Crack Troubleshooting - Fuse blowing Noise [resolved]

kl3zero · 1453

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Offline kl3zero

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Hello I just finished build my crack and am having an issue with the fuse blowing.
The initial and secondary transformer tests and glow test were all good and final resistances are matching exactly.

After rechecking all connections and fixing any solder joints that seemed iffy I am still experiencing the same problem.
This was my first time soldering in a few years but only seemed to have some issues getting the leads cut as short as I wanted and some accidentally bumping of wires with the iron.
I also had one of the ends snap on the LED on B2 so its soldered to the center pin quite close but still glows checking with an ohm meter.
The unit is making a noise when plugged in, stopping im assuming when the fuse blows about 2 seconds later.
On my second attempt I was able to confirm the IEC voltage was the same as the initial test at 122V.
I made sure there was no loose wires or stray pieces and nothing close enough to touch that shouldn't.
Let me know if you have any suggestions.


[url]album[https://imgur.com/a/rT9HgCk/url]
« Last Edit: April 13, 2019, 02:43:59 PM by Paul Birkeland »



Offline Paul Birkeland

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Reply #1 on: April 13, 2019, 12:00:33 PM
I would start by posting some photos of your build.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline kl3zero

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Reply #2 on: April 13, 2019, 12:05:00 PM
There added now. Was still uploading them
Oh one other mistake I know I made was using a black wire instead of red from B1 to 5U. I just have not replaced that yet since it should not impact the amp working properly.
« Last Edit: April 13, 2019, 12:08:07 PM by kl3zero »



Offline Paul Birkeland

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Reply #3 on: April 13, 2019, 12:11:00 PM
Your power transformer is improperly wired.  See page 40 in the manual.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline kl3zero

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Reply #4 on: April 13, 2019, 01:36:14 PM
wow thanks so much paul not sure how I missed that.
Made the proper connection and threw in a extra fuse I had and it started right up with both tubes glowing!
Did the voltage check and everything measured perfectly so seems like that was my only issue.


Just started listening and no noise or hum so seems like its good to go.
Thanks again for the help!