![]() The tube manufacture specifies their recommended impedance based on the typical operating range of the tube. The vacuum tube’s impedance will vary according to the operating point of the tube therefore, there is no exact "correct" primary impedance value. Like speakers, vacuum tubes also have reactive output impedances. The power amplifier tubes transfer power most efficiently to the speakers when the primary impedance of the transformer matches the combined output tube’s impedance. The primary impedance of the output transformer is typically selected to be within "ball park" of the vacuum tube manufacturer's recommendation. The output transformer contributes to the overall tone of the amplifier. Also, the earliest Marshall 100 watt handwired amplifiers were equipped Radiospares transformers, then with Drake transformers, and finally around 1968 they were fitted with the Dagnall transformers. In general, the 1966 and onwards the Marshall 45 and 50 watt handwired amplifiers were equipped Drake transformers. In 1965, Marshall began migrating to the Drake transformers. ![]() The earlier Marshall amplifiers used the Radiospares transformers. Marshall used Radiospares, Drake and Dagnall brand transformers and chokes.
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