Pioneer SX990 - Repair & Restoration - 1 of 3

In this video, I repair and restore a very dirty Pioneer SX-990 audio receiver which was made in 1970. I hope you enjoy the video and I thank you for watching!
This is my very first attempt at many things all at once. The first challenge is learning how to use Davinci Resolve to create videos. The second and continuing challenge is learning the actual filming process and learning about mics, angles, and lighting. Fun stuff indeed.
TEST / MEASURING EQUIPMENT
👉 Panasonic VP7725B Audio Analyzer: tinyurl.com/5n...
👉 HP 8903B Audio Analyzer: tinyurl.com/wd...
👉 HP 8904A Multifunction Synthesizer: tinyurl.com/5n...
👉 HP 5342A Microwave Frequency Counter: tinyurl.com/fu...
👉 RIGOL DHO924S Oscilloscope: tinyurl.com/29...
👉 OWON HDS2202S Oscilloscope: tinyurl.com/2e...
👉 Sencore SC3100 Waveform & Circuit Analyzer: tinyurl.com/4a...
👉 Sencore PR570 Variable Isolation Transformer: tinyurl.com/3s...
👉 Sencore PA81 Audio Analyzer: tinyurl.com/4d...
👉 Sencore LC102 Capacitor-Inductor Analyzer: tinyurl.com/yw...
👉 Junktek PSG9080 Arbitrary Waveform Generator: tinyurl.com/28...
👉 Fluke PRO3900F60 Probe: tinyurl.com/36...
👉 Fluke 45 Dual Display Multimeter: tinyurl.com/yc...
👉 Fluke 189 Multimeter: tinyurl.com/bd...
👉 Fluke 85 Multimeter
👉 Peak Atlas DCA75 Pro: tinyurl.com/2x...
👉 DER EE DE-5000 LCR Meter: tinyurl.com/ze...
👉 Capacitor Wizard: tinyurl.com/4j...
👉 EICO 145 Signal Tracer: tinyurl.com/yj...
SOLDERING / DESOLDERING
👉 Hakko FR-301 Desoldering Tool: tinyurl.com/4u...
👉 Hakko FX-9701 Soldering Handpiece: tinyurl.com/ya...
👉 Hakko FX-972 Dual Port Station: tinyurl.com/35...
👉 Hakko T39-D24 Chisel Tip: tinyurl.com/bd...
👉 Hakko T39-BC2040 Bevel Tip: tinyurl.com/cb...
👉 Hakko 852 SMD Hot Air Rework System: tinyurl.com/3r...
POWER SUPPLIES
👉 Keithley 2231A-30-3 Power Supply: tinyurl.com/y6...
👉 WANPTEK DC Power Supply: tinyurl.com/yb...
VIDEO / AUDIO
👉 DJI Lavalier Microphones: tinyurl.com/yc...
👉 Sony A6100 4K Camera: tinyurl.com/pw...
👉 Apple iPhone 12 Pro Max
👉 Apple iPhone 12 Pro
👉 Elgato Lighting: tinyurl.com/48...
MISCELLANEOUS
👉 EIWEI 15L Ultrasonic Cleaner: tinyurl.com/mt...
👉 PCB Holder (Velleman VTHH6): tinyurl.com/3p...
👉 TOMLOV TM4K Microscope: tinyurl.com/2v...
👉 KAIWEETS KTI-W01 Thermal Camera: tinyurl.com/4b...

[@brunoprimas1483]

Good call on those bias trimmers. I've rebuilt more than a few of the early Pioneers, and about 40% of them come to me with bad bias trimmers and shorted outputs. Love the sound. I have an SX-2500, which I won't be parting with.

[@Wil_Bloodworth]

I probably should’ve replaced the rest of them while I was in there. Thanks for watching.

[@brunoprimas1483]

@@Wil_Bloodworth I have never seen a DC balance trimmer go bad in this series. Go figure.

[@peterclissold6]

This new channel is off to a terrific start. Well done! I look forward to parts two and three.

[@TheMakerShopTech]

Thank you Peter! I hope I don't disappoint.

[@PhilipsN2552]

I have owned two of these. And yes, these sound great!

[@TheMakerShopTech]

They certainly do. I was going to give this one to a family member but she passed away unexpectedly. Now, I don't know if I want to hang onto it or just sell it and get it out of the house.

[@paulborodea4957]

I would replace all trimmers, they fail often. In my SX-990 I used BC161/141 for TO-39 transistors. Good job!

[@TheMakerShopTech]

That is a great idea Paul. Not sure why I didn't think of that. Thank you!

[@Daltondoubledeuce]

Woo hoo comment #1 and subscriber #3 💪🏼. Got a feeling this is gonna be a great channel, love these helpful vintage audio repair vids.

[@TheMakerShopTech]

Thank you very much for both commenting and subscribing!

[@Daltondoubledeuce]

@@TheMakerShopTech really looking forward to seeing the next episode.

[@TheMakerShopTech]

@@Daltondoubledeuce you're in luck as I just released video #2 last night. :)

[@sretchko]

Hi Wil, Excellent vid! What is the frequency of your Ultrasonic cleaner? I have damaged some solid aluminum knobs using an ultrasonic cleaner that is 40kHz (55c for 20 min) and read that you need 78kHz for aluminum.

[@TheMakerShopTech]

Hi Steve, it's 40kHz. I haven't heard about the 78kHz cleaners so I will look into that. Thank you for watching and the comment!