A Straightforward Amplifier with Vinyl Flexibility
The A-400 developed a strong following for its relatively simple, performance-led approach. Rated at 50 watts per channel into 8 ohms, it has sufficient power for many domestic systems, while Pioneer also specified a DIN output of 85 watts per channel into 4 ohms.
Its switchable phono stage is particularly useful for vinyl listeners, accepting both moving-magnet and lower-output moving-coil cartridges. The MM and MC settings on this example have both been checked and tested.
Additional inputs accommodate a CD player, tuner and line-level source, together with two tape loops for playback and recording. No remote control is supplied, so operation is carried out using the amplifier’s front-panel controls.
Technical Specifications
Sources: Pioneer A-400 operating instructions and HiFi Engine.
- Type: Stereo integrated amplifier.
- Continuous power output: 50W per channel into 8 ohms, with both channels driven.
- DIN output: 85W per channel into 4 ohms.
- Frequency response: 5Hz–100kHz.
- Total harmonic distortion: 0.03%.
- Phono stage: Switchable moving-magnet and moving-coil inputs.
- Input sensitivity: 2.5mV for MM phono, 0.2mV for MC phono and 150mV for line-level inputs.
- Signal-to-noise ratio: 87dB MM, 69dB MC and 108dB line.
- Inputs: Phono, CD, tuner, line, DAT/Tape 1 and Tape 2.
- Recording connections: DAT/Tape 1 and Tape 2 recording outputs.
- Dimensions: Approximately 420 × 126 × 352mm (W × H × D).
- Weight: Approximately 8kg.
- Production period: Approximately 1990–1991.
Why Buy From Us
With over 40 years of experience in the hi-fi industry, we are well placed to assess and test equipment of this type. This amplifier has been checked in our workshop, including testing of both its MM and MC phono-stage settings.
When you buy from us you can expect:
- Inspection and testing before listing. Our assessment goes beyond a visual check.
- A three-month guarantee. This is included with the amplifier.
- Transparent descriptions. Its cosmetic markings and lack of remote control are clearly disclosed.
- Professional packaging. The amplifier will be carefully packed for dispatch.
- After-sales support by phone or email. Unlike buying from a private seller on eBay, you have an established family hi-fi dealer to contact for assistance.
Summary
A properly checked example of Pioneer’s respected A-400 integrated amplifier, with both its moving-magnet and moving-coil phono inputs tested. It is in used condition with visible cosmetic markings and is supplied without a remote control. This is a single-unit listing and includes our three-month guarantee. Please feel free to get in touch with any questions prior to purchase.
