We test a pile of new plugins, and fix the king of them all: the HP 5257A 18 GHz Transfer Oscillator. While we are at it, we demo the HP 5264A Preset Unit and the HP 5262A Time Interval Unit. This completes our repair-a-thon! No kidding, we repaired them all, the main counter and 10 plugins! 5245L Repair-a-thon Playlist:    • HP 5245L Repair-a-thon   Further documentation on my website: https://www.curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there) https://www.curiousmarc.com/amazon-links - Channel merch on Teespring: https://teespring.com/stores/curiousmarcs-store - Support us on Patreon: https://www.patreon.com/curiousmarc Our lovely sponsors - PCBWay: fast turn PCBs, https://www.pcbway.com/ - Electro-Rent: https://www.electrorent.com/ - Keysight: test instruments: https://www.keysight.com/ - Samtec: connectors: https://www.samtec.com/ - R&D Microwaves: https://rdmicrowaves.com/ Get more technical info on the companion site: https://www.curiousmarc.com/ Contact info: null 00:00 Recap of previous episodes 00:43 New pile of plugins! 01:47 HP 5264A Preset Unit Plugin Test 04:11 HP 5262A Time Interval Unit Test 05:53 HP 5257A Transfer Oscillator Test 08:05 Transfer Oscillator Explanation 13:27 Fault #1 Debug 20:00 Fault #2 Debug 25:14 It works again 26:41 Now part the Apollo setup!