[Chas]

The NULL is the correct response when neutralizing a common TRF. If the adjustment is not working something is wrong in the circuit(s). The correct tuner frequency to neutralize may not be the one specified. So if the set still oscillates at a certain receive frequency, neutralize at that frequency. All shields must be in place, if a bottom plate is used be sure it is on too. Do not work on a metal bench raise the radio a couple of inches if a metal bench is in use and there is no bottom plate required. it is best to keep the tubes in their respective positions once the set is neutralized.


Be sure the filament voltage is correct at all the 26 tubes, poor connections are a problem for those high filament amp tubes.

GL

Chas