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Kenwood ts 520 530 820 830 6146W (2) + 12BY7 tube set
12BY7/A Driver and 6146W (2) Matched Finals using "W" which is the ruggedized military version of the "B"
6146W (2) Power Amplifiers - No Chinese (Penta, International) tubes!
The Power amplifier tubes are matched by manufacturer (tube code, not label) and current draw to ensure long life, balanced set for your radio.