Crown Micro-Tech 600

dirtyk777 · 14th October 2006, 07:37 PM

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.

v-bro · 14th October 2006, 07:47 PM

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.

Leolabs · 15th October 2006, 04:59 AM

resolder all solder joints.............

ds23man · 15th October 2006, 09:37 AM

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

Original Burnedfingers · 15th October 2006, 10:51 AM

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.

dirtyk777 · 15th October 2006, 05:44 PM

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....

FastEddy · 15th October 2006, 05:58 PM

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.

Wavebourn · 15th October 2006, 06:19 PM

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.

FastEddy · 15th October 2006, 06:32 PM

"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% ...

Wavebourn · 15th October 2006, 06:57 PM

So, you have 1000 times less than 40 Farad, and 45-0-45V transformer (45*1.4142=63.639; 63.6-0.7=~63V)

14th October 2006, 07:37 PM	#1
dirtyk777 diyAudio Member Join Date: Oct 2006	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.

14th October 2006, 07:47 PM	#2
v-bro diyAudio Member Join Date: May 2006	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. __________________ Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......

15th October 2006, 06:57 PM	#10
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	So, you have 1000 times less than 40 Farad, and 45-0-45V transformer (45*1.4142=63.639; 63.6-0.7=~63V) __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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15th October 2006, 04:59 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	resolder all solder joints.............

15th October 2006, 09:37 AM	#4
ds23man diyAudio Member Join Date: Oct 2006	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

15th October 2006, 10:51 AM	#5
Original Burnedfingers diyAudio Member Join Date: Nov 2002	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.

15th October 2006, 05:44 PM	#6
dirtyk777 diyAudio Member Join Date: Oct 2006	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....

15th October 2006, 05:58 PM	#7
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	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.

15th October 2006, 06:32 PM	#9
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	"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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