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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 9th Dec 2018, 5:27 pm   #1
karachay
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Location: Fethiye, Muğla, Turkey
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Default Grundig TK148

hi. my friend grandfather die so he get some old electronic machines. one of them tk148. it was dead not working. he want i check it if i can turn back it life. i fix many parts of it but i get new problem and i cannot find why.

first it work mechanic way but no sound. but now when i try to rewind 2 wheels turning different way. play pause and ff working fine. rewind mode counter look like i am on ff mode it going up and 2 wheels turning different ways and some times wheels turning really slow in play mode.

any idea what is happenning

sory for bad english and thank you for helps...
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Old 9th Dec 2018, 7:48 pm   #2
karachay
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Default Re: Grundig TK148

i find the problems. i want to write it for maybe some one make same mistake. i clean inside it with wd40 cleaner cause its too much rusty. and when i clean moving metal parts with wd40 cleaner it go on small wheel i think name is Pressure Roller. so oil from wd40 make it slippery. and the volume problem i find that volume control resistor name is r506 on schematic 100k liner pot is broken. i short the resistor and all is fine now. but i need find the resistor for replace it and then all will be fne.

i am looking for that pot now. if any one know where can i buy it please write here. thank you for this web side. its good feeling that we have some place there in internet we can talk abouth old electronics and mechanics...
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Old 10th Dec 2018, 2:40 pm   #3
ben
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Default Re: Grundig TK148

Good news!
Unfortunately I think the 100k linear pot might be unique to this machine. You might find something you can use on other Grundig machines from the early-mid 1970s such as radios, music centres, etc. So keep a look out for scrap units in local second hand markets or stores, or those sold as not working online, which you could use for parts.
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Old 11th Dec 2018, 8:26 am   #4
Robstan234
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Default Re: Grundig TK148

Hi 100k linear pots are available at RS Components which you may be able to adapt.

Rob
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