Broken pin 22 in VFD (ice tube clock kit). Assembled kit last night. Works fine except for digit #2 (counting from right) not working. Tried known working tube from my prior kit and it works fine. Inspection of the problem tube shows internal wire #22 within the tube to be broken where it takes a bend. That's causing the grid for digit #2 to be non-functional.
Dan
Internal pin #22 wire broken in VFD tube
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- dnewman
- Posts: 15
- Joined: Fri Nov 13, 2009 5:50 pm
Re: Internal pin #22 wire broken in VFD tube
And I'm back in business....
As I was posting the picture of the broken wire, our Post Mistress called to tell me I had a package from Russia at the Post Office. (One of the advantages of living in a very small town.) So, after posting, I wandered on over through the woods and got my box of 10 VFD tubes purchased via eBay. Removed the broken tube from the PCB and then carefully cleaned the holes using copper braid and a *fine* tip on the soldering iron at about 800F. (Be very careful: it's easy on some PCBs to lift the pads. However, Lady Ada doesn't scrimp on the PCB quality.) Checked the clearances with a lead from one of the new tubes and did some more work on removing solder. Cleaned the PCB with some (near) 100% isopropyl. Placed the new tube, soldered it in, checked, clipped, reflowed, cleaned with alcohol, and produced a working digit #2.
Cheers,
Dan
As I was posting the picture of the broken wire, our Post Mistress called to tell me I had a package from Russia at the Post Office. (One of the advantages of living in a very small town.) So, after posting, I wandered on over through the woods and got my box of 10 VFD tubes purchased via eBay. Removed the broken tube from the PCB and then carefully cleaned the holes using copper braid and a *fine* tip on the soldering iron at about 800F. (Be very careful: it's easy on some PCBs to lift the pads. However, Lady Ada doesn't scrimp on the PCB quality.) Checked the clearances with a lead from one of the new tubes and did some more work on removing solder. Cleaned the PCB with some (near) 100% isopropyl. Placed the new tube, soldered it in, checked, clipped, reflowed, cleaned with alcohol, and produced a working digit #2.
Cheers,
Dan
-
- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: Internal pin #22 wire broken in VFD tube
wow! great repair work! odd that the tube showed up broken since we test 'em. that said it could have snapped in transit
looks nice tho
looks nice tho
Please be positive and constructive with your questions and comments.