HP 5245L Nixie Counter - Part 3: 500 MHz Plugin Repair (HP 5253A and HP 5253B)

It's time to repair our 500 MHz frequency converter plugins, the HP 5253A and HP 5253B. It says in red letters: "CAUTION: DO NOT ATTEMPT DISASSEMBLY OF CAVITY". Really? Guess what we are going to do!

5245L Repair-a-thon Playlist:    • HP 5245L Repair-a-thon  

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00:00 Summary of previous episodes
01:00 The many plug ins for the HP 5245L
02:25 Making the extender cable
03:06 HP 5253 converter principle of operation (with elevator music)
07:58 Inspection and tryout of our first HP 5253A plugin
10:56 Summary of the first HP 5253B repair
11:27 Taking apart the second HP 5253A
14:02 Stuck gearing repair
15:37 Disassembling the "Do Not Disassemble" microwave cavity
19:13 Coaxial resonant cavity explanation (with elevator music)
23:05 Reassembling the cavity
26:19 Testing the repaired HP 5253A plugin
27:15 Comparing with the second HP 5253B cavity
28:26 Testing the second HP 5253B plugin