ELEKIT TU-8850 SE KT170 SET AMP

[dcgibby]

So the TU-8550 started putting out a serious smell today. Something is getting very hot. It sounds fine, but I pulled it out of the system and will tear it apart later. I've been running it pretty hard since I finished it last month, but I'm surprised something is failing so soon. We'll see.

 

[vkung]

You need to check all test points to make sure it is with in range..

 

[CohibaJoe]

So the TU-8550 started putting out a serious smell today. Something is getting very hot. It sounds fine, but I pulled it out of the system and will tear it apart later. I've been running it pretty hard since I finished it last month, but I'm surprised something is failing so soon. We'll see.

Can you take some pictures of the Boards?

 

[vkung]

please send me all your test points.. i can locate the issue for you

 

[dcgibby]

Thanks Victor. I just didn't want to deal with it today. I'll look into it tomorrow. In the meantime I can listen to my TU-8900 which I enjoy very much.

 

[dcgibby]

OK, I haven't checked the voltages yet, but PTC103 is fried. I don't see anything else with visible signs of heat stress. I'm hesitant to fire it up again with an obviously bad part. Something is drawing too much current in the power supply. Should I replace the PCT then check voltages? Any idea where to get the part? I can't find it anywhere outside China (maybe Japan?).

 

[vkung]

There is a reason to damaged the PTC. You need to check all test points after you replace the PTC.

 

[dcgibby]

I can't find that part anywhere. Any ideas where I might get one?

 

[vkung]

I can give you PTC 103 UN600-200. Please check your installation before you install the New PTC 103

 

[dcgibby]

Thank you Victor. The funny thing is it played great for weeks and sounded fine even as the PTC melted down. I only noticed the problem because of the smell. Could a bad tube cause this?

 

[vkung]

The rating of the ptc is 600V and the max voltage of the amp is 400V. It is impossible to damage the ptc

 

[vkung]

You need to check the reference test points to locate your issue
This is what Mr Fujita said:
PTC does not get damaged so easily as you know.
The withstand voltage of this PTC is 600V,
and the amp voltage is max. 400V, so
it is hard to think the PTC can be damaged in any way.
It is possible that if this PTC is activated so many times
it gets easy to become active.

 

[vkung]

dcgibby... pls send me your address​

 

[dcgibby]

Victor, I sent you an email. Thanks.

 

[ucfromnj]

My unit got delivered today, Thanks @vkung Victor. Can't wait to start assembling !!

 

[vkung]

yes.. it will give your more power with KT170

 

[g2david]

Can i buy the new output transformer for my 8800?

 

[vkung]

I have LL2783C FOR TU-8800 $695 (PCB + HV CABLES INCLUDED)
EMAIL TO info@vkmusic.ca

 

[dcgibby]

Hi Victor. Just want to let you know that I got Covid shortly after you graciously sent me the part for my 8850. So I haven't had a chance to change out the part. It'll be a few more weeks until I get enough strength back, but I do appreciate your help. Thanks.

 

[vkung]

Hope you recover soon..