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One step at a time.

You need to find out what stage is causing the hum.
Is this the point-to-point wiring or PC board type Ella?
In any case you should follow a method. You need to find out what stage is causing the hum.

1. Isolate the drive to the power stage.
.....disconnect the drive. IIRC you can lift the coupling caps from the amp/driver board. Still have hum? It's in the power stage. Tubes, bias, B+, system ground, something. No hum? go to step 2.

2. Reconnect the coupling caps. Verify that the hum is still present. Disconnect the signal input to the board and short those two inputs. (If this is point-to-point, then disconnect the signal input wires at the input tube.) Still hums? It's in the amp section or power/ground to the board/amp section. No hum? go to step 3.

3. Bypass the volume control. Connect the inputs directly to the input.

Could be a bad tube, solder connection, mechanical connection to chassis, etc. etc.

That's just a rough outline. In no way is it complete, but I hope it gives you some idea as to how to go about finding the problem.

Keep at it. Ella sounds great and should be just fine on your speakers.

Take care.

Pete.

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