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Old 14th January 2004, 05:09 PM   #21
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The "original" caps.. rated 40V and running at 45!
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Old 14th January 2004, 05:12 PM   #22
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Last pic.. the rectifier/supply boards with the new capacitors installed... some components are missing and on the back there is a unused connector matching the one (also unused) on the protection board...
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Old 14th January 2004, 08:43 PM   #23
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Default Re: Bad news, what has gone wrong?

Quote:
Originally posted by Andypairo
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

Hi Andrea!

The CD must have a DC blocking capacitor...at turn on this capacitor need to charge ( at this moment you have the off set in your Electrocompaniet)...after that it work fine because the capacitor is charged and ther is no DC output from the CD...

Simple!
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Old 16th January 2004, 07:38 AM   #24
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I don't understand, the CD player was already on, the only thing that I switched was the amp.

Cheers

Andrea

PS The amp is running at nearly full power from 2 days.... no problems so far
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Old 16th January 2004, 10:14 PM   #25
Lyra is offline Lyra  Norway
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Quote:
Originally posted by stigla
I have never heard of a AW65 though, Just AW60 (whitch is a descendant from the AW120 monoblocks...)
stigla
AW60FTT is a relatively new amp, and the AW65 is rather old.....+10-15 years I think.
Had one some years ago, but sold it and bought a new AW60FTT....

Think I have the schematics for this..or definitly the AW100.....somewhere....can take a look/scan it if you still need it....

Quote:
Originally posted by Andypairo
The "original" caps.. rated 40V and running at 45!
....and.....this is definitely wrong!!!!!. It should NOT be as high as this! I am not sure of the voltages on the AW65, but the AW100 operates with two voltages: +- 42V on the output-amplifier-stage, and a regulated +-52V for the voltage-amplifier-stage.
It's either wrong trafo, or just maybe....mounted for 110V, and running at 220V....don't know if this is possible thow...
Even with CAP's that could stand this voltage, the output-BJT's will definitely blow up if you push it...that is if there are only one pair of 2SC2681/2SA1141 on each channel.........but thats just me and my opinion....

Are you sure it's not dual voltages on this amp too...that would make sense.....+-35V for the output, and +-45V on the voltage amplifier-stage....typical ELECTROCOMPANIET you know....

PS: I've buildt one AW100 clone some 10-12 years ago, and it is still going strong...some groung hum but really powerful!...


BTW: bee careful and don't "loose" GND on the inputsignal.......it will most certanly kill your output. I used to connect GND on both right and left toghether inside of the amp, just to provent a "dicaster" if one of the RCA-jack's should get loose/ defective etc.
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Old 16th January 2004, 11:37 PM   #26
Lyra is offline Lyra  Norway
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Hmmmm.....strange!!!!
I have just gone trough my papercopies of the schematics, and this amplifier-board dosn't belong in this amplifier!!!?
The board look alot like the "newer" AW-75 board, but it hasn't the right markings....
It's definitly not the original AW65 board....that I am quite sure of. It have totally wrong layout!!!
Just maybe it is two boards originally meant for a AW120, but I don't have the scematics for this....just the AW75, but I think they are pretty similar. Aprox same age...

Seems like there are/ should be extra output-BJT's located on the "originally equipped AW-75/AW-120" SERVO-board. (2SC2565/2SA1095)
As the AW-75 uses a total of 4 BJT's on each channel, the AW-120 would probably have 8 BJT's (my guess!...)
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Old 16th January 2004, 11:45 PM   #27
Lyra is offline Lyra  Norway
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BTW....if you decied to use the cabinet and supply for another DIY amplifier, give me a hint (mail ), and I might be interested in buying the AW-120 boards....

..and if not, I have some scematics that could be handy!?

PS! If this amp is in a good/ right condition it will play music just exellent!!!! Beautiful sound, especially the vocals and higher frequencies......!


All the best!
LYRA
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Old 17th January 2004, 11:52 AM   #28
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Hello Lyra,
as stated in the first posts the guy who modified it (but it rather seems that he built it from scratch, even if with original Electrocompaniet boards....) claimed that the boards were identical to a higher power amp, my friend remembers "AW100" but it can be the 120 as well...

The outputs work at about +/- 45V (so I had to change the reservoir caps with 80V types), the preamp section runs at about 62V, and definitely there is just one pair of output devices.
I also think that they should be at least doubled.

Note that the guy is an official Electrocompaniet repairer

Anyway if you have a schematic I'd gladly receive it, my email address is andrea.pirovano@libero.it

It came to my mind to remove everything but the supply and to put a Lynx amp inside it (I'm sure ACD would appreciate ) but I don't think my friend would like it... anyway I can ask him if he is willing to sell the boards (you can send me a eventual offer along with the schematics if you want )

Cheers

Andrea
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Old 17th January 2004, 12:08 PM   #29
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Here a closeup of the board showing that there are only 2 outputs and no power resistors.
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Old 17th January 2004, 02:52 PM   #30
Lyra is offline Lyra  Norway
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Scanning the scematics now....but the scanner is old and slow.
Was thinking...You could use the boards as is, but you should change the trafo to a smaller one...like the one in AW-60FTT. This amp has only one pair of output-devices.


....better safe than sorry.......
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