Repairs have begun on my 300A. There is no easy way to access the circuit traces on the high or low voltage boards other than to remove them from the chassis and no easy way to remove one board at a time. Talk about cramming 5 lbs of s#^t in a 2 lb sack......
Since the trouble began with a pinched 12vac feed to the low voltage board, that is where I chose to start.
Below is a picture of the low voltage board after removal from the chassis.
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I removed all components and wiring, cleaned up the crusty flux and installed all new components on the board including new wiring.
Below are pictures of both sides of the board after overhaul.
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The small wires in the picture above were the original wires. I believe they are 22ga. I replaced them with 16ga with Teflon insulation. I am hopeful that replacement of the old RG-58 foam coax with RG-313 will make enough room for the larger wires
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Stay tuned.
73’s
David
