Tube doesnt display left hand top vertical bar of 8s

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gunderwood
 
Posts: 2
Joined: Mon Nov 30, 2009 6:54 am

Re: Tube doesnt display left hand top vertical bar of 8s

Post by gunderwood »

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.

Rotzog
 
Posts: 106
Joined: Mon Nov 23, 2009 10:10 pm

Re: Tube doesnt display left hand top vertical bar of 8s

Post by Rotzog »

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.

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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).

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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.

conrthomas
 
Posts: 6
Joined: Mon Aug 30, 2010 3:38 pm

Re: Tube doesnt display left hand top vertical bar of 8s

Post by conrthomas »

How/did this problem ever get resolved?

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