The first thing to do is to cut off its 3.5mm (or 1/4″ on HD-650) stereo plug. At this stage cable may be shortened to the desired length: Sennheiser cords are not of the best quality (that’s why we have so many aftermarket cables) so the shorter it is, the better.
Who would want a Discman in the age of iPhones? No one walks out of the door without a cell phone, and earbuds is all you need to have “portable” music.
Better sound quality on the Go? Hi-Rez player from Questyle, A&K, Pono, or even iPod with portable headphone amplifier usually cures this fit of audiophilia.
Some Discmans do sound better than iPods/iPhones, but all such players are the 1st and 2nd generation of Discmans and they are anything but portable.
So, who would want to invest time and money into decent Discman? Folks like me, the Lazy ones. I ripped a few hundred CDs onto iTunes, now have just a few more thousand CDs left. My progress is slow, plus the flow of “incoming” CDs overwhelms my skills of ripping them. Continue reading Why Discman?
Sony D-90 is a very special Discman. In 1990 this model was selected for an “upgrade” with 1-bit DAC, Discman D-99 was born. Once cheap 1-bit DACs found their way into CD players, it was a matter of months before the race for the “most affordable” player began. We all know how it ended. Opening the way to the slippery slope of ultra-affordable digital, D-90 symbolizes the end of “Classic” Discmans and the end of quality sound reproduction in portable devices. Audiophiles of the 80-ies thought that CD introduction was the beginning of the Dark Ages of home audio. They were right, it was just the beginning, then came MP3, free downloads and “most folks cannot hear the difference” brainwash.
Another unique characteristic of D-90 is its short life-span. With some luck there is still a chance to get D-50, the very first Discman, in perfect working condition. But ALL original D-90 are dead by now. 100% of surface-mount electrolytic capacitors failed at some point between 1990 and 2015. Bad batch of SMD electrolytics? Probably…
One weird technicality not found in any other Discman is that Right channel has 4.7uF/16V “thru hole” electrolytic capacitor in the signal path, but Left channel has 4.7uF/35V surface-mount cap. This SMD cap (C220 on schematics) fails first. When restoring D-90, I always substitute failed C220 for “thru hole” 4.7uF/16V Rubycon electrolytic. I do not care if I can hear the difference or not, both L and R channels must pass through the same parts.
Below is a step-by-step Resurrection procedure for D-90. This is the first thing you see once you remove the bottom plate:
desolder six CD transport wires (spindle and sled motors and Continue reading Sony D-90