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You did an excellent job on that! Those boards are sucky to clean. The dark spots on the bottom of the board is "tube scorch" Be really careful when removing or installing tubes in those sockets as the board can crack. It's best to squirt a small amount of deoxit under the tube to loosen it up if it's tight in a socket on a burned board. The tube wiggles right out with no stress on the brittle parts. You have a great set, I look forward to seeing it work.
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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