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Old 14th October 2006, 07:37 PM   #1
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Default Crown Micro-Tech 600

Hello All!

With being out of school this year, i am bored and looking for new projects to work on. I found this ancient amplifier in the closet, and its condition is well....ancient/(channel two on this thing doesn't really exist.) Gangster i know. But the aim of this project is:

Make this Amp better than it was originally designed too....or

Make it sound like the day it came out of the shop.

I will post pics of the conditions later. I just want to hear some feedback. One major thing is the loud fuzz when gain knob is turned. But yes, pic's comeing soon.
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Old 14th October 2006, 07:47 PM   #2
v-bro is offline v-bro  Netherlands
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Dust out, new pot in, clean switches and maybe replace a few caps (though crown often uses "mallory" caps, they last and last.....) and your good to go I guess.
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Old 15th October 2006, 04:59 AM   #3
Leolabs is offline Leolabs  Malaysia
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resolder all solder joints.............
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Old 15th October 2006, 09:37 AM   #4
ds23man is offline ds23man  Netherlands
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Do not bother, they did not sound anyway when they where new. No definition, lacking in the high freq. and the low end is not tight. In the past I did a-b comparison tests with microtechs and the Carver PM1.5 in PA systems, the only conclusion was to throw the Crowns in the wastebin. I owned also a set Crown Delta Omega's, they where great.

GRG
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Old 15th October 2006, 10:51 AM   #5
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Not much better than the clown DC300 amplifier. The design wasn't great by any means. The parts were run at the edge of their design limits. Makes a better boat anchor or paperweight than an amplifier.
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Old 15th October 2006, 05:44 PM   #6
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Well no doubt, i realize that this amp is a piece. Do you think i could use the amp's chassis to create a really awesome(but also really cheap) amp? If so, where should i start cause i would have no idea....
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Old 15th October 2006, 05:58 PM   #7
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FYI References: http://www.crownaudio.com/gen_htm/legacy/legacamp.htm ... middle of page.

Anyway, here's what I did with mine: http://3dotaudio.com/ampics.html

Your transformer is a whole lot bigger ... so maybe you could do better.
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Old 15th October 2006, 06:19 PM   #8
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Quote:
Originally posted by FastEddy
FYI References: http://www.crownaudio.com/gen_htm/legacy/legacamp.htm ... middle of page.

Anyway, here's what I did with mine: http://3dotaudio.com/ampics.html

Your transformer is a whole lot bigger ... so maybe you could do better.
40 Farads X 2 PS filtering

Sounds cool, you can run it without UPS.

Also, if you got 64VDC from 50VAC, it means your DC is regulated.
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Old 15th October 2006, 06:32 PM   #9
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"40 Farads X 2 PS filtering " ... = two PS filter boards with four 10000 uF caps on each.

"Sounds cool, you can run it without UPS." ... Uninteruptable PS ?? ... don't need 'em = got Gysers power plants up the hill ...

"Also, if you got 64VDC from 50VAC, it means your DC is regulated." ... I may have mis-spoke ... the torrid transformer output is ~+/- 45 VAC (not 50), so the output (by actual measurement) is +/- 64.1 VDC ... which slightly overdrives the AussieAmplifiers NX-150 modules by about 1/2% ...

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Old 15th October 2006, 06:57 PM   #10
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So, you have 1000 times less than 40 Farad, and 45-0-45V transformer (45*1.4142=63.639; 63.6-0.7=~63V)
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