06-24-2011, 11:32 AM
Hi
Most likely, the additional electrolytics were added in an attempt to reduce hum after the speaker was converted to a PM type.
However, 150 ohms isn't enough to replace the original 1100 ohm field. You should either replace that 150 ohm coil with an 1100 ohm, 25 watt resistor; add a 1000 ohm, 25 watt resistor in series with that coil (assuming it is a filter choke), or find and install the proper original type speaker.
Replace all of the paper and electrolytic capacitors, and expect to replace the old rotten rubber insulation on the wires as well.
Most likely, the additional electrolytics were added in an attempt to reduce hum after the speaker was converted to a PM type.
However, 150 ohms isn't enough to replace the original 1100 ohm field. You should either replace that 150 ohm coil with an 1100 ohm, 25 watt resistor; add a 1000 ohm, 25 watt resistor in series with that coil (assuming it is a filter choke), or find and install the proper original type speaker.
Replace all of the paper and electrolytic capacitors, and expect to replace the old rotten rubber insulation on the wires as well.
--
Ron Ramirez
Ferdinand IN
