It was in late 2021 when I was browsing ebay for a decent LRC (or RLC) metering device. Originally, I thought I'd go for a cheap-ish digital one, but then this little gem of a retro device popped up for rather cheap. It was cheap mostly because it was untested and had at least one stuck knob. Sounds like a challenge to me! The device itself is based on a Wheatstone / Wien bridge circuit and allows very precise measurements of resitsors, capacitors and inductors: R, C and L. I always mix up the sequence of these letters in the product names and I'm sure there are multiple versions out there... LRC? RLC? Doesn't really matter: all three of them! I did the usual recapping and cleaning, although internally not much cleaning was needed. Wow. It looked brand new inside! I am also not sure if the device originally came with a cover; the case has attachment points for something along these lines on the side, but the manual doesn't indicate one way or the other. Making one might be a neat build project at a later time maybe. I'll keep it on my list of things to do! It would be interesting to see how accurate the thing is. If I ever get to some calibration lab, I'll be sure to bring it along. All test measurements were agreeing in magnitude and first significant digits with my other means of checking them. The 3rd and 4th digit is where I can't confirm anthing sadly. But since I didn't change anything on the precision resistors and the reference cap, I'd assume it's at least in the "more than OK for hobby use" range. And before you ask: yes, the "restored by Atkelar" sticker is ever so slightly crooked again. At some day I might get lucky and manage the proper alignment before the sticky side starts to stick to a freshly painted case. 0:00 Intro / Presentation / Inspection 1:31 No Batteries? 2:05 Open Case / Shiny! / Strategy 3:16 Golden Tin Can? / Binding Posts 4:28 Triple Potentiometer 5:16 "Dekastat(tm)" 5:46 Cleaning / BNC / GAIN potentiometer 6:57 D-Q Potentiomater Assembly / Recapping P2P 7:42 Strange Capacitors 8:21 Delete Charger / Battery Tube 9:51 Case Refurbishing 10:42 Reassembly! 11:40 D-Q deba-q-le... 12:22 D-Q wiper adjustment / Tidbits and Dials 13:17 Chassis Layer 2 13:55 Test #1: Batter Check 14:11 Bridge Circuit, Rough Theory 15:36 Resistor... 16:21 Capacitor... 17:18 Inductor Measurement 17:38 D/Q and ESR math overview 18:57 Case Finish 19:51 Done! Overview / Bye / Credits / Outtakes Music: My Train's A Comin' Unicorn Heads (YouTube Audio Library) You can support me on Ko-Fi: https://ko-fi.com/atkelar Useful links that I found via Google that were helpful for this project: Wheatstone Bridge: https://en.wikipedia.org/wiki/Wheatstone_bridge Wien Bridge: https://en.wikipedia.org/wiki/Wien_bridge Historical account for the Wheatst ... https://www.youtube.com/watch?v=_BR6oW8zcMg

Restoration Project #42 - PE Musical 5V - Part 1 My first ever restoration was my grandfather's old tube radio. I did that one before I made videos, so it isn't anywhere up here, sorry. It does have a "phono" input on the backside and that always fascinated me: how about a record player that fits the time period? And so I scouted all over the net for affordable ones. Mind you, I wanted something to restore and just for fun... so paying three digit amounts plus shipping was out of the question here, otherwise I would have found it way sooner. Cue last year: a friend in Germany poked me and asked if I would be interested in a lot of old record players that somebody in his neighborhood offered "free for pickup". And one of them fit the bill! So I paid shipping only on this... ...and now follow me on the first part of the two part series to find out just why it was free. 0:00 Intro / Presentation 1:13 Opening up the case / First Impressions 2:39 Discovering Model Details / Motor Stator-Status 4:00 Rebuilding the Stator 5:39 Rotor Cleanup and Run Capacitor 7:35 Motor Trials / Resistor Issue 8:53 Amplifier Section / Transformer Issue 10:20 Rewinding- / Repacking Transformer 11:20 Amplifier Start / Audio Transformer 13:05 Speaker and Transformer / Recapping Start 14:30 Volume Potentiometer Repair 16:19 Capacitor Replacement 17:36 Rectifier Replacement 18:27 Fuse Holder Board 20:08 B+ Go! But... 20:30 ...Finally! / Goodby / Outtake Music: My Train's A Comin' Unicorn Heads (YouTube Audio Library) You can support me on Ko-Fi: https://ko-fi.com/atkelar ... https://www.youtube.com/watch?v=IwE1ogVOrB8