Thread: Philips N4450
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Old 5th Aug 2017, 4:48 pm   #27
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,188
Default Re: Philips N4450

I may not need to use a calibration tape. I get low gain on one channel in AMP mode (not using the tape). If I touch the appropriate pins of the tuner input (all controls set appropriately) I get a much stronger buzz on the right channel than the left. However I have now found that a microphone plugged into each microphone socket in turn gives the same deflection on the appropriate level meter when I speak into it. This suggests to me (confirmed by the unequal buzzes when I put the demagnetiser on the heads) that the fault is in the tone control or power amplfiier areas. I will inject a steady signal and trace it with a 'scope.
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