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kgallen last won the day on April 4 2020

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  • Sony Products I Own
    MDS-JE520 / MZ-R700 (silver) / MDS-JE530 / MZ-B10 / MZ-NF610 / MZ-N510 (iffy) / MZ-N505 (dodgy hphone amp) / MZ-R700 (won't cal, gold) / MDS-E12 (3 PRO) / MDS-E10 (1 PRO, 1 bust) / MDS-JE440 / MDS-JE480 / DHC-NX5MD / CDP-XE530 / CDP-D12 / MXD-D4 / MZ-R909

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    Gloucestershire, UK
  • Interests
    Amateur theatre lighting and sound (live sound, music and sound effects). With MiniDisc I tend to be I interested in the decks - both Hi-Fi and Pro models.


  • Minidisc units
    As Sony list plus Tascam MD-350 / Tascam MD-CD1 (x2) / Tascam MD-801R (very poorly)

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  1. @sfbpCondolences and best wishes from myself and all at SIF. Take care.
  2. I think I got lucky with my MXD-D4 - I don’t think he put the model number in the title, said ‘MD and CD combo’ or something like that. Other listings for this model have silly prices. I think I’ve been lucky with all my Sony MD purchases, I haven’t paid over £100 for any of them (including the ‘pro’ ones). Did pay £120 for my Tascam MD-350 a few years back and a very silly price for my first Tascam MD-CD1 as I was desperate for a dub solution - it was the first time I’d ever seen such a machine (know better now of course, partly through this forum). I like the 3-line display on the 909 and the metal case is very nice. 🙂 I lie, my 770 was £107. Rest were max £80 I think.
  3. From your parts link, drive is MDM-7S2B which is one of many MDM7 variants using Type-S DSP CXD2664, but not one I’ve come across before. As you can see from your list MDM-7S1A is typical for MDS-JEx80 decks.
  4. See I'm too noisy. That's 3 in a row. Guess I should have done one of those fancy multi-quote things. Sorry folks 😞
  5. Ouch! How did that get past the radar? Might have had a punt on that! I've had a search logged on the 940 for a while now, but not seen anything come up at a half sensible price. I keep getting 930s and 980s. (930 looks a lovely deck but I'd want MDLP. 980 is probably lovely in truth, but I got put off that one when I saw how cheaply constructed the insides were. Probably just me being snobby...)
  6. Agree, I've had this over the past couple of weeks. Very slow/unreliable.
  7. Thought I'd been a bit too noisy on the other thread, so I'd give you all a break! As you ask: MZ-R909 at work now, been listening to it today 🙂 TOSLINK/Coax Output PCB coming on nicely @BearBoy, will share when image uploads are working again.
  8. Many decks in theory. The beauty of at least the Sony decks (or more specifically the Sony DSP chips) is that they use SPDIF natively for the internal digital audio path - on the ribbon cable from the drive back to the main PCB, the audio is SPDIF 🙂 [Note 1]. This means that adding either TOSLINK or Coax output is relatively trivial. All that is needed is a simple 74HCU04 buffer stage plus the output circuit. For optical this is just the optical transmitter. For coax, this can be done "dirty" by just driving that output to an RCA. To be done properly, the coax stage should use transformer isolation as can be seen in Sony's schematics (I'm looking at the MDS-E10 now for instance). Since coax is an electrical connection, the transformer isolation avoids ground loops since the GND/0V of the two interconnected decks are not commoned together. Optical out is easy for me to do now as I know all of the components. For the coax I would like to do it properly, so would want to use the transformer-based output circuit. At this point in time I don't know the specs of the transformer. I suspect it is 1:1 windings, but I don't know the impedance, so I would want to dig into this and find the correct component - not necessarily the exact one Sony use, but the same electrical characteristics. I would need to find the part first, as I would need a PCB footprint to design it in. Research for "another day", but as you've raised this I might do some tentative research. Would coax output be of interest to you? I could probably design a PCB to support both TOSLINK and coax if of interest. For the D4 I want to make a dual-TOSLINK [Note 2]. However maybe I could do a PCB that is single TOSLINK+Coax if this is of interest. [Note 1] Actually the digital audio exists on the ribbon cable in both SPDIF biphase mark (refer back to our work on the Copy Bit Killer) and data+bit clock. On the MXD-D4, the DAC is a Philips part and this takes SPDIF directly (two streams, one from the MD and one from the CD). In "most" other Sony machines, the DAC is something like an AK4524 and this takes separate data+bit clock. In both cases these come straight from the drive over the "narrow" ribbon cable 🙂 [Note 2] You have me thinking now about my own requirements... The E10 has both optical and coax I/O. The E12 only coax I/O. The 520/530/770 have optical I/O plus coax input.
  9. In the meantime I'll dub Steely Dan Aja 🙂 (in real time so I can listen, and hopefully get SP Type-R) whilst looking at the schematics to figure out adding TOSLINK output for both CD and MD. Looks straightforward. Might design myself a small PCB to make the job really tidy 🙂 (if I do there will be lots left over for give-aways 🙂 as I'll need to order 10).
  10. Picture attempt… didn’t work, same issue as reported by @BearBoy
  11. MZ-R909 seems have charged the new gumstick battery just fine and works with it! Charging the second battery I bought in it now. As @BearBoy says it’s always a worry when you spend out on a machine! So far this week it looks 2-for-2 🙂
  12. Well the MXD-D4 CD section reads CD-R which is great. As I trial I've just dubbed a CD-R of show music to MD at x4 rate. Seemed to work perfectly (just listening through now). Track titles are also copied. Up to now, I've been using my Tascam MD-CD1 to dub CD-R masters of show music/sound effects to MD (which are used live in the shows) but the MD-CD1 machine do have some issues with titles (in addition to adding gaps between tracks). So I'm hoping this MXD-D4 can take over those dubbing duties, which in theory means I can also create a backup MD more easily. With the MD-CD1 I would often need to go in with a PS/2 keyboard to fix titles (these are key since the titles hold the cue number) so making a second copy was always a pain... 👍
  13. This week I've also mostly been buying an MXD-D4. 😄 Arrived today. Gave it a service, seems to work ok. More later... The MZ-R909 also arrived just as I was finishing up with the D4. Seems to work ok with AA cell (in sidecar). Gumstick contacts a bit green. Given them a clean and it's now charging on in the unit. Also more later...
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