Help to troubleshoot my Crack (RESOLVED :)

Ju29 · 5398

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Offline Ju29

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Reply #30 on: October 28, 2015, 01:46:44 PM
Ok removed B3 and B6 and put B3 to T9 and B6 to T7

I was able to measure only B4 (230) and B5 (238) then few seconds after there was some smoke/smell.
I think it's the resistor of 22.1K (the one the closest to the headphone plug) that started to burn...

I unplugged as soon as I realized there were some smoke. It stayed plugged for maximum 5 seconds.


Online Paul Birkeland

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Reply #31 on: October 28, 2015, 01:49:58 PM
Quote from: ju29 on October 28, 2015, 01:46:44 PM
Ok removed B3 and B6 and put B3 to T9 and B6 to T7

I was able to measure only B4 (230) and B5 (238) then few seconds after there was some smoke/smell.
I think it's the resistor of 22.1K (the one the closest to the headphone plug) that started to burn...
You must've wired something to T6 or T10 by mistake.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Ju29

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Reply #32 on: October 28, 2015, 01:57:22 PM
You're right (of course you are ! :) the alligator clip from T9 touched T10.. Argh, haven't seen it...
Measures in couple of minutes...


Offline Ju29

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Reply #33 on: October 28, 2015, 02:14:04 PM
B4 : the 10 first seconds 230 // then 80 for 3 to 6 minutes // then 89
B5 : the 10 first seconds 238 // then 170 for 3 to 6  minutes // then 194
B6 : the 10 first seconds 0 // then 103 for 3 to 6  minutes // then back to 0
T5 : the 10 first seconds 230 // then 80 for 3 to 6 minutes // then 89
T9 : the 10 first seconds 0 increase slowly to 103 // so 107 for 3 to 6 minutes // then to 119
« Last Edit: October 28, 2015, 02:16:03 PM by ju29 »


Online Paul Birkeland

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Reply #34 on: October 28, 2015, 03:07:03 PM
We will mail you a replacement 6080.  The intermittent nature may suggest that the tube is actually not properly soldered itself.  If possible, please update your forum signature with your name (first initial and last name is sufficient) so that I can get this in the mail tomorrow for you.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Ju29

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Reply #35 on: October 28, 2015, 04:07:59 PM
Ok, thanks Paul for the follow up. Appreciated. Let me know when you'll identify me with my signature. Then I'll change it after.

About the results/measures I suppose you're 100% sure of your verdict (for me the numbers I give you are just like chinese...). But if you need more tests/measurements to confirm it, just let me know and I'll proceed...

Have a good day/evening



Offline Ju29

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Reply #36 on: November 04, 2015, 06:08:51 PM
Little update of my situation...

I was to impatient to know if the tube was the issue, I ordered last week a cheap 6080 from Tubedepot.

The 6080 received 2 days later, I installed it and since... my Crack works perfectly.
So there it was... the 6080 tube...

THANKS Paul and everyone for the help to troubleshoot my Crack. The good point is that I practiced a lot (I mean a lot !) my soldering skills. I think that it helped me during the speedball upgrade I've just done tonight. So nothing happens for nothing... I've been listening for music for something like an hour tonight with the speedball upgrade and I enjoy every seconds of it.


Next step, try few others 12AU7-like tubes. But no rush, I just need to enjoy the music now...  :)


Have a good night (/day)
« Last Edit: November 04, 2015, 06:11:40 PM by Ju29 »


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