Neuling, Philips 544

Alles over onze geliefde MFB boxen in deze categorie.

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lionx
Berichten: 3
Lid geworden op: 25 nov 2007, 19:14

21 jan 2020, 17:16

I have some MFB, all in a good condition.
Now I want to repair the 586 I have got.
My Problem:
I got 586 with a strong hum. I found the reason of the hum, the conection on the woofer was wrong. I have corrected that -OK, no hum.
When I want to set the factory adjustment I do this:
R 3501 counterclockwise
R 3460 clockwise
77,5 mV / 90 Hz (=0dB), it shows me 1,2V. true RMS
now I should have 38,8 dB= 6,75V
but the tension decreases and does not increase. What is wrong?
Or is the MFB sensor demaged because the connections at the woofer was chanched?
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HermanH
Berichten: 3879
Lid geworden op: 22 mei 2015, 20:39
Locatie: Omgeving Breda

22 jan 2020, 15:52

Niemand ?
Binnenkort uitverkoop
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Lucasamerongen
Berichten: 163
Lid geworden op: 30 aug 2018, 19:06

22 jan 2020, 16:35

lionx schreef:
21 jan 2020, 17:16
I have some MFB, all in a good condition.
Now I want to repair the 586 I have got.
My Problem:
I got 586 with a strong hum. I found the reason of the hum, the conection on the woofer was wrong. I have corrected that -OK, no hum.
When I want to set the factory adjustment I do this:
R 3501 counterclockwise
R 3460 clockwise
77,5 mV / 90 Hz (=0dB), it shows me 1,2V. true RMS
now I should have 38,8 dB= 6,75V
but the tension decreases and does not increase. What is wrong?
Or is the MFB sensor demaged because the connections at the woofer was chanched?
Was the woofer connection connected to the sensor?
Oud naar nieuw :D
lionx
Berichten: 3
Lid geworden op: 25 nov 2007, 19:14

23 jan 2020, 09:43

The speaker connection was mistaken. The connection to the Mfb sensor is ok.
lionx
Berichten: 3
Lid geworden op: 25 nov 2007, 19:14

23 jan 2020, 12:49

Sorry,, my DC generator gives me a wrong tension. This is the problem.
Thanks
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