The product is a Marantz tube preamplifier with a 1 Meg linear balance control potentiometer, specifically the AB A500K model by Allen Bradley. This audio taper logarithm potentiometer is compatible with a 500K dual model and is made in the United States. With a brand associated with high-quality audio equipment, this preamplifier is likely designed to provide a smooth and precise balance control for enhanced sound quality. Lot
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I have a complete whole box of these. Happy hunting I hope you find the tubes you’re looking for.