01-24-2024, 06:54 PM
I have two 650 chassis on my bench. Part number for the shadow meters is the same as yours. One SM lamp is fairly new with AML 40 stamped in the base. The other is old, crusty and burned-out. Can't read the print on the base. Both look like the photo below.
[attachment=29782
The lamp is connected to the 6.3 volt PT secondary.
[attachment=29782
The lamp is connected to the 6.3 volt PT secondary.