I'm working on a 1939 Beam of Light Philharmonic Deluxe and noticed a wiring error (ok, maybe)...in looking at the schematics available, it gets worse. Refer to the 3 images attached as needed. Here we go:

In the 1937 schematic, and in most sets I've worked on, pin 8 (cathode) and pin 5 (grid #3, usually tied to the cathode) go directly to ground. Pin 5 (at ground) is used as a tie point for the "pass through" caps in the IF cans. In the 1939 schematic, it looks like Scott added a cathode bypass (400ohm/.05mfd) - BUT - the schematic still shows everything grounded (look closely at the diagram, the R/C network does nothing as drawn).

Now the puzzler - the set I'm working on is wired like the 1939 schematic, but "correctly", the cathode and pin 5 are sitting on the R/C network, NOT at ground. HOWEVER - the two very original caps passing through the IF are connected to pin 5 - therefore NOT at ground potential.

Now I'm sure the primary IF bypass (goes to B+) should be coming back to ground. And pretty sure the secondary one should too. I have two options: remove the R/C network and just ground things like the 1937 schematic, or move the pass through caps over to a ground tie point. I"m leaning toward the latter solution. Would love thoughts on this from the techs in the group!!

Kent