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-   -   Pics of my Cresendo Amp (http://www.diyaudio.com/forums/solid-state/26122-pics-my-cresendo-amp.html)

valo 15th January 2004 04:30 PM

Pics of my Cresendo Amp
 
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Hi

valo 15th January 2004 08:20 PM

inside
 
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Some testing

Bensen 16th January 2004 11:20 AM

Hi Valo,

Nice amp you've made there. If I'm not mistaking, it is the original Crescendo from 1982.
I've build it myself to. My first prototype used fans also, but they where making to much noise on low level output. So I bought bigger heatsinks. I'm wondering if your heatsinks are big enough. My heatsinks (150x200x40mm, 0,4K/W) are heating up to about 65°C with a roomtemperature of 25°C.

How much VA is your powersupply, 4x300VA I guess? Did you use trannies with a secondary voltage of 50VAC? I've had to use two 55VAC secondary's to get a total of 148VDC

And out of what material is your frontpanel made? It looks cool.

What have you used for source resistors? Don't use wirewound resistors, the amp wil be oscillating than. I used 4 x 1ohm/1W in parallel.

It runs perfectly for about 3 years. Sound is good.

Pics of my amp, see:

http://groups.msn.com/BenJanssen/6ka...nw?albumlist=2

Cheers
Ben

valo 16th January 2004 02:13 PM

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Hi Bensen

My heatsinks are ok, the temperature are aobut 60C, and the fan is not in use..

The›powersupply is 4x400VA, It is a overkill and i have problems starting up the amp, My spftsrater is to slow..

I also used 4x1ohm/1w for source resistors.

Frontpanel was med of plexiglass, and I painted it black on one side, gives me the electrocompaniet look :)

Sorry for My bad English :)

joensd 16th January 2004 02:43 PM

Hi,
as I built a crescendo amp (ME) as well I´m just curious how much bias current you setup for your amp.
Do you think the recommended 200mA (for the ME) is the "sweet spot".
Very nice amp by the way, valo.
Looks like a rocksteady thing.

Cheers

Bensen 16th January 2004 03:09 PM

Hi joensd,

I've build the crescendo ME also. I use it in a bridge configuration to power my sub.
The bias current is at the moment 200mA. It runs perfectly.

I doubled the output devices to drive the peerless xls12 (8Ohm).

Ciao

Ben

Vivek 16th January 2004 05:04 PM

Nice work.

valo 18th January 2004 04:11 PM

Thanx Vivek, an it sounds good to :)

danne_linkinpar 21st February 2006 02:13 PM

Is it the Crescen do 250W Mosfet ??

valo 21st February 2006 07:06 PM

Quote:

Originally posted by danne_linkinpar
Is it the Crescen do 250W Mosfet ??

140 W I think.. I realy dont remember :)


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