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  • Technical characteristics
    • Type: Stereo Integrated Valve Amplifier
    • Output Stage: push-pull ultraliner
    • Classe: AB
    • Output Power: 40W
    • Output Impedance: 6 ohm
    • Inputs: 4 line
    • Outputs: 1 tape, 1 sub woofer, loudspeakers
    • Feedback factor: 14dB
    • Frequency Response: 20 – 30000 Hz
    • Valves: 4 x EL34, 2 x ECC82, 1 x ECC83
    • Remote Control: IR for volume
    • Power Consumption: 300W max
    • Dimension: 16.5 x 15.7 x 8.3 inch.
    • Net Weight: 55lbs
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An amplifier with a push-pull circuit consists of a stage with two power tubes–each of which amplifies one half-wave, either positive or negative, of the audio signal.
The special design of the output transformer in the P-40 then enables the correct reconstruction of the amplified signal at the output terminals. The advantage of the push-pull system lies in its ability to produce greater output power than is obtainable from a single-ended design using the same type of valve. This advantage is determined by the greater efficiency of the push-pull system, which translates to lower heat dissipation for any given output power.
The disadvantage of push-pull stages is that since they rely on the amplification of two separate half-wave signals by two separate amplifying devices, they must be particularly well-engineered in order not to encounter significant distortion. The P-40 boasts an impressive specification: 40 watts into a 6 ohm load with full-bandwidth distortion less than 0.2%. This performance is similar to that of a well-engineered amplifier using a single-ended topology.

Note: The glass of P40 and P70 is made in one piece, and not all colors are always available.