Miller & Kreisel VX-7B Subwoofer Service

This old M&K VX-7 subwoofer from 1993 has a simple problem, which was easy to fix. I also found a schematic for it after the fact, and it uses a Sanyo STK4040V mono power amplifier IC module. This puts its average power output at around 50-60W.
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[@nettneo]

This is an Amazing little sub. I have 2 of them. One stopped working just before covid and took it to a repair shop. This guy lost it or sold it. He asked for proof, so I showed him a photo I took of the serial number of the sub......sitting on the floor of HIS shop. A week later i gave him the original Box with the same serial number. He then gave me $450 for it.

[@AstrosElectronicsLab]

LOL! Epic, dude! There are some shifty people out there, and the most likely issue originally with it was the Sanyo STK4040V IC (I'm assuming), and good luck to him to find a genuine one. And, yes. I've been using the sub now for 4 days, and with a little fiddling of the crossover and gain pots, I think I've got the perfect amount of bass to compliment my Accusound speakers.

[@AstrosElectronicsLab]

Also, thanks for commenting and watching!