Found some micro cermet volume controllers for DIY people. 4 for $6.
Ive been doing a lot of trial an error with volume controllers. I found that the 500 OHM pots that you would use for a guitar burn up quickly and cause problems. On one machine, it works well, and another it does not. For my Popeye pachinko machine, I needed the micro ones, versus the large guitar pots. A seller has them on ebay, but I just couldnt justify the $18 for 6 of them, knowing they where just simply trimmers. I found this listing on ebay, gave them a shot and they work great. Much better than the guitar pots!
Here is the listing:
500 Ohm Cermet Trimmer Pot 1 Turn Tocos New Qty 4pcs | eBay
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They are very small, and the pins are somewhat fragile. When its soldered correctly with heatshrink and seated well in the machine, I had no problems adjusting the volume without damaging them. You probably can find them cheaper in bulk, but for $6 for 4 of them I was happy. A warning though, you have to be decent at soldering because they are very small! Using cheapie irons wont cut it unless you have a thin tip. You will need flux as well
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