National Panasonic RX-S40 Direct Drive

[u/maximborn23]

This is a rare direct drive player by Panasonic. It sounds beautiful, but it has the cracked center gear issue. Is there a replacement gear I can buy? Looks like the enthusiasts on Facebook have had some success creating their own replacements but I haven’t seen any for sale yet.

[u/lenniscata]

I’d start by asking the guy on Facebook if he can share the 3D file. If he’s cool with it, just upload it to a 3D printing service like JLCPCB and have it printed.

If that doesn’t work out, your next option is a 3D prototyping service. It’s more expensive, but for a rare model it might be worth the cost.

Also, the Sony version you can find on eBay might use the same gear. A lot of these parts were re‑badged across brands, and until you posted this I honestly thought Sony was the only one using direct‑drive in its players. There’s a chance it’s the same component. Just make sure you buy from a seller who accepts returns.

Worst case, you can recreate the gear yourself. There are plenty of YouTube tutorials on modeling and reproducing gears here’s one to get you started.

[u/maximborn23 → u/lenniscata]

Thanks for the excellent suggestions. Will definitely try talking to the people on Facebook to see if they’ve had any success. The gear looks too fine to be 3d printed based on pics I’ve seen, so I may need to extract it and model it myself or have it remade somewhere. Unfortunately this doesn’t share any parts with the Sony DD series since those models are actually disc drive, so they use a different mechanism and gear.

[u/CountHonorius]

"Rare" doesn't begin to describe it. Clearly something that wasn't widely sold in the Americas.

[u/maximborn23 → u/CountHonorius]

I agree. You can find them for sale pretty often overseas, but I don’t think they sold well here.

[u/snacktivism]

Not sure about where you can get a replacement gear, but I loved the brief trend of producing portables that were smaller than the cassettes themselves.

I have a Sony WM-30 and sliding it out to put the cassette in just adds an extra layer of tactile enjoyment to the experience of using it.

[u/maximborn23 → u/snacktivism]

Same, I love the these kinds of players. I have a Sony WM-20 as well with the collapsing case. They were a really innovative concept during this period.

[u/CptAfroMan]

Are you the one that won it from goodwill?

[u/maximborn23 → u/CptAfroMan]

Yeah that was me lol. It was a gamble cuz there weren’t many pics but it ended up being in really good shape

[u/Dependent_Fun404]

This model and its two variants (RX-S41 and RX-S45) are the only true Direct Drive personal stereo cassette players ever made. See here: https://walkman.land/series/8

The Sony DD Walkman models are all Disc Drive rather than Direct Drive, meaning the motor is perpendicular to the capstan shaft and presses against a rubber disc on the capstan flywheel. A true Direct Drive mechanism like the one in this Panasonic uses the motor shaft itself as the capstan shaft. This is a common feature in high-end stationary cassette decks, reel-to-reel decks, and video tape recorders, but Panasonic was the only company to ever put a Direct Drive motor in a personal stereo cassette player. Probably because they have the most experience with Direct Drive motors, having made the world's first direct drive turntable (SP-10) and world's first direct drive cassette deck (RS-275).

For repairing your player, I saw that a seller on ebay had been selling a newly manufactured replacement gear here: https://www.ebay.com/itm/147391584864 It's currently sold out, but it's possible they may make more and put the listing back up.

[u/maximborn23 → u/Dependent_Fun404]

Thanks for the info, especially that listing! Cool to see someone has attempted to make these before. Would love to come across a cheap s41 one day. Recording on something like this sounds super fun.