70V Line Speaker Wiring: Difference between revisions

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An amplifier with various taps on its output terminals that includes a 70V along with 8 Ohm or other low impedance taps generally has a built-in step up transformer. A low impedance amplifier can also be supplied with an external transformer.

Before solid state amplifiers became available in the 1950s, all amplifiers had output transformers. There is no other safe or practical way to remove the dangerously high plate voltages used on output tubes from the speaker line. The variations in the quality of the output transformer was responsible for the differences of fidelity and prices charged for tube amplifiers.

Before solid state amplifiers became available in the 1950s, all amplifiers had output transformers. There is no other safe or practical way to remove the dangerously high plate voltages used on output tubes from the speaker line. The variations in the quality of the output transformer was (and still is) responsible for the differences of fidelity and prices charged for tube amplifiers.

Modern high voltage MOSFET amplifiers are now available capable of driving 70V lines with previously unattainable low distortion that can drive 70V drivers without the use of step up transformers and their attendant distortion.

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 An amplifier with various taps on its output terminals that includes a 70V along with 8 Ohm or other low impedance taps generally has a built-in step up transformer. A low impedance amplifier can also be supplied with an external transformer.
-Before solid state amplifiers became available in the 1950s, all amplifiers had output transformers. There is no other safe or practical way to remove the dangerously high plate voltages used on output tubes from the speaker line. The variations in the quality of the output transformer was responsible for the differences of fidelity and prices charged for tube amplifiers.
+Before solid state amplifiers became available in the 1950s, all amplifiers had output transformers. There is no other safe or practical way to remove the dangerously high plate voltages used on output tubes from the speaker line. The variations in the quality of the output transformer was (and still is) responsible for the differences of fidelity and prices charged for tube amplifiers.
 Modern high voltage MOSFET amplifiers are now available capable of driving 70V lines with previously unattainable low distortion that can drive 70V drivers without the use of step up transformers and their attendant distortion.