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Author Topic: 811 h problem.  (Read 1269 times)
N4ZY
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Posts: 87




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« on: November 12, 2009, 02:43:40 PM »

i have a problem with  a 811 h. i lose filiment supply to  ( A ) tube. now this could be socket  B today  and may be socket C tommorow. retubed the rig  after using a few mins  here we go again. not that bright to figure it out! any help???
                     Jim N4ZY
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KA5N
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Posts: 4380




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« Reply #1 on: November 12, 2009, 03:15:26 PM »

I would suspect a loose connection somewhere.  Perhaps the tube sockets are defective (not enough spring tension in pin recepticles).  Maybe bad solder joint.  
Just trouble shoot.
Allen
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W8JI
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« Reply #2 on: November 12, 2009, 04:07:45 PM »

After you make sure HV is down and off, pull the intermittent tube and swap it with one of the sockets that is staying on. If the problem moves with the tube, it is a bad tube. If the problem stays in the same socket or goes away and stays away, it is probably the socket or socket connections.

It is pretty common to have a bad solder joint in the tube pins. It also might be in the socket or socket connections. Moving the tube will tell you a lot.

Tom
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