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Pioneer Spec-1

Rack Mount Stereo Pre-Amplifier (1976-80)

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Pioneer Spec-1


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.


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


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Reviewed Jul 07th, 2018 by 4really

I just purchased the Spec 1 to match a Spec 4 I own. These units are very robust. Shipper did a lousy job packing but the unit arrived undamaged due to rack handles and rear bumpers. First impression is great. Detailed sound with a TON of power with the Spec 4. I own McIntosh, Yamaha, Heathkit, and Setton equipment. This system ranks at or near the top~



re: Spec-1

I just picked one of these up. It's in great shape except the toggle switch caps are missing. Has anyone found a reasonably priced after market solution. So far all I've found are 1 off used parts on auction sites. I need all eight and would like them to match. Any help would be appreciated.

This website is not affiliated with or sponsored by Pioneer. To purchase Spec-1 spares or accessories, please contact the company via their website or visit an authorised retailer.