05-26-2017, 08:49 PM
That does sound like a 51K resistor. 
The Nostalgia Air schematics leave something to be desired, so you may find the service bulletin a bit easier to work with: Philco Service Bulletin No. 057A.pdf
You can remove the tuner to clean it - not a problem but I wouldn't mess with the alignment trimmers on it without carefully noting their position or capacitance value so that the set won't be too far out of original alignment when you put it back together.
How are you planning to clean it? I've taken tuners off of Philco 70 and 90 models to derust in Evaporust. That works pretty well.
It any case I'd also wait to do that until everything else on the radio is working well so that by the time you mess with the tuning condenser you don't inadvertently also trip over some other marginal issue at the same time and make any problem hard to diagnose.
The Nostalgia Air schematics leave something to be desired, so you may find the service bulletin a bit easier to work with: Philco Service Bulletin No. 057A.pdf
You can remove the tuner to clean it - not a problem but I wouldn't mess with the alignment trimmers on it without carefully noting their position or capacitance value so that the set won't be too far out of original alignment when you put it back together.
How are you planning to clean it? I've taken tuners off of Philco 70 and 90 models to derust in Evaporust. That works pretty well.
It any case I'd also wait to do that until everything else on the radio is working well so that by the time you mess with the tuning condenser you don't inadvertently also trip over some other marginal issue at the same time and make any problem hard to diagnose.
