I am a fan of portable gadgets, however, I used decks for listening to cassettes in the past. Nowadays I only use walkmans for listening to the cassettes. Primarily I like Sony walkmans for their excellent sound quality. I am especially a fan of later Sony models, released primarily from 1995 to 2005. They are mainly built on plastic parts and most hated among serious walkman lovers. But I like them, because they are simple machines. Transports are very simple, straightforward, having very fewer parts that are arranged in a non-complicated way. Availability of belts for these transports is also easy. In general, these transports feature the "Anti-Rolling Mechanism", which mean that they are very less prone to speed variation during the movement of the walkman. I even run with a walkman in my pocket, the speed does not vary.
My present everyday walkman model for cassette listening is the Sony WM-EX182 from 1998. It is an identical machine to its sibling WM-EX172. The EX182 is a blue-coloured model and the colour is the only difference with EX172. EX182/172 features Dolby-B NR, Mega Bass Boost, Bass-Treble Control, Tape Type selector (Normal/Chrome/Metal) and Auto Volume Limiting System (AVLS). It does not possess Auto-Reverse and Radio. The electronics are made up of only three ICs. A SOC-like audio chip, Sanyo LA4582CM, handles all the functions of Pre-Amp, Tone-Control, Mega Bass and Amp. According to its datasheet, it can deliver up to 375 mW of power using a 16-ohm load with 0.04% THD (during Mega Bass ON). The other chip is the Dolby-B decoder, Japan Radio Corporation's (JRC) NJM2185A. Both the chips are the latest models of their respective semiconductor series (LA45xx & NJM2xxx) that Sony ever used in any of their consumer-grade walkmans, as per my knowledge (any input is welcome though in this regard). However, this kind of all-in-one IC design may attract the point of discussion, because many users might favour discrete IC design.
The third IC is Sanyo LB1979, which is the Motor-Driver. It runs a three-coil Disk Motor that provides a super smooth tape speed.
Here is a photo of the little guy...
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