[RodB]

Hey True, those are selenium rectifiers in the power supply circuit. You will want to replace them with a silicon diode in series with a 47 ohm resistor. The one with the resistor may have already been replaced by someone before you. Some people just use the terminals of the old one to support the new silicon diode. I usually replace the rectifier with a terminal strip then mount the silicon diode on the strip. The reason for the resistor is to drop the voltage back to the desired level. Selenium rectifiers have a higher internal resistance than a silicon diode. You may have to experiment with the resistor value. BTW be very wary of burning up the selenium rectifier, it will fill the room with a terrible odor.

Rod