Impressive that it has not only a servoed capstan but also servoed back-tension! No pilot tone, though, eh?
WoW!! A poor-man's Nagra! What tape speed did it run at?
Looks good. Don't know about the missing service bulletins.
Aha! I now see the change of motor part #. My bad. From Deb64: "This is where it gets a bit confusing as I have seen several D6Cs with the older...
1991's change of 220uF capacitor designation 138 to 318 is not really a revision; it's just a correction of the schematic. The PCB was actually...
Thanks! Does your unit also have the -12 PCB with the CX20218 Dolby chips?
@Lee Finney: THANKS! That does help! It confirms that the pointy heads DID remain until the 71xxx range. I have now established the change from...
Yes, that's a good idea. I am curious as to why your experiment with the OPA failed. The only possibility I can imagine would be if you...
Well, a total of 9 mA more current probably won't make a lot o' diff in most cases. The one thing that was very attractive to me about the OPA1642...
Well, that's very interesting. WHAT didn't work at all? How did it sound worse? Did it oscillate? I think that the OPA1642, being a faster chip,...
Here is my version of the history of the Sony Walkman WM-D6C. Compiled from postings on Stereo2Go and tapeheads forums, as well as eBay listings...
Yes, you are correct...it IS within spec; perhaps even a bit better, being essentially +0, -3 db from 40 to 15 KHz. BUT a 1000zxl will do...
The published spec for frequency response on a Sony Walkman WM-D6C is +/- 3db 40-15000Hz. That's not very impressive. Has anyone been able to...
I guess "flat" response is a relative term. Your graph shows ~-5db @ 18 KHz. Is that normal for a WM-D6C? Is your graph showing overall...
One thing I am stumped about is the "version" change reported around serial # 180000. This was stated in the "DD drive genealogy" posting. I can...
In the case of playback frequency response, using HPR test tape, what is recommended if the PB response is not flat? I know there are no PB...
Are the HansPeter Roth (HPR) Dolby level tapes actually 200nWb/m ANSI? Someone posted on tapeheads that they are 200 DIN.
What are the dis-assembly instructions for the WM-D6C to gain access to the calibration adjustments?
".... a 200nWb/m tape would output 2.4dB higher than an 160nWb/m tape." Uh, NO. That would actually be 1.94 db difference.
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