Logodave wrote:... I have had 3 model -d's and as nice as they are, the new boy (Voyager Old School) can be processed, compressed and what else you want to do. It sounds so much better, it's dependable 24/7. This machine will outlast your lifetime...
That's pretty much debatable. And I'm not at all convinced of that. Don't get me wrong, the Old School is a fantastic instrument. But as far as lasting 40+ years ? Not really sure. There are over 800 parts on the analog sound producing board alone, way more than inside a Mini D. The probability of one of them going bad is rather high, 40 years from now.
Just the fact that the internal PSU is a switching type is enough to believe it will fail way before that. I'm talking from experience in fixing electronic devices. Designing such a PSU requires high grade components, and precise tolerances. And when they do fail, they pretty much can't be fixed without spending more than their value in repair time and expense. Also, before going completely bad they can cause all sorts of problems, noise on power rails, auto-shut down and power-up cycles. And finally, they're much more "noiser" than linear PSU because they operate at very high frequencies, requiring complex and efficient filtering.
That's why I'd rather have a good old linear PSU consisting of a transformer, a rectifier bridge, some big electrolytic caps, and a regulator. Simple design, easy to fix, easy to maintain (simply replace caps every 10-15 years as preventive measure). Less noisy, but also less efficient and bulkier, I'll give you that. But much more durable.
As for Alpha potentiometers used in the Voyagers, I'm not sure they will last 40+ years as the heavy duty Allen Bradley Type J in a Mini D either. And what about those 20+ trimpots inside ?? One, or more of them will surely fail before a lifetime.
As for keyboard bushing, they will last about the same. But the electrically conductive rubberized contact will surely wear out much sooner than gold-plated coil springs and buss bars in a Mini D. Just see what happens with TV remote controls ? After a few years, you have press so hard on buttons for them to work. If you're lucky, you can open them without breaking the casing and clean the contacts with isopropyl alcohol. But each time you do, it last less and less...
In all my years at fixing synths, the only keyboard I saw that was truly designed to last a lifetime was from Ensoniq on their SQ-80 and EPS models. Where there was no mechanical contacts at all, but rather an ingenious inductive system, where a metal plate underneath each note would move closer to an inductor coil for each note (metal detector circuit) and be scanned sequentially by a microcontroller and an A/D converter. As a bonus, velocity values as well as polyphonic aftertouch could be easy to calculate. (by pressing on a note to compress a little rubber pad further and moving the metal plate even closer to the coil)
In conclusion, sure some Mini D today are in bad shape, but I'm convinced that they're still more easily fixable than the Old School (or Voyager) will ever be, 40 years from now.
Sound is a non-issue.
EDIT: I was very unlucky that in the short time I had My Old School (about a year and a half), it broke down. The random sample-and-hold circuit of the LFO failed. Had to be sent twice to authorized repair shop, because the first time it wasn't fixed completely because they attempted to replace only some parts. The second time, they had replaced the whole board, and it was fixed. As I said, I was very unlucky...or was I ?