HP 410C VTVM (as seen with @CuriousMarc) - Part 1

HP 410C VTVM - Workshop Project #29 About a month ago, I was watching a restoration video by ‪@CuriousMarc‬he received two "identical" HP 410C VTVMs. While he tried to get both into a working state again, he mentioned that one of them was too far gone to be continued that time: it needed too much spare parts and would have to wait for some donor system. I reached out to him about maybe continuing the work on that unit? I did some transformer rewinding before after all! So, obviously, he agreed and after hammering out the details for shipping: here we are! Let's dig in! The original video by CuriousMarc is here:    • HP 410C Vacuum Tube Voltmeter Restoration   0:00 Intro / Unpacking 1:30 Overview / Disassembly / Power Switch Diagnosis 3:20 Power Switch Restoration 6:50 Rear Panel / Transformer / 7 Ohm Resistor Located! 7:50 Electrolytics 9:18 Transformer Diagnosis / Plannning 12:50 Transformer Unwind 14:10 Transformer Winding 15:40 Laminates / Validation 16:30 Case Cleaning / AC Probe Socket Clean 17:50 Waver Switch Cleaning 20:15 Power Socket Mod / Assembly Start! 21:45 7 Ohm Resistor Fix / Assembly 23:10 Unbending and Mounting Front Panel / Grounding (COM) Wire / Back Panel 24:20 Power Supply PCB / Spade Connectors 25:42 Power On! / AC Issue 27:45 Overview Part 2 / Credits / Box?! Music: My Train's A Comin' Unicorn Heads (YouTube Audio Library) You can support me on Ko-Fi: https://ko-fi.com/atkelar and also on Patreon:   / atkelar   ...and since a month, you can also drop a virtual coin into the YouTube hat by using the "Super Thanks" feature! Thanks to everybody who signed up already!