Why are tube amplifiers relatively expensive?
A. First, large, complex power transformers supplying multiple low and high voltages at fairly high currents are required for the power consumption requirements of the tubes. The transformer must also have a low electrical radiation field and low current leakage for low mechanical noise. Transformers with low radiation and current leakage are fairly difficult to build. Second, the output transformers which provide electrical impedance and power matching between the output tube(s) and the speaker is a complex device requiring hand winding and assembly if flat, extended frequency response and maximum power transfer is to be achieved. This transformer is a small work of art in its execution. Third, the chassis must be rigid and strong to support 25+ pounds of transformers and to provide minimal mechanical vibration transfer from the power transformer to the tubes. Preferably it should be made of aluminum for low electrical and magnetic noise transfer, lighter weight and optimal finishing
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