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The following modification allows the 122 amp to use either 6550s or EL34s. The modification is relatively simple, requiring a rewiring of the Leslie output tube sockets, the addition of a 100 ohm / 5 Watt resistor, and a switch. Any tech should be able to do it in an hour or so. The usual caveats and disclaimers regarding this modification apply. Use at your own risk. |

