HPR has 2 different 400Hz Dolby level tapes (positions 5 and 6 on the list) one 200nWb/m and another 218nWb/m and both are DIN. The one...
I a made a mistake there, the actual difference is 2.7dB between 160nWb/m DIN and 200nWb/m ANSI. Edited the post. 200nWb/m ANSI = 218nWb/m DIN...
Yes, very good tapes which I recommend. To be noted HPR sells both 200nWb/m DIN and 218nWb/m DIN (positions 5 and 6 on the list). The Dolby level...
@Lycos The player not reading CD-Rs can mean one of 2 things: - the laser is weak and is not able to produce a strong enough RF on the lower...
There are 2 things I would check: - is voltage actually getting to the PCB ? - does the tape in switch (S702) get closed when a cassette is in ?...
Some manufacturers did publish lifespan of cassette heads, think I have seen it in the past but can't remember where. If I was to see a spec,...
In my experience NOS tapes have performed very well for both pre-recorded or blank ones. This was regardless of their age. There are a few...
One thing I can say is D6Cs with 35712 heads seem pretty rare, significantly rarer than the pointy one. Which makes me believe the change...
You probably can't separate since most of these PDFs are locked and cannot be edited. As a suggestion, don't upload anything from HiFiengine on...
@dotneck335 Can you upload supplements 3 and 4 here ?
There were actually 2 walkans that featured dBx NR: Panasonic RQ-J20X and TEAC PC-7RX. Also the Marantz PMD430 portable recorder featured dBx both...
@Kiwinut Don't know what you mean by "the latest" as what is used now on, for example, Tascam 202 mkVII is not actually Dolby. Generally speaking...
I wrote a tutorial about this walkman: https://stereo2go.com/forums/threads/jvc-cq-1k-restoration.6431/ 1. Bad caps seem likely to me based on...
No, I was reffering to the 3 versions of the heads: pointy, 35711 and 35712 permalloy. Will edit the wording for more clarity.
The 2 service supplements only show changes in the electronics: - Supplement 1 (January 1985) is about replacing the Dolby ICs from CX20068 to...
I lap the heads myself. In regard to serial number, don't know it out of my head but there are a couple of threads about it. Think it was indeed...
I assume the 2 caps that were leaky are the output coupling ones. What do you mean exactly by "the sound fades away" ? Is there a gradual...
100uF gives a corner frequency f(-3dB) of ~50Hz with a 32Ω load, without considering R152 or amplifier's own output impedance (but this is low)....
Bias frequency on D6C is indeed 65kHz.
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