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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 8th Nov 2019, 1:08 am   #1
dan.mih
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Default Philips 374 Radio Cassette Recorder

Hello,

I have found a very good looking radio cassette player Philips 374. It has a great sound, it feels like your are near a modern soundbar .

Unfortunately, the cassette player is defective. One gear (orange, indicated by arrow) has many teeth missing. The plastic is very fragile, the teeth fall if you touch them.

I have asked if a 3D print can replace the wheel, but I have received answers about uncertain results. The gear may be subject to rapid wear due to forces applied.

In this situation I am asking:
1) Is this a common design of Philips cassette players? If yes, can somebody give more details about what models were fitted with this unit?
2) I have disassembled a few parts of the cassette player. What is the purpose of the contact around the gear that turns the cassette?
3) Does somebody have a service manual of this type of cassette player?
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Old 8th Nov 2019, 1:21 am   #2
cmjones01
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Default Re: Philips 374 Radio Cassette Recorder

That's a splendid looking machine, proper Philips distinctiveness. I've certainly heard of gears in cassette decks falling apart, but I don't know what to do about this one. However, the contacts around the takeup spool are probably for sensing that the tape is moving correctly, and activating the auto-stop mechanism if the spool stops rotating. I once had a Philips car cassette player which used the same method, and it had a solenoid-operated stop mechanism.

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Old 8th Nov 2019, 3:57 am   #3
Maarten
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Default Re: Philips 374 Radio Cassette Recorder

Indeed a very common problem, as Philips used some kind of polyurethane to dampen the noise on some gears. Polyuretehanes (brought to you by the makers of sticky rubber goo and glazed pinch rollers) aren't the most stable materials. Luckily, mfbfreaks.com has hard plastic replicas for some of those gears. If you can't find it on their site, you could mail them or ask on their forum.

P.S. the polyurethane doesn't really crumble from the forces, but due to chemical instability. It seems to be accellerated somewhat in damp environments, with the polyurethane even giving off some slighly corrosive byproducts when it falls apart completely if the environment is really damp.
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Old 9th Nov 2019, 7:45 am   #4
camtechman
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Default Re: Philips 374 Radio Cassette Recorder

Grundig C400 series cassette machines have a similar problem; (the gears turn to a jelly consistency).
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Old 10th Nov 2019, 6:57 pm   #5
unitelex
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Default Re: Philips 374 Radio Cassette Recorder

If you can remove the gear without it completely falling apart, you might be able to find somebody skilled with a small milling machine and lathe who could copy it. A material such as Delrin/Acetal/Nylon is easy to machine and would be reasonable durable.

But there would need to be enough of the gear remaining so that the diameter, tooth pitch and axle sizes could be measured.
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Old 10th Nov 2019, 8:13 pm   #6
ben
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Default Re: Philips 374 Radio Cassette Recorder

whilst you are in there, check/change the pinch roller and erase head (the latter tends to fall to pieces and may leave sticky residue on tapes!)
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