SONY TA 8650 (1973) | V-Fet Power

 

Does it pay to buy an amplifier this good?...was asking Sony in 1973. Sony research took the art of amplification a giant step forward... First, Sony developed an entirely new, high-power transistor, the Vertical FET (V-FET). Unlike any conventional bipolar transistor or the regular FET used in FM tuners, this semi-conductor has all the characteristics of the classic triode vacuum tube, assuring a high current utilization ratio and uniform thermal flow for exceptionally stable operation under varying conditions. 

Second, Sony used its new V-FET technology to build an amplifier which meets exceptional needs: great power delivered with the smooth "open" sound, long thought the exclusive attribute of vacuum tubes. At the same time all the proven benefits of advanced solid state, particularly high stability and reliability have been retained. Result: The Sony TA 8650, a truly magnificent integrated amplifier which gives 80+80 watts of musical sound so "real" it lives. The fidelity is unsurpassed with distortion levels so low they're nearly unmeasurable! Pre-amp: 0.03% THD at rated output; Power amplifier: 0.05% or less @ 1kHz, @ 1W: 0.1% or less, 20Hz-20kHz @ rated output, Frequency response curves for high level inputs are ruler flat (+0,-2dB) from 10Hz to 100kHz. Phono equalization is also unusually impressive, corresponding to the RIAA curve 0.2dB. Yet these ultra specifications alone can't indicate the unit's unexcelled performance under musical conditions, with transient and phase response never attained in normal solid state construction. 

Now, great power and superb, natural fidelity come in a package along with literally dozens of application and facility features, typical of Sony design ingenuity. To list a few: high quality professional LED clipping level indicator to show overload, complete FET protection circuits which prevent circuitry or speaker damage, complex professional controls designed for utmost accuracy and precision, including instant 20dB muting volume control, and level control memory. Tape monitor and dubbing facilities are thoroughly professional and very comprehensive, as are the rear panel connection facilities.

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