02-15-2008, 09:53 PM
I want to replace the jury rigged permenant speaker on my model 118 with one that is more authentic. The schematic shows the filed coil with a resistance of 1,140 ohms and the secondary on the audio transformer of 1.1 ohmn. It does not show the resistance for the primary on the audio transformer. What is the appropriate resistance for the primary? and How close do I need to be on rersistances for the primary and the field coil? For example is a 1500 ohm coil close enoough to 1140 or will it cause the plate voltages on the tubes in the set to run too low. Thanks