Here we have a rare vintage Apt Corporation Power Amplifier 1 in very good cosmetic condition. There are some scuffs and scratches on the top of the unit, with a 1" round imprint on the front center of it as well. The faceplate has some nicks on the top edge, but overall the amp presents itself very well. The Amp was cleaned and fully tested on our bench and it performed up to spec. We obtained two of these amps from the original owner who had them bridged mono driving his NHT speakers in his A/V setup. We don't have the original box but the amp will be packed properly using a heavy duty box with polystyrene and or Instapak.
The Apt 1 Amplifier is a power amplifier for driving loudspeakers in a wide range of home music systems.
It provides a flexible complement to the Apt/Holman pre amplifier, but it is meant to allow an optimum match, without detrimental interactions, to any other possible system components.
The chosen design supplies the maximum useful power presently attainable without concessions in reliability or cost-effectiveness. It features novel approaches to protection circuitry and power supply design, as well as DC and AC stability.
It incorporates psycho acoustically optimized output monitoring indicators, switching for both bridging (monaural) operation and loudspeaker impedance matching. A power transformer with low external flux minimizes the amplifier's radiated hum field.
The flat, U-I lamination transformer has also allowed a convenient mechanical design, with a horizontal component layout making all parts accessible at the same time. Most servicing points can be reached by removing just the top cover and the two amplifier heat-sink modules.
Power output: 100 watts per channel into 8â„¦ (stereo)
Frequency response: 1Hz to 30kHz
Total harmonic distortion: 0.03%
Damping factor: 200
Input sensitivity: 0.925V
Signal to noise ratio: 80dB
Speaker load impedance: 4â„¦ to 16â„¦
Dimensions: 87 x 429 x 265mm