With a VOM you can check the filament continuity and for shorts between elements. When testing in the rig, along with the usual measurements, you can look at off-resonance plate current — briefly. Shouldn't take too long to sort them out. Just make sure the HV is off between iterations.
This amp is from the '57 ARRL Handbook and should do 120 watts AM. It could also be used as a Novice rig by removing one of the tubes.
A pair of 807W/5933 is rated 120W input ICAS on AM. Don't expect much more than 85W output. In 1957 a novice may have had to pull out a tube (75W input limit) but not any more (200W output limit).
BTW, are you going to bias the amp with a 67.5V battery as shown in the 1957 handbook?