38-9 Restoration

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The Beginning
Don't Plug it In
4.  What Needs Replacement?
The Plan

 1.  Get the Data

 2.  Block Diagram

 3.  Pre-Flight Checks

 4.  What Needs Replacement?

 5.  Ordering Parts

 6.  Install Electrolytics

 7.  First Power-On Checks

 8.  Triage Problems - more trouble!

 9.  Complete Electrical Restoration

10.  2nd Pre-Flight and Power-On, and The Last Problem

Additional Resources

 o  Antenna in the attic

 o  Shortwave Listening Guide

 o  Philco and Radio History

 o  Other Links

 

A) Capacitors
Standard advice is to replace all electrolytic capacitors, and any paper capacitors that look swelled, cracked, or overheated.   That's practical. 

In this case, though,
a) There are only a dozen paper caps in addition to three electrolytics,
b) I had reason to suspect some of these paper caps, and
c) I'm a glutton for punishment.
So I decided to replace all of the capacitors (except for 3 Mica caps).  

B) Resistors
While I'm pulling out all of the caps, and many of the resistor connections would be reworked in the process, I decided to replace all of the resistors as well.  My pre-flight check had uncovered several resistors that were off by > 20%, so spending another hour or so soldering seemed like a good investment.

C) What about Tubes? 
One thing that dogged me was that I had no way to check out the tubes that I had.  I called several local TV repair shops expecting someone to still have a tube tester, but they just made me feel old.  

Near the end of the project I joined NJARC, and was able to check out all of the tubes during a repair clinic.  Happy days!

 

 

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Lilian Vernon
Copyright 2004 look4000@verizon.net 
Last modified: November 01, 2008