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.
The 35711 head has around 120mH @ 1kHz. As far as the general difference between amorphous and permalloy, it really depends on the particular...
The C138 I'm reffering is the one going to pin 20 of Dolby IC, as I was reffering to just 1. The output coupling ones get replaced in pair if they...
Maximum height of D6C capacitors depends on where each cap is positioned, as in some places there is space for ones taller than the original. For...
Here is the tutorial: https://stereo2go.com/forums/threads/sony-wm-d6c-no-rewind-ff.4687/
AIWA PL30/303, PX30/PX303, PX50/505, PX900, JX30/303, PL50/505, HS-F505, HS-JL30/303, HS-PL55/555, HS-F50/F505 These units are very similar,...
Panasonic RQ-P580/RQ-P500/RQ-P515/RQ-P525 (uses 3-phase brushless motor) Panasonic RQ-JA150/RQ-JA155/RQ-JA158/RQ-JA160/RQ-JA170/RQ-JA180 (uses DC...
I typically don't replace capacitors just because they're old. Rather, I prefer measuring them on LCR meter and compare with typical parameters of...
This model uses a 0ZM mechanism, so things like re-lubrication, bent pinch roller holding pins and bent head bridge are to be expected. They're...
You can find the PCB diagram here: https://www.petervis.com/manuals/sony-wm-d6c/pcb-and-wiring.html It's in black and white, but the traces are...
In regard to the diode I attached a picture. The simplest way I see is remove that jumper wire and add the diode there (it may require enlarging...
If you want protection from both DC in jack and batteries, you will have to cut quite a few traces. In my opinion putting all 4 batteries...
Some speed difference is normal to exist on most autoreverse walkmans, if it's within 30Hz or so would consider it normal. This difference can be...
Lubriplate 105 is a generic grease designed of automotive applications. As far as grease goes, would prefer white lithium grease to this one. For...
@Anthony I would try another cable. Looking at pictures on ebay, the jack itself looks a bit off with sleeves being longer than normal. Not sure...
Yes, the DC-DC converter schematic is flipped horizontally, it's an error in the service manual. This is obvious if you look at the internal...
Rule of thumb is the rating should (ideally) be twice the operating voltage or more. We also have space constraints in most cases. Will take the...
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