Re: Gramophone Input and Bluetooth
From a quick look at the schematic it looks like it has a gram setting on the waveband switch, so no radio muting required. The hand-drawn circuit on the above mentioned thread should work well for you without any need to modify the krc-86b for radio muting. If you've replaced c12 (schematic on RM) you don't need an additional isolating capacitor on the krc-86b output.
As an aside, an external Bluetooth module works equally as well with much less hassle, but you obviously need to keep it charged.
Gabriel
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