Help: 6550 / KT 88 powertubes

[Psycho Bass Guy]

I don't speak Dutch, but I was able to glean out some info. It is a very thorough report and I take back what I said about finding a real tech.

Is this your model amp?

http://users.telenet.be/orangefg/OFG_AD200BH.htm

If so, I can't really see a point in the layout picture that could lead to a bias failure on just one side of the amp, but the picture has too little detail. Without a schematic, even enlarging the pic to the point of blurriness doesn't help.

 If it wouldn't be too much trouble, could you translate the whole report?

[Psycho Bass Guy]

Here is some more info on your amp I've been able to dig up:

http://www.tube-town.de/ttforum/index.php?action=printpage;topic=11489.0

http://www.dustblow.com/ad200b/

http://www.mercurymagnetics.com/pages/news/PremierGuitar/PremierG-22.htm

http://www.planetoftheamps.com/orange-ad-200-mk3-bassamp.html

[Basvarken]

I don't speak Dutch, but I was able to glean out some info. It is a very thorough report and I take back what I said about finding a real tech.

Is this your model amp?

http://users.telenet.be/orangefg/OFG_AD200BH.htm

If so, I can't really see a point in the layout picture that could lead to a bias failure on just one side of the amp, but the picture has too little detail. Without a schematic, even enlarging the pic to the point of blurriness doesn't help.

 If it wouldn't be too much trouble, could you translate the whole report?

Yes that's my model amp.
I will try to translate the whole report.

And I'll check the links from the other post.

Thank you  for your help

[Psycho Bass Guy]

The German link is supposed to have a schematic with it and his problem is similar to yours. I could never see a schematic in either the translated or the native language format, anh I'm hoping that you may be able to. My computer doesn't always dispaly web pages properly as I've got my security pretty tight.

[sniper]

this guy owns a repair shop in chicago and plays an AD200B amp as a bassist. he might be able to provide you with a schematic if he made one when he rebuilt his amp:

info@schroederguitarrepair.com

an article about his rebuild:

http://www.mercurymagnetics.com/pages/news/PremierGuitar/PremierG-22.htm

only trying to help here

[Basvarken]

Much appreciated