Penta Laboratories Amplifier Replacement Parts

3-500ZG Pair Matched Vacuum Tubes, High-Mu Power Triode, 500W, Ceramic Base, Set of 2

Part Number: PLB-3-500ZG-2

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572B Four Matched Vacuum Tubes, Power Triode, Direct replacement for the 811A, Set of 4

Part Number: PLB-572B-4

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