SONY WM-W800 (1985) | Double Cassette Walkman

 

The Sony WM-W800 Walkman is one of the most distinctive portable cassette players ever produced during the golden age of personal audio. Introduced by Sony in 1985, the WM-W800 stands out for its unique dual-cassette design, allowing users to carry and play two tapes simultaneously in a single compact device. Visually, the WM-W800 reflects the bold industrial design language that defined Sony’s premium Walkman lineup. Its symmetrical twin cassette doors, solid construction, and distinctive styling give the player a futuristic look. Unlike standard cassette players of the period, the WM-W800 emphasizes convenience and novelty while maintaining the high engineering standards associated with classic Sony portable audio equipment. From a technical perspective, the WM-W800 delivers the clear, dynamic cassette playback quality expected from late-generation Walkman models. The transport mechanism is carefully engineered for stable tape handling, helping preserve sound quality while minimizing wow and flutter during portable use. While the WM-W800 was constructed fairly simply (by mounting two WM-10 type mechanisms back to back) it also offered tape to tape copy...on the go if you wish... As well as being able to copy tapes, the WM-W800 could also make “live” recording using the miniature stereo microphone capsule that was included with each machine. The microphone socket included a “plug in power” connection for amplified type microphones...then there was also a FM tuner module that can be inserted in the cassette compartiment for FM Stereo radio broadcasts. Specifications: Frequency response 40-15.000Hz (Metal tape) | Size 116x88,7x38,2mm | Wight 360g

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PIONEER mini HI-FI 3000 (1979)

 

The Pioneer Mini Hi-Fi 3000 System was introduced in 1979 and it was presented as "a new standard for high fidelity". Not just the dimensions that are noteworthy. Two other important aspects deserve to be highlighted: ease of use and sound quality. Unlike even smaller and more expensive mini or micro systems, Pioneer presented a system that met high musical demands. For example, the Pioneer Mini Hi-Fi System includes an integrated turntable (still the primary program source). All other components are grouped around the turntable – matching in style and technology. The heart of this mini system is a flat, perfectly constructed stereo amplifier. The power amplifier section is DC-coupled and has an OCL output to improve transient response. The power supply contains an expensive, oversized core transformer and four electrolytic capacitors. The TX-3000 tuner (FM/AM) incorporates a triple rotary capacitor. Its sensitivity is 16.2 dBf. The PL-3000 fully automatic turntable has two motors: a brushless DC Hall servo motor for direct drive of the platter and a second for full automation. The coaxial damping system, as in the more expensive models, dampens resonances. The Dolby cassette deck features a cassette drawer. This design detail was necessary to maintain the flat design, while keeping the cassette in view at all times. Another special feature not found on every cassette machine is a dedicated display for monitoring how much tape has been used and how much time remains for recording or playback. Finally, the mini components include a specially designed speaker box: the compact 2-way CS-X2 model, perfectly matched to the mini system; the maximum power handling is 50 watts. Pioneer also offered a specially designed audio rack (B-3000) for the components of the mini hi-fi system. It consists of two parts, each measuring 38×40×35 cm. These two parts can be stacked or placed side by side. If you need suitable speakers for the mini system: Pioneer offers various systems. You can choose between the HPM-30, the CS-X3 (the smallest Pioneer speaker), and the CS-X2. Specifications:

SA-3000 INTEGRATED STEREO AMPLIFIER

40W + 40W (8 ohms, 20-20,000Hz, 0.02% THD), Dimensions: 380 (W) × 83 (H) x 295 (D) mm, Weight: 7.6 kg

TX-3000 FM/AM STEREO TUNER

FM usable sensitivity: Mono; 10.3 dBf (1.8 µV) (IHF), 0.7 µV (26 dB signal-to-noise ratio, 75 ohms) (DIN), Stereo; 20 µV (46 dB signal-to-noise ratio, 75 ohms) (DIN) Dimensions: 380 (W) × 83 (H) × 335 (D) mm, Weight: 4 kg 

PL-3000 FULLY AUTOMATIC DIRECT-DRIVE TURNTABLE

Wow and flutter: 0.03% (RMS, rated), ±0.042% (DIN), Rumble Signal-to-Noise Ratio: 75dB (DIN B) Dimensions: 384 (W) x 145 (H) x 360 (D) mm, Weight: 7.9 kg

CT-3000M Stereo Cassette Deck with Metal Tape Compatibility and Dolby* Noise Reduction, Wow and flutter: 0.05% (RMS, rated), ±0.17% (DIN) Frequency range: 20-19,000 Hz (Metal) Dimensions: 382 (W) × 83 (H) × 329 (D) mm, Weight: 6.4 kg 

CS-X2 TWO-WAY LOUDSPEAKER

Transducers: 16 cm cone woofer, 2.5 cm soft dome tweeter, Frequency response: 60-20,000 Hz Dimensions: 220 (W) × 380 (H) × 205 (D) mm, Weight: 6.5 kg (14 lb. 5 oz.)

B-3000 AUDIO RACK (Optional accessory)

Dimensions: 380 (W) × 401 (H) × 350 (D) mm, Weight: 13 kg (weighed with two parts together)

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HITACHI HA-8700 (1979) | Power Mos-Fet

 

The Hitachi HA-8700 MOS-FET pre-main amplifier is a classic example of late-1970s Japanese high-end vintage hi-fi engineering. Designed using technology derived from the Hitachi HMA-9500, this DC-coupled MOS-FET amplifier combines wide-bandwidth power amplification, advanced phono equalizer circuitry, and dual-mono power supply design—features that made it a standout vintage audiophile amplifier. Designed for demanding audiophile systems, the amplifier combines high-speed MOSFET power devices, a fully DC-coupled signal path, and dual-mono power supply architecture to deliver accurate, transparent sound reproduction across the entire audible spectrum. At the heart of the amplifier is a newly developed Power MOSFET power amplifier stage. Compared with conventional bipolar transistor amplifiers, MOSFET devices provide significantly faster switching performance and wider frequency response. Key performance characteristics include: Ultra-fast switching speed: 0.05 µs | Wide frequency bandwidth: 1 MHz (-2 dB) | High power gain: 85 dB at 100 kHz. This extremely wide bandwidth enables stable negative feedback at very high frequencies, reducing distortion and improving overall amplifier linearity. The fast switching capability also ensures stable push-pull operation even in Class-B output configurations, resulting in excellent transient response and accurate musical reproduction. To fully exploit the performance advantages of MOSFET output devices, the amplifier employs a three-stage power amplifier topology with minimal phase shift. This advanced circuit design ensures stable operation across the entire frequency range while preserving signal integrity and transient accuracy. Low-frequency performance is further enhanced through: DC amplifier power supply architecture | Independent left and right power supplies | Large-capacity high-grade capacitors. This design provides excellent dynamic headroom, bass control, and channel separation, essential for high-fidelity audio reproduction. The main amplifier gain has been increased from 29 dB to 45 dB, allowing the amplifier to deliver higher output capability and improved dynamic performance. A dedicated Main Direct switch allows the power amplifier stage to be connected directly to the equalizer amplifier output, bypassing intermediate circuitry. This shorter signal path reduces signal loss and improves clarity, transparency, and detail retrieval. When the Main Direct function is disabled, the amplifier operates with reduced gain to ensure optimal compatibility with external sources. The entire signal chain—comprising the head amplifier, phono equalizer amplifier, preamplifier, and main power amplifier—uses a complete DC amplifier configuration. By eliminating coupling capacitors both at the input stages and within the negative feedback (NFB) loops, the design achieves: Improved phase accuracy | Faster transient response | Extended low-frequency performance | Greater midrange transparency and high-frequency clarity. This fully DC-coupled amplifier topology is a hallmark of advanced vintage audiophile designs and contributes significantly to the amplifier’s natural and precise sound reproduction.

The amplifier features a high-stability dual-mono power supply, using separate left and right power transformers and large-capacity filter capacitors. This architecture significantly improves channel separation, dynamic stability, and power delivery. To further prevent interference between circuits, dedicated regulated power supplies are used for the tone amplifier and head amplifier stages, isolating small-signal amplification from the main power section. Both Speaker Output A and B terminals use direct output connections, allowing the signal to reach the speaker terminals without passing through the speaker selector switch. This design reduces contact resistance and preserves signal purity and damping performance. The power supply and main amplifier sections are built on a 70-micron copper PCB, twice the thickness of standard circuit boards. This heavy-duty board design reduces impedance between the power supply rails and the output stage, improving current delivery, amplifier stability, and overall audio performance. Specifications: 90W + 90W (8ohm, both channel driven) | THD: 0,002% (8ohm 1kHz) | Frequency characteristic DC-100kHz | Damping factor 80 (1kHz 8ohm) | Dimensions (W/H/D) 435x165x420 mm | Weight 20kg | Original sale price in Germany: 1648 DM

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