Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

Originally Posted by Chris K

When the instructions say "shunt the primaries" I just assumed there were secondaries

Funny. I went back and looked at the instructions and it calls the units transformers and calls the coils "prim." implying primary. Semantics.

The main issue is the coils are stagger tuned to cumulatively provide the wide bandwidth required. The shunting of the coils with the 330 ohm resistors is to effectively remove each tuned IF stage so that the response will be governed only by the tuner to 1st IF over coupled transformer link.

[Chris K]

Originally Posted by Penthode

Funny. I went back and looked at the instructions and it calls the units transformers and calls the coils "prim." implying primary. Semantics.

The main issue is the coils are stagger tuned to cumulatively provide the wide bandwidth required. The shunting of the coils with the 330 ohm resistors is to effectively remove each tuned IF stage so that the response will be governed only by the tuner to 1st IF over coupled transformer link.

In the schematic, what do the twin up and twin down arrow designations next to the coils mean?

[Yamamaya42]

Originally Posted by Chris K

In the schematic, what do the twin up and twin down arrow designations next to the coils mean?

I assume that's to denote an adjustable core type coil on the schematic.