Right channel issue TU8600 anyone have a copy of the manual?

[Kyngfish]

I’ve had this amp for about 5 or 6 years and it’s been mostly good. For the past year or so I get a weird right channel where it sounds quiet but distorted. Or it’s just super quiet. I swapped tubes and it’s still the same channel. Problem was occasional. Now it seems to be getting worse.

I’m about to pull it out and run through the testing again but I no longer have the assembly manual. Anyone have a copy?

Also welcome any ideas on how best to troubleshoot.

 

[anatech]

What brand is it?

 

[rayma]

https://www.elekit.co.jp/en/product/TU-8600

Try here for the manual:
https://www.elekit.co.jp/en/manual/

 

[vkung]

Hi Kyngfish
Please send me all test points.. I guess you have R Version.

 

[Kyngfish]

@vkung Voltage at all test points?

Yes. It is the TU8600R I think. I purchased one of the very first batches I think. Lundhal version. Can you send me the manual so I can do the test points? It’s been too many years. So I would like to follow instructions.

 

[Kyngfish]

https://www.elekit.co.jp/en/product/TU-8600

Try here for the manual:
https://www.elekit.co.jp/en/manual/

The manuals are asking for lot number and another number. None are on the amp itself

 

[rayma]

Ask vkung about that.

 

[vkung]

That is a link made available for oversea customers in Japan
who bought robotic items.
We do not make our amp manuals downloadable from the site.

 

[vkung]

you can find the test point from the pcb..
i can send you the ref test point..pls send your email to info@vkmusic.ca

 

[Kyngfish]

Finally got around to doing this

 

[vkung]

your amp should work..

 

[Kyngfish]

Haha. Yeah. No kidding? I guess it could be the speaker. I will test that.

 

[vkung]

if your headphone has sound.. it means the your speaker system has issue

 

[vkung]

use headphone to test the amp
your tp24 is too high

 

[Kyngfish]

What is a possible reason for the TP24 being too high?

 

[vkung]

there are a lot of reasons ... it is still 5-10% range. i prefer no more than 5%

 

[Narrowfellow]

@Kyngfish did you resolve this issue? I'm having a similar issue with mine, but left channel. Still working through troubleshooting cables, interconnects etc...

 

[Kyngfish]

I tested the amp and it checks out (voltages). The problem goes away when I move the tubes around so either the sockets are bad or need to be reflowed - which I already did and it came back. Or maybe the tubes are just getting old. Honestly I don’t know.

For now there’s no problem. I’ll eventually get new tubes and try to chase it down but right now my laundry list of **** to do is long and this isn’t at the top

 

[Narrowfellow]

Sounds like you fixed it! I may need to dive into mine and recheck the soldering. Thanks.