Philcoradio.com Tech Section
This section of the Philcoradio.com website is provided to assist you in servicing your own Philco.
A large number of articles may be found here. Some of these articles may be applicable to Philco models other than the one(s) listed. As an example, other Philco sets may develop a bad mica condenser in the oscillator circuit as presented in the No Reception Problem in Model 90 service hint. Please look through all of these. You will find a great deal of helpful information here.
The following is a complete list of tech articles available on this site.
Evolution of popular Philco Models, with all documented (and some undocumented) changes explained:
Notes on Models 20, 21, 70 & 90:
Error in Model 90 (1-47) Service Data
Correct IF Frequencies for Model 90
Notes on Model 21
The Speaker Problem in early Philco Cathedrals
Tuning Condenser Wiring Trouble
Unusual "No Reception" Problem in Model 90
Notes on Models 86, 87 & 511 Series:
A Fix for Warped Mystery Control Dials
Audio Interstage Transformers
Call Letter Tabs for 1941 and 1942 Philco Models New!
Capacitors with Three Leads in Postwar AM-FM Philco Sets
Connecting Cable Hookup, Models 14LZX, 19LZX, 19TX & 91RX
Dial Cord Replacement for Early Philco Radios
Dial Cord Stringing Diagram - Models 14, 17, 18, 22, 23, 43, 47, 49, 71, 91, 118
Dial Drive Rebuilding, Models 16, 34, 44, 144
Dial Drive Rebuilding, Models 116, 640, 643, 645, 650, 651, 655, 660, 665
Error in Model 38-690 Tweeter Wiring
How to Decipher Philco Resistor Part Numbers
Loctal Socket Problems and Their Cure
Philco Bakelite Block Condenser Data
Replacing the Off-On-Band Switch, Philco Models 14 (early), 19, 89 & 91
Rewiring Philco Pilot Lamp Sockets (1937-42 models)
Rubber-Covered Wiring in 1939-1942 Philco sets
Should I Plug It In and Turn It On?
Undocumented Changes in Model 116
Suffix Letters in Philco Model Numbers
Stewart Schooley's Photofinish Repair
The pages outlining photofinish repair techniques developed by the late Stewart Schooley are now part of Philcoradio.com! If you have a Philco radio that used photofinish, and are wondering how to repair this finish which is often damaged and in poor condition, you can learn helpful techniques here.
Turning a Rusty 71 into a "Super" 71
Turning an Equally Rusty 89 into a "Super" 89
Convert the Oscillator Circuit of a 19, 71, 89 or 91 to use a 6A7 Tube
The Plaskon 38-12 Had A Great Fall...
Model 41-226, or "The Sled"
These articles are intended for the more experienced collector. If you are just getting started in collecting and restoring your own radios, it is suggested that you visit the following website for some helpful beginner advice:
Phil's Old Radios - The Radio Beginner
It would also be a good idea for you to invest in some books dealing with the repair of vintage radios. Visit the Philcoradio.com Bookstore, which features many of these.
Wondering how to restring that dial cord? There is an online resource which covers many (not all) of the Philco sets made between 1939 and 1946, along with those of all other major manufacturers. It is located at The Old Radio Fixer-Upper Guy's website.
More Philco service hints may be found at the Philco Repair Bench.
Are you in need of parts, tubes, schematics, supplies, etc. for your Philco or other radio? Please visit the Resources pages on this site.
These hints and tips are provided here as a convenience to our site visitors. Use them at your own risk. A solid working knowledge of vintage electronics is essential in using these hints and tips. If you do not feel comfortable troubleshooting your own set, I strongly suggest you invest in several good books on the subject of servicing antique radios and study these as you practice on an unwanted radio, until you feel comfortable working on them. Old radios contain high voltages that can injure and/or kill! Ron Ramirez shall not be liable for any loss, inconvenience or damage, including direct, special, incidental, or consequential damages, resulting from the use or misuse of the technical hints and tips presented herein.