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Perpetuum Ebner Turntable

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » Perpetuum Ebner Turntable
           
Ake Nyholm
Ake Nyholm
 
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27.Mar.06 17:03

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Dear all,

I am restoring a radio receiver (from 1960) having also Perpetuum Ebner turntable type4230PE _Stereo (127V -50Hz, 6w)included. Unfortunate the turntable motor does not work because of the "Black" component, shown in attached picture, is open in circuit. I assume the "black" component is wire-wounded resistor but its value is unreadable. There are anyhow very dim numbers 25 on view.

Could somebody kindly help and advice me what is this Black component?

Best regards
Ake

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Wolfgang Bauer
Wolfgang Bauer
 
A  Articles: 2413
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27.Mar.06 17:36

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Hello Mr. Nyholm,

when your model is built for 127 Volt, it is an resisitor approximate 1,8KOhm / ca. 8 to 10 Watt for using on 230 Volt. But control the 127 Volt direct on the connexion of the motor.
I calculate it for 6 Watts.

Regards WB.

This article was edited 27.Mar.06 17:36 by Wolfgang Bauer .

Ake Nyholm
Ake Nyholm
 
FIN  Articles: 99
Schem.: 59
Pict.: 163
27.Mar.06 19:06

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Hi Mr Bauer,

Thank you for your comments.
Actually there is a "trick" because of radio's mains trafo has input for 110V and 127V. Turntable is connetecd to 127V point (autotrafo) for 220V.
I understand now that the "black" component is a resitor but obviously smaler than you did mention. Would it be 25 Ohms?

Best regards
Ake

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Wolfgang Bauer
Wolfgang Bauer
 
A  Articles: 2413
Schem.: 13998
Pict.: 6869
27.Mar.06 20:12

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Hello Mr. Nyholm,
could you make a drawing, that i know, how your "tricky" ;-)) is working?

Regards WB.
Ake Nyholm
Ake Nyholm
 
FIN  Articles: 99
Schem.: 59
Pict.: 163
28.Mar.06 10:09

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Hi Mr. Bauer,

Please look at attached picture. Unfortunately original circuit diagram was very blury but hopefully readable.
I also made a drawing how I understan the voltage selector connection should be when the mains input voltage is 220V.

Regards
Ake

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Wolfgang Bauer
Wolfgang Bauer
 
A  Articles: 2413
Schem.: 13998
Pict.: 6869
29.Mar.06 11:51

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Hello Mr. Nyholm,

Now I looked in my 220Volt model, there is no resisitor.
The capacitor in my 220Volt model is 0,16µF. In your 127Volt model it is 0,6µF.
Where does the resistor go to?
Normally your record player must work on 230Volt, when your wiring diagram is all right.

Regards WB.
Ake Nyholm
Ake Nyholm
 
FIN  Articles: 99
Schem.: 59
Pict.: 163
30.Mar.06 17:57

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Hi Mr. Bauer,

Thanks again about your comments.
I assume that my previous drawing was not so clear and therefore I made another one to show more illustrative view. The turntable is really working with 127V ac, please kindly look at attached photo and drawing.
You did ask to where the resistor X is connected. Unfortunately parts of the wires are hided by some mechanical parts in the turntable and I don't dare to break up those. There are some springs, which may jump off etc. From my drawing you hopefully can get some ideas, but how the wires are connected between the motor poles I don't see.

In the meantime I replaced the original (broken) resistor with new one having value of 25ohms. Now the turntable motor is running in "proper way" but I don't know if it is electrically OK.
It should be nice to here comments.

Regards
Ake

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Wolfgang Bauer
Wolfgang Bauer
 
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30.Mar.06 18:30

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Hello Mr. Nyholm,

now all is clear, it is a protective resistor.
I think, your resistor is quite correct.

Regards WB.
Otmar Jung
 
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30.Mar.06 23:18

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Hello Mr. Nyholm,
if you can measure the resistance from each of the both leads to the broken point then you can calculate a value near of the original resistor.

Regards
Otmar Jung
Ake Nyholm
Ake Nyholm
 
FIN  Articles: 99
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Pict.: 163
31.Mar.06 19:15

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Hello Mr. Jung,

Thank you, Your hint was very useful. Even the measurement, due to resistor body insulator, was not so easy, I learned that my earlier quess of 25Ohms was one decade to low. 250ohms seems to be more correct.

Regards
Ake

  
rmXorg