Itsa damp design...
This circuit is based on the TDA7350A by ST, which is a robust car radio amplifier. It supports 22 watts of bridged output, which is then sent through a 50'+ underwater umbilical, into a dive mask. The line matching transformer is actually milspec; it was the only one which fit the bill! The current version is hand wire-wrapped and placed within a NEMA box. But though sealed and packed with desiccant, everything electronic is mortal in a saltwater environment. With PCB's in stock, we'll be able to quickly produce new units. This first revision is a bit spacious, the next one will likely have two units in the same panel space. The panel pins will also be better utilized i.e. for the pot header.
This is what happened to the original board:
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