06-13-2006, 07:07 AM
Longer antenna than 20 ft. will be much better. The early non-AVC version may not be as sensitive as the later Model 70 with AVC.
Clean the mica wafers in the tuning gang and conpensation trimmers. Grundge and crud can impair them.
Weak tube or tubes. Check tubes with a good transconductance tube tester.
There may be moisture absorption (fairly common) in one or more RF or osc coil form that needs to be gently "baked" out if it possible.
Check for poor electrical contacts (very common) in all parts of the tuning gang assy., especially the grounding and rotor contacts.
Clean the mica wafers in the tuning gang and conpensation trimmers. Grundge and crud can impair them.
Weak tube or tubes. Check tubes with a good transconductance tube tester.
There may be moisture absorption (fairly common) in one or more RF or osc coil form that needs to be gently "baked" out if it possible.
Check for poor electrical contacts (very common) in all parts of the tuning gang assy., especially the grounding and rotor contacts.
Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com
