Sony TA-A1ES Manual

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Main features of the amplifier
This power amplifier achieves dynamic output by using a single push-
pull amplifier.
The power amplifying stage, which determines sound quality, consists 
of a single pair of transistors, successfully eliminating the emitter 
resistance used by conventional amplifiers to suppress overheating. 
The transistor output drives the speaker directly, reproducing sound 
with less undesired character.
A frame beam base chassis has been developed for the stereo 
amplifier.
By combining a conventional frame beam chassis with a transformer 
base, providing high accuracy and stiffness, the frame is more 
stabilized, reproducing better sound with less overall distortion.
This amplifier employs a relay for signal switching to eliminate sound 
loss, and discrete circuits for entire stages to optimize and upgrade 
the circuits.
The terminals of this amplifier minimize sound quality deterioration. 
Y-lugs and speaker wires can be tied securely. You can connect 
banana plugs, too. The terminals can be used for bi-wiring 
connection, also, using both types of plugs mentioned above.
This amplifier has a discrete amplifier used exclusively to drive 
headphones. The impedance can be switched among LOW, MID, or HI 
to match that of the headphones.
Power amplifier utilizing single push-pull output
Frame beam base chassis (FBB chassis)
A preamplifier constructed of completely discrete 
stages
Newly-designed large speaker terminals
Discrete amplifier for exclusive use with 
headphones