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Sunday, September 29, 2013

Tek Troubleshooting Triumph

Thanks to the manual provided by Jim and the HV test gear provided by Alan Wolke, I was able to finish the troubleshoot on the broken Tek 465.   It is the HV multiplier, U1432.   The cathode voltage is supposed to be -2450.   It initially tested at -1000.    The manual calls for a jumper to be removed to take the HV Multiplier out of the circuit.  As soon as I did that, the cathode voltage went to -2500.   Bingo.
Now I have to get a replacement for U1432.    Any carcasses laying around?
Thanks guys. 
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  1. Bill,

    Take this with a grain of salt.

    I believe that the part is a 6x multiplier: 2500v in to 15000v out.

    I found an old post where somebody build their own:

    "I have taken some X-Rays from one part and found that it is X6 multiplier, in contrast of the majority think to be X3. There are 6 diodes and 6 capacitors inside the block connected as a X6 multiplier.

    The capacitors are all 1400pF x 10KV and the diodes are BY8212 from Philps, 12Kv x 5mA. There are a lot of similar capacitors and diodes to sell on Ebay, and you can use these parts also."

    The topology they are using is "Cockroft-Walton voltage multiplier".


  2. http://tech.groups.yahoo.com/group/TekScopes/


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