05-27-2023, 01:15 PM
The 655 is re-capped, re-resistored, lightly rewired, re-aligned, and it functions, yay.
But in my area, AM reception is sparse, and where the radio must sit at home, there is no ground and few options for stringing antennas... so I want to add a minimally invasive Bluetooth device.
The 655 schematic shows a presumably optional (but not present on my unit) DPDT On-On switch for flipping between Radio and Phono. The switch, in Phono position, disconnects the 6A7 cathode from ground, grounds the detector AF output line, and sends the Phono signal to the volume control instead. Nice, I can substitute the Bluetooth line-out there and still use the 655's AF amplifier, staying mostly true to the Philco design intent.
Question: Anyone have images of how this was realized in production? Where the leads came out of the chassis?
My 655 chassis has one virgin knockout in back that could accept a 1/4" jack, or maybe a grommet for the required 4 wires to come out to an externally mounted switch. And with the phono, there should be an additional 2 power wires for the turntable.
Or... maybe the phono option was never offered, or only in Radiobar models?
But in my area, AM reception is sparse, and where the radio must sit at home, there is no ground and few options for stringing antennas... so I want to add a minimally invasive Bluetooth device.
The 655 schematic shows a presumably optional (but not present on my unit) DPDT On-On switch for flipping between Radio and Phono. The switch, in Phono position, disconnects the 6A7 cathode from ground, grounds the detector AF output line, and sends the Phono signal to the volume control instead. Nice, I can substitute the Bluetooth line-out there and still use the 655's AF amplifier, staying mostly true to the Philco design intent.
Question: Anyone have images of how this was realized in production? Where the leads came out of the chassis?
My 655 chassis has one virgin knockout in back that could accept a 1/4" jack, or maybe a grommet for the required 4 wires to come out to an externally mounted switch. And with the phono, there should be an additional 2 power wires for the turntable.
Or... maybe the phono option was never offered, or only in Radiobar models?
