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THE LARGEST TUBE AMPLIFIER PRODUCED FROM ALTEC 1950-60s.
The 260A Amplifier is a rack mounted.medium gain power amplifier designed for sound reinforcement and for industrial applications where 260 watts of continuopus power having extremely low distortion is required.
It is well suited for shake-table operation and motor-running service at any frequency from 50 to 15,000 cps.
The amplifier consists of two stages of push-pull amplification,the output stage being a pair of 813 tubes operating in Class AB.
Negative feedback is carried around all stages from a tertiary winding on the extra-heavy duty output transformer.
This allows the output to operate above ground if such a condition is required.
The output taps accommodate loads of 9 ohms,19ohms (70-volt line) and 65 (130-volt line) ohms.
Gas-filled rectifiers (3B28) and choke filters provides hashfree and well regulated high voltage to the 813 tubes.
All high voltage capacitors are oil-filled units.
The 260A Amplifier is completely stable under all output load conditions, with no tendency toward oscillation whether the output is open-circuited or connected to any combination of resistive, capacitive or inductive load.
Gain:50 db; 30 db, bridging 600 ohm line
Input Sensitivity: 1.2 volts rms/600 ohms
Power output: 260 watts @ less than 2% thd, 45 to 15,000 cps
Frequency Response: 10 watts outout: 0.5 db, 20-20,000 cps / 3.0 db, 5-70,000 cps
Source Impedance: 500/600 ohms and 5,000 ohms bridging
Load Impedance: 9,19(70 v line), 65(130 v line) ohms.
Output Impedance: less than 12% of nominal load impedance.
Noise Level: -16 dbm, 70 db below rated output.
Controls: Meter switch-plate current balance.
Power Supply: 105/117/125 volts, 60 cycles, 740 watts.
Tubes: 2-6AU6, 2-813, 2-3B28,1-5R4 GYA
Dimensions: 17.5"(H) x 19"(W) x 14.25"(D)
Weight: 186 pounds.
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