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Old 15th Aug 2022, 5:59 pm   #2
frsimen
Heptode
 
Join Date: Jan 2011
Location: Croydon, London, UK.
Posts: 760
Default Re: PHILIPS B5X44A VHF Tuner head wrong LO frequency

C413 is part of a neutralising circuit. Murphy used to use something similar and had a note in their service manual that the value is critical. Too low and you get unwanted oscillation, too high a value and local oscillator won't oscillate.

Your set may work if C413 is replaced with a new 110pF component.

Paula
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