Tube doesnt display left hand top vertical bar of 8s
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Please be positive and constructive with your questions and comments.
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- Posts: 2
- Joined: Mon Nov 30, 2009 6:54 am
Re: Tube doesnt display left hand top vertical bar of 8s
Did you solder all 4 pins of the S1, S2 and S3 switches? It looks like you got the top two (closer together), but not the widely spaced bottom pairs.
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- Posts: 106
- Joined: Mon Nov 23, 2009 10:10 pm
Re: Tube doesnt display left hand top vertical bar of 8s
Check the soldering of the vacuum tube to the sub-circuit board. Some of the connections look dodgy, so I'd suggest reheating them all and adding some solder where needed.
I'm suspicious of your connection to pin 12, the Segment A Anode (or maybe it is pin 10, the Segment B Anode). I think that's the segment that isn't lighting up. Pin 12 is the first pin on the top of the tube, towards the front (pin 10 is two forward of that).
You also seem to be missing the second a in alarm (as you suspected). This is pin 22 on the tube, on the bottom right, the cathode for the entire digit 2 grid.
I'm suspicious of your connection to pin 12, the Segment A Anode (or maybe it is pin 10, the Segment B Anode). I think that's the segment that isn't lighting up. Pin 12 is the first pin on the top of the tube, towards the front (pin 10 is two forward of that).
You also seem to be missing the second a in alarm (as you suspected). This is pin 22 on the tube, on the bottom right, the cathode for the entire digit 2 grid.
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- Posts: 6
- Joined: Mon Aug 30, 2010 3:38 pm
Re: Tube doesnt display left hand top vertical bar of 8s
How/did this problem ever get resolved?
Please be positive and constructive with your questions and comments.