Troubleshooting for the Elekit TU-879S 6L6GC

gstebbins · 11th February 2012, 08:32 PM

I bought a TU-879S from the kind and professional Victor Kung (vkung) about two weeks ago. It arrived last week and I built it last weekend. After about 10 hours of meticulous assembly, I flipped the switch only to see absolutely nothing happen. I checked to make sure all 3 tubes were seated properly, flipped the on/off switch a few times, and let it sit in the on position for a while, all with no luck.

I was extremely careful with placing and soldering each of the parts, especially those with polarity, and I've checked the board many times to make sure my solders 'look good.'

That said, I am no electrician, and this is my first serious soldering project.

I have a multimeter at my disposal, and I've had recommendations to test for continuity, so that is my next step. Is there anything else I'm overlooking?

I know I can contact Victor directly -- he offered his time and help from the start, but I figured a post to a forum would benefit others, and I've seen no other troubleshooting thread.

Thanks all!
Grayson

Minisemi · 11th February 2012, 09:01 PM

maybe you have a part,like a diode,or a tube in the wrong polarity...

gstebbins · 12th February 2012, 12:06 AM

That's possible. I was extremely careful with getting the polarity right and making sure I double or triple checked everything.

What are the odds of bad parts with Elekit kits?

dja1922 · 13th February 2012, 01:47 AM

Just a quick check of the fuses - very easy to get the .3 amp in the place where the 2.0 amp should be. (This happened to me the first time and I didn't hear the fuse open up). There should be an extra pair of fuses in your kit, they are just hard to see the stamped indication on the end caps of the fuse. Hope this is an easy fix?

gstebbins · 17th February 2012, 10:46 PM

Got it to turn on!

I'll try hooking it up to a source later tonight

There was a cold solder on the on/off switch. My boss is good with electronics and gave me a hand -- he saw that the solder looked bad right away, we tested it with the multimeter, and sure enough it was.

Hopefully it's fully working when I get home!

PS - regarding fuses: I checked those multiple times -- all good. Now there's proof

dja1922 · 17th February 2012, 11:02 PM

Glad to hear that is all it was. Enjoy!

11th February 2012, 08:32 PM	#1
gstebbins diyAudio Member Join Date: Feb 2012	Troubleshooting for the Elekit TU-879S 6L6GC I bought a TU-879S from the kind and professional Victor Kung (vkung) about two weeks ago. It arrived last week and I built it last weekend. After about 10 hours of meticulous assembly, I flipped the switch only to see absolutely nothing happen. I checked to make sure all 3 tubes were seated properly, flipped the on/off switch a few times, and let it sit in the on position for a while, all with no luck. I was extremely careful with placing and soldering each of the parts, especially those with polarity, and I've checked the board many times to make sure my solders 'look good.' That said, I am no electrician, and this is my first serious soldering project. I have a multimeter at my disposal, and I've had recommendations to test for continuity, so that is my next step. Is there anything else I'm overlooking? I know I can contact Victor directly -- he offered his time and help from the start, but I figured a post to a forum would benefit others, and I've seen no other troubleshooting thread. Thanks all! Grayson

17th February 2012, 11:02 PM	#6
dja1922 diyAudio Member Join Date: Nov 2011 Location: Asheboro, North Carolina	Great fix Glad to hear that is all it was. Enjoy!

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11th February 2012, 09:01 PM	#2
Minisemi diyAudio Member Join Date: Nov 2006	maybe you have a part,like a diode,or a tube in the wrong polarity...

12th February 2012, 12:06 AM	#3
gstebbins diyAudio Member Join Date: Feb 2012	That's possible. I was extremely careful with getting the polarity right and making sure I double or triple checked everything. What are the odds of bad parts with Elekit kits?

13th February 2012, 01:47 AM	#4
dja1922 diyAudio Member Join Date: Nov 2011 Location: Asheboro, North Carolina	Just a quick check of the fuses - very easy to get the .3 amp in the place where the 2.0 amp should be. (This happened to me the first time and I didn't hear the fuse open up). There should be an extra pair of fuses in your kit, they are just hard to see the stamped indication on the end caps of the fuse. Hope this is an easy fix?

17th February 2012, 10:46 PM	#5
gstebbins diyAudio Member Join Date: Feb 2012	Got it to turn on! I'll try hooking it up to a source later tonight There was a cold solder on the on/off switch. My boss is good with electronics and gave me a hand -- he saw that the solder looked bad right away, we tested it with the multimeter, and sure enough it was. Hopefully it's fully working when I get home! PS - regarding fuses: I checked those multiple times -- all good. Now there's proof