PPI A600.2

[Jason Smith 616]

Anyone have a high res pic of the output section?

I need a pic of the area around the resistor network and SG3525

 

[ppia600]

Trying to upload a few, may not be clear enough but hopefully they help.

 

[Jason Smith 616]

Thanks for the pics .

I think i have a different revision of the amp.

My board is marked 75-2150-0001

The lay out is totally different then yours

 

[ppia600]

I have the previous one as well, have to pull the cover...


Well crap, the bit that fits must be at work. Already had the a600.2V2 opened for recapping (taking forever) but hadn't planned on recapping the a600.2V1 until I was confident it was doable.

Let me grab some allens and bits from work tomorrow to bring home and snap some pics.

 

[ppia600]

A600.2 V1 pics

A600.2 V1

 

[Jason Smith 616]

Thanks greatly appreciated !!!

 

[Jason Smith 616]

2 more questions on this amp.

Do you happen to know what transistors are being used In Q31,32,33,34 locations ?

And also the rectifiers are BYW29F do you know of any good replacements ?

 

[Jason Smith 616]

Anyone know what transistors are being used in the following locations?

Q24,31,32,33,34

 

[Jason Smith 616]

Ok i think i have most of this amp figured out.

Only thing i cant figure out is the regulators.

Im assuming they are using 2N6488 and 6491 for the regulators.

They are using a transistor connected to a diode then to the regulator 1 transistor is a MPSA56 would the other transistor be a MPSA06? Q24 does anyone know?

 

[Perry Babin]

This is from a different model but very similar. The regulators have a current limiter in series with them.

 

[ppia600]

Perry, I tried sending you a message but maybe I'm blocked. I wanted to see about getting some reconditioning and tuning done on a few amps if it's doable. I'd rather not risk damaging the traces and don't want to risk adjusting bias and not having them just right.

 

[ppia600]

The Q24 on the amp I posted second pics from is a n 06 with a gray face. It's close to C15.

Ok i think i have most of this amp figured out.

Only thing i cant figure out is the regulators.

Im assuming they are using 2N6488 and 6491 for the regulators.

They are using a transistor connected to a diode then to the regulator 1 transistor is a MPSA56 would the other transistor be a MPSA06? Q24 does anyone know?

 

[Perry Babin]

ppia600:
I don't take in any work that has to be shipped to me.

With the old amps, you have to make clamps to hold the semis down tightly to adjust the bias.

You can always contact me via email. A link to my email is on virtually every page of all of my websites.

 

[ppia600]

ppia600:
I don't take in any work that has to be shipped to me.

With the old amps, you have to make clamps to hold the semis down tightly to adjust the bias.

You can always contact me via email. A link to my email is on virtually every page of all of my websites.

That's ok, didn't realize you couldn't do that. I can't remember the address you gave me when I sent the amp to get the transformer replaced, was it near Metairie? Either way, I don't make trips that way often. There are tons of places claiming to service them, I will try and find a professional shop with a good reputation.

 

[Jason Smith 616]

Anyone have a high res -pic of the ceramic driver card?

I noticed the cards in this amp do not have the correct part numbers on the board.

I have to rebuild the driver cards carefully

 

[Perry Babin]

At this time, the driver board are only rarely repairable due to the pads and traces.

Has someone repaired it and used parts that are not compatible? The manufacturer of the driver boards used parts from at least 2 different semi manufacturers so the markings will not match on all of them.

 

[Jason Smith 616]

As you can see there are 2 different boards with different part numbers and 1 transistor is blown on the board .

Also you can see someone replaced parts on 1 board

Wondering if these 2 different boards will work if i replace the transistor that's blown

 

[Perry Babin]

The boards are interchangeable as far as I know.

Replace/solder only what's absolutely necessary.

 

[Jason Smith 616]

Which ones are the bias pots ?

The ones in front of the drivercards VR1,VR3

or are the behind the power and protection leds VR4,VR5 ?

 

[Jason Smith 616]

Does anyone have a high res pic of these 2 transistors showing the part number or could tell me what the part numbers are?

As soon as i apply power and ground no remote the amp powers up and burns resistors