st September 2014, 04:11 AM   #5
diyAudio Member
 
Join Date: Oct 2009
"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."

This was a long time ago but interested in how an LM4562 DUAL op amp went into a SINGLE op amp socket. Pins are all off unless you destroy the integrity of the unit. As would changing to gold RCA's. Surely new nickel plated would have been cheaper and done the job? Crown deserves a better history.
  Reply With Quote
Old 1st September 2014, 04:47 AM   #6
diyAudio Member
 
Join Date: May 2005
Location: toronto
Don't know which version of IC 150 you have, the earliest used UA 739 op amp and both phono and line amps are awful designs. The chassis is worth a full mechanical and electrical rebuild - nice home for a Pass DIY with new jacks and volume controls , but don't waste your time on the original circuit. Later ones were better and could host op-amp upgrades.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Circuit diagram, service manual or help for NAD C350? benjoh Solid State 9 28th June 2013 09:49 AM
Wanted: Crown K2 service manual or schematics len_scanlan Solid State 52 13th July 2008 08:15 PM


New To Site? Need Help?

All times are GMT. The time now is 04:31 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2