Tuner & Chassis Restoration - 94 year old Philco Mod. 20 - 1930 - Vacuum Tube TRF Radio - Pt 5 [4K] 

Part 5 - Chassis and Electrical Restoration with complete Tuner Tear Down and Restoration for this now 94 Year Old Philco vacuum tube radio is a Tuned Radio Frequency or TRF design which pre-dates Superheterodyne radios in the market place. The first superhet was sold in 1924 according to wiki, but TRFs were still sold for a few more years to come.
In Parts 1 and 2 we thoroughly evaluated this old radio and at the end of Part 2 we even got it to work and receive radio stations! But it still is not able to come off the work bench as you will see. But we fixed it first. In Part 3 we did a repair and restoration of the power transformer. In Part 4 we did a repair and restoration of the power switch. Now let's see if we can do a complete restoration of the chassis and tuner assembly. PLUS some info on galvanic corrosion cells - friend or foe?
This came to me via a friend and was owned by his Uncle who had intended to repair and restore it but never did get to it. Let's get her working.
See the checklist which appears when status changes, for tracking what is discovered that needs addressing in Red, followed by Green when resolved.
NOTE: This is not instruction, it is for entertainment for people like me who enjoy watching projects and the experiences gained. If you attempt to do any of the things in this video you are at your own risk. I am using special tech-bench safety equipment not detailed here so don't take for granted you can just plug these old items in safely without them being checked and repaired correctly. Check out the link below to Mr Carlson's Lab video below.
ACKNOWLEDGEMENTS AND REFERENCES:
[note: am in no way representing how these folks have shown doing these things - I don't even think they would approve.]
Schematics: NostalgiaAir.com, philcoradio.com
Replacement Dial: Radio Daze
Thanks to shango066 for championing the approach of "fix it first", before mass re-capping. See shango066 for many examples of that approach.
@shango066
Awesome discussion of bench safety including variacs and isolation transformers by Mr Carlson's Lab (highly recommended):
• Tech Tips Tuesday, Iso...
‪@MrCarlsonsLab‬
Modification method for a commercial Tripp Lite isolation transformer for tech-bench use by Todd Harrison, his channel is called ToddFun:
• ToddFun.com: Isolation...
‪@ToddFun‬
Camera: Canon G7X Mark III
Mic: Rode Micro
Video Editing Software: Power Director
Video Editor: just me
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