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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 18th June 2017, 09:20 AM   #1
capitanalga is offline capitanalga  Spain
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Default R2 fire - blown

Hi there,

Something horrible happened... after two years of work, I managed to finish my sse. Everything checked, apparently everything ok.. when I turn on, check light turns on and valves start to glow. After, let's say 15 seconds, R2 burns with fire. I will post some pics later (but there is actually not more to see than what's described). R2 was 150ohm 3w 5% axial (23J150E-ND). My questions:

1- what can cause r2 to burn?
2- I have desoldered r2, will just replacing r2 work?
3- what should I check?
4- should I start a brand new pic?

Thanks and best regards!!
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Old 18th June 2017, 09:49 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Schematic? Where does R2 sit? Photo?
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Old 18th June 2017, 10:24 AM   #3
capitanalga is offline capitanalga  Spain
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Hi, thanks for quick reply. Find attached photos. What do you mean exactly with schematics, what should I post? I have configured like that: [http://www.tubelab.com/images/Assemb...ode_noCFB.jpg]

Thanks and sorry if my questions are to obvious!

IMG_3080.JPG.jpg

IMG_3081.JPG.jpg

IMG_3082.JPG.jpg
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Old 18th June 2017, 05:10 PM   #4
mkane77g is offline mkane77g  United States
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R2 fire - blown
I'm not trying to be a wise guy but some of those solder joints are in serious need of attention. I would double check everything.
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Old 18th June 2017, 05:48 PM   #5
capitanalga is offline capitanalga  Spain
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Quote:
Originally Posted by mkane77g View Post
I'm not trying to be a wise guy but some of those solder joints are in serious need of attention. I would double check everything.
Sure! Thanks! How could you check them? And if they're not good? Desolder and solder again?

Thx!
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Old 18th June 2017, 06:05 PM   #6
Nikon1975 is offline Nikon1975  Austria
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R2 should be 150K not 150 ohm. if it was 150 it tried to dissipate almost 1000w

D.
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Old 18th June 2017, 08:14 PM   #7
JMFahey is offline JMFahey  Argentina
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Please post a readable schematic, I am unable to open the Tubelab page (page not found), maybe itīs available only to members.
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Old 18th June 2017, 08:33 PM   #8
Nikon1975 is offline Nikon1975  Austria
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Be sure you did not swap R1 and R2, if you did not use a choke. The bad news is that you might have damaged the rectifier. The good news is that all the rest should be intact.

D.
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Old 18th June 2017, 08:39 PM   #9
vinylkid58 is online now vinylkid58  Canada
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Quote:
Originally Posted by JMFahey View Post
Please post a readable schematic, I am unable to open the Tubelab page (page not found), maybe itīs available only to members.
Here's the main page: Tubelab SSE | Tubelab

jeff
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Old 18th June 2017, 09:09 PM   #10
JMFahey is offline JMFahey  Argentina
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Thanks
I was actually expecting this being posted here:
Click the image to open in full size.

instead of having to navigate an external page, but hey, better than nothing

And yes, *seeing* the schematic itīs easy to imagine what happened.

Hope the rectifier is fine .
Maybe the SS/Tube switch was ON and the SS diodes took the surge.

As a side comment, is that amp finished?
I see lots of too long cable all over the place, some of it with free ends.

As of soldering, itīs really hard to solder well with mandatory lead free type, canīt you get a little old style one somewhere?
A tiny bit of it added to each already soldered junction will make it way more reliable.

In any case, congratulations on your build and welcome to a fascinating Hobby
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