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Messages - helste

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1
Here are the pictures after the replacement of the caps.

2
Hello Buddy,

I need your help. I replaced all the big capacitors on the side where the tubes are and the brown coated capacitors you see in the pictures. In summary I replaced 2x 350V 70uF, 3x 550V20uF, 1x 100V 80uF and 7x 25V 25uF.
I used quality audio capacitors made in Germany.

Unfortunately there is still the ugly noise when I switch the standby switch on.

I made a short youtube video, where you can hear it.

https://youtu.be/rY47sdQAZk4

Do you have any ideas, what I should look next?
Any meassurements to be taken or anything else to be replaced?
Any help would be highly appreciated.

Best 73 de Helmut

3
Just found a German shop where I can get those caps.
I think the 20uF and 70uF from my last picture should be there.
http://www.tubeampdoctor.com/de/shop_Kondensatoren_TAD_Audio_Caps/

4
Hi, I am just working me through the capacitors specs. As there are so many different capacitors on the market with the same specs, but different kind, it is hard to decide which one to use.
I found an article about it
http://www.humblehomemadehifi.com/Cap.html

But that is quite a long article and before reading the whole thing, I wanted to ask, if you could give me some input, what capacitors to use.
For example, when I want to replace those on the attached picture, which new caps should I look for?

I can read the specs, but there are so many different lokking and probably working caps out there, that it is hard to judge which one to use.

I also found a place to buy which is here: http://www.justradios.com/cart.html

My preference would be a source here in Austria or somewhere else in Europe, but if not possible, I would also order from somewhere around the world.
As shipping fee is an issue then, I would prefere to order the whole things in one order.

So if you could point me to a shop or just tell me what I should search for, that would be highly appreciated.

If I could get all the stuff I needed, replacing would be an easy task for me, as I know how to solder, have the tools to solder and also have the tools to measure.


So in a first step, I would replace every single cap as soon as I have the replacement parts handy.

5
Thanks for your answer.
It allready has a 3 wire power cord. So it should be safe.

On the label in the chasiss it states that it is production #1. So must be one of the first amps produced from this modell.
I made some pictures and put it into the attachments.


6
So glad I found your video on youtube. Will watch it again and also the other videos on that topic.

I have an old Pro Reverb AA165 from my father in law and that makes a horrible sound when turned on. It was not in use for ages and I think I have to replace all the capacitors. Just have to get all of them.
It must be an older version of the amp from somewhere between 1965 and 1967. Serial number is A00252.
As I am not an expert on that topic, I hope to find some help in here.

Best regards from Austria


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