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The Original 30 watt Hoffman head layout diagrams. |
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| 2 x 6V6 model Notice that the heaters were run on DC on early models. That was dropped later on and the heaters were run conventionally on 6.3 volts ac. |
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| 2 x EL84 version |
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| 2 x 5881 - AC heaters and hot switch mod Same as 2 x 6V6 with AC heaters |
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