These pots are made by Alpha, with a body 24mm in diameter. I stock the 500K and 1M log versions, which are useful for post-PI master volume controls (as shown in this Plexi-style PPIMV modification). You can also use the these pots to simultaneously adjust gain in two parts of an amp circuit. These pots differ slightly from the single Alpha pots: they fit an 8mm panel-mounting hole and they have a shorter metal shaft.
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The two pots are controlled by a single shaft - perfect for a post-phase-inverter master volume (PPIMV)
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