Pioneer SPEC 1 - SPEC 2 High-End

Description

The Spec-1 has differential amplifier circuitry incorporated in the equalisation and tone control amplifiers.

This is complemented by a dual positive and negative power supply system for all amplifier sections, which provides improved DC balance and stability, while eliminating click noises due to switching.

An electronic muting circuit, employing a reed relay, blocks surge noise associated with power switch operation.

Specifications

Frequency response: 10Hz to 70kHz

Total harmonic distortion: 0.03%

Input sensitivity: 2.5mV (mic), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 70dB (MM), 90dB (line)

Output: 150mV (line), 2V (Pre out)

Semiconductors: 50 x transistors, 33 x diodes

Dimensions: 480 x 186.5 x 365mm

Weight: 11.2kg

Accessories: connecting cord, hex wrench

Year: 1976

Description

The Spec-2 is a 250W rack mount stereo power amplifier featuring a current limiter circuit, peak level meters, protection circuit, power switch on/off and impedance selector muting and a temperature detector.

This high power design employs a cascaded differential amplifier first stage, push-pull drive, and darlington triple push-pull circuit with all stages direct coupled (OCL).

Specifications

Power output: 250 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 80kHz

Total harmonic distortion: 0.1%

Damping factor: 50

Input sensitivity: 2V

Signal to noise ratio: 110dB

Speaker load impedance: 4Ω to 8Ω

Semiconductors: 55 x transistors, 75 x diodes

Dimensions: 480 x 186.5 x 445mm

Weight: 24.3kg

Year: 1976