I get it! Texas Star intentionally manufactured amps with inadequate power cables.My thoughts.
The power wires are too small, my now very old 500 has 8 gauge directly to each board.
The factory fuse holders have been by passed and removed because they will fail under hard use.
I ran the positive directly to the second battery with my fuse at the battery and the ground goes to the frame.
Original Toshiba 2979 transistors are now $200 each from ICA and RF parts sells used 2879's that have been tested for $129
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JeffView attachment 71551View attachment 71552