Question about Galaxy Radios DX 77HML Base CB Radio

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Tr51 gets hot

Tr51 gets hot

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This is part of a Darlington Amplifier section of voltage regulation to the Final transistor it may be getting hot for various reasons one you may be taxing its resources by long key downs or you may have too much voltage going into the radio it should only be supplied with 13.8 Volts Maximum more than that (Volting the Radio) Will over work thhis transistor and eventually burn it out.

Posted on Sep 12, 2010

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Posted on Jan 02, 2017

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Do you have a "swing kit" or a "swing diode" installed?
This could also be called an NPC ("Negative Peak Clipping") Modification. There should be a 1/2 watt 100 ohm resistor attached on the unbanded end of the diode. If it is a "Kit", It will not have a 100 ohm resistor and can cause TR51 to overheat during long transmissions.
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