THE FISHER 30-WATT AUDIO AMPLIFIER
THE FISHER AUDIO AMPLIFIER, Model 80-AZ, is our great new 30-watt amplifier with PowerScope, a Peak Power Indicator calibrated in watts to show instantly the peak load on your speaker system. The model 80-AZ will meet the requirements of the most exacting user. Complete fidelity of reproduction and absence of listener fatigue are a direct result of the extremely low harmonic and intermodulation distortion at all power levels, as well as excellent transient response, wide frequency range, and good linearity. Hum and noise are virtually non-measurable, thus allowing operation at all listening levels without the distraction of extraneous noise. The great reserve power handling capacity of the model 80-AZ makes it capable of reproducing the complete dynamic range of a full symphony orchestra! All components in this compact unit have been selected for long life, and installed with maximum accessibility in mind, for easy servicing.
The Model 80-AZ has three separate feedback loops, resulting in low internal impedance, extremely low distortion and excellent transient response. Two type EL-37 tubes, connected as tetrodes, are employed in the power stage. The unique cathode feedback circuit offers all the advantages of triode performance, together with the efficiency of tetrodes. The carefully designed output transformer consists of fifteen interleaved windings, in conjunction with a grain oriented steel core.
THE FISHER Model 80-AZ may be used directly with a tuner, such as THE FISHER Models 80-T, 80-R, or FM-40, a crystal phonograph cartridge or any other device capable of producing a one-volt signal. Where magnetic phonograph cartridges, microphones, or similar low-level devices are employed, pre-amplification is necessary. Especially suited to these latter applications is THE FISHER MASTER AUDIO CONTROL, Series 80-C, and THE FISHER Audio Control, Model 50-PRC.
