12 years wouldn't be classed as old. Marantz made top quality stuff throughout the 80s. It wasn't until the 90s came about where all stereo brands (with the exception of ultra high-end equipment) started using IC (micro-chip integrated circuits). The result was once these IC chips would fail, it would render the whole unit useless as most of these IC chips are proprietary (after 5 years or so, the chips are no longer available).
The term "discrete componetry" is a thing of the past as more and more ICs are being used (thus lowering the cost of production). When I say discrete, we mean the use of only electronic components 'resistors, capacitors, & transistors'.