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A carbon type is used. Never a wirewound. A variable is used with a resistor in series and a resistor shunted to ground. While cheap it works well as long as proper wattage rating is used otherwise it heats up and you can watch the carrier drift as components heat up.

[QUOTE="Crusher, post: 390861, member: 3746"] A carbon type is used. Never a wirewound. A variable is used with a resistor in series and a resistor shunted to ground. While cheap it works well as long as proper wattage rating is used otherwise it heats up and you can watch the carrier drift as components heat up. [/QUOTE]

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