11-17-2010, 06:49 PM
Hi Matt,
Sounding like the speaker as been replaced with a permanent magnet type. The 680 ohm resistor must be standing in for the open field coil of the original speaker. The field coil is part of the power supply and the electromagnet of the old speaker. That resistor will carry the B+ current and dissipate about 5 watts and will burn your finger. You need to consider recapping the entire radio which is a major job. A cap failure likely burned out the field coil.
Richard
Sounding like the speaker as been replaced with a permanent magnet type. The 680 ohm resistor must be standing in for the open field coil of the original speaker. The field coil is part of the power supply and the electromagnet of the old speaker. That resistor will carry the B+ current and dissipate about 5 watts and will burn your finger. You need to consider recapping the entire radio which is a major job. A cap failure likely burned out the field coil.
Richard
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