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Restoration Project #34 - Revox A72x - Part 1

About half a year ago, Emil - an online friend from Germany - asked if I would be interested in saving a Revox A720 receiver/pre-amp from the scrap bin - it would need some TLC and repairs but would be "shipping only" otherwise. As I was looking for a pre-amp to connect with my turntable, I took up the offer right away! It did look interesting, even though I never heard from that brand much less that particular model before... It was indeed in need of repair: some buttons were missing and both sliding pots were busted off... the 12kg of the unit had a lasting impact on them for sure! Eventually, that model did grow on my however and I did my best to find a matching power amplifier to go with it... but when I found out that these things go for 500+ Euro a piece on e-bay, I did not hope for any affordable one; I certainly didn't expect a free one like the pre-amp... But then, an "untested" one appeared for just-barely-within painful-but-affordable range and I got it about a month ago: time to start that project! In this episode, I cover the disassembly and recapping of both units; the assembly, adjustment overview and troubleshooting will be in the next one! 0:00 Intro - Presentation / Unpacking 1:35 Look Inside / Botches? 3:18 Broken Stuff / Disassembly 4:32 Transformer Mishap / Input PCB / Botch #2 6:08 Button Board / Switch Board 6:38 Tuning Matrix Disassembly 7:35 Wiring Loom Nastyness / Input PCB Refurbishment 9:00 Power Supply PCB 10:18 Tuning Knob Explanation / Manual Tuning Assembly 12:00 Preset Switches Disassembly / Button Cleaning / Relay Cleaning 13:55 Volume and Balance Potentiometer Repair 15:08 Wire Loom Repair / Tuning Meter Issue 16:39 A720 and Audio Output? Presenting the A722! 17:42 Smoked Amp? 18:24 Power Amp Stage Recapping and Potentiometer 19:37 Fresh Thermal Paste (after a good scrub!) / Speaker Relay Cleaning 20:40 DC Filter Caps / Cleaning Flux 21:37 To be continued... Music: My Train's A Comin' Unicorn Heads (YouTube Audio Library) You can support me on Ko-Fi: https://ko-fi.com/atkelar