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Old 21st Oct 2019, 12:18 pm   #4
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 10,310
Default Re: FT-101ZD sizzling sound on tune up into dummy load.

As mickm3for says, the coupling-capacitor from driver-anode to PA-grid is a known weakness in these radios - you could say it's the equivalent of "that capacitor" in valve broadcast-radios!

If it goes a bit leaky it can cause all sorts of odd and inconsistent behaviour of the PA-current during tune-up. If it fully-fails you'll be needing a new set of PA bottles and possibly a new mains-transformer too.
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