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Old 7th January 2004, 11:08 PM   #11
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Quote:
Originally posted by Andypairo
I checked again and... there are no power resistors !

It's probably the first design I see that doesn't use 'em...

Cheers

Andrea
Hi andrea!

The legendary NAD 3020 doesn't also use emiter resistors...

Ci vediamo!
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Old 8th January 2004, 05:40 AM   #12
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What is the name of the output devices???
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Old 9th January 2004, 05:21 PM   #13
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Probably tomorrow I'll unscrew the pcb from the heatsink and will be able to read their name.
They are T03-p devices, and are mounted under the PCB

Cheers

Andrea
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Old 14th January 2004, 01:48 PM   #14
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Angry Bad news, what has gone wrong?

I removed all the solderings on the pin-strip connectors and made a matching PCB with local bypass capacitors (1000uF) on the supply rails.
This cured the nasty oscillation that occurred before.

I also removed the input capacitor coupling, connecting the "POS" pad to the RCA input and the "NEG" to GND.

Attaching my signal generator and a dummy load everything worked fine, so I took it to my friend's house.

First we connected it after his preamp and everything worked fine, he liked it and said it sounded much more similar to his EC-2 integrated amp.

Afte that he wanted to test it with direct connection to his Marantz CD14, which has a variable output.

On switching on there was a buzz on a speaker with a woofer bumping-out (symptom of DC on the output), we switched the amp off and then on again and could listen to some music.

The next time we switched it on the DC on outpuw was still present, so I looked at the inside and found a loose soldering on one supply (driver).
I re-soldered the joint but this didn't cure the problem, so I took the amp home again.
Here, to my surprise, it works flawlessly.

I suspect the CD player output, but how can be possible that a 2500 player has DC on the output?

Any suggestions??

Cheers

Andrea
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Old 14th January 2004, 02:42 PM   #15
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Exclamation Reply

Most marantz cd players are direct coupled at output , they donot use coupling caps on their outputs
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Old 14th January 2004, 02:55 PM   #16
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I suspected that, but didn't think that this could cause any harm... after all the amp has a DC servo on board! (or maybe is the servo faulty?)....

Cheers

Andrea
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Old 14th January 2004, 03:07 PM   #17
stigla is offline stigla  Norway
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Have you tried the Electrocompaniet Forum?

http://www.electrocompaniet.com/disc/default.asp

I have no experience with this forum, but maybe someone can help you out.

I have never heard of a AW65 though, Just AW60 (whitch is a descendant from the AW120 monoblocks...)


stigla
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Old 14th January 2004, 05:03 PM   #18
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Default Some pics, just to identify it...

I took some pics that might help identifying the amp...

The main board with the auxiliary PCB I used to avoid soldering on the connectors and to place some bypass caps
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Old 14th January 2004, 05:05 PM   #19
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The protection board (that only acts as delay since the connector is not attached...)
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Old 14th January 2004, 05:08 PM   #20
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The front panel.. the red writing says "Ampliwire 65 2 Channel High permformance Audio Amplifier"
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