11-30-2005, 10:37 AM
Chris, here are some answers:
1. See LINKS either here on Ron's site or mine for pickup replacements and/or repairs.
2. The one pickup connection probably ties to chassis possibly near the junction of resistor 11 and cap 13 or the 6A7 socket grid pin. Schematic does not show if this is a shielded cable - I assume it might be. If so, shield should run almost to the tube's grid pin for max hum shielding, since this is a high impedance pickup.
3. The junction of cap #6 and the other side of the AC line cord which is also one side of the power transformer primary. See schematic.
4. That jack is probably for an improvised "external audio input" to the oscillator instead of the phono pickup. Not factory original. This is not a radio that can use a speaker for any reason. It is a simple one-tube oscillator circuit (6A7) for transmitting.
Pin 5 is the grid and anything else tied here could induce hum, depending on lead dress.
1. See LINKS either here on Ron's site or mine for pickup replacements and/or repairs.
2. The one pickup connection probably ties to chassis possibly near the junction of resistor 11 and cap 13 or the 6A7 socket grid pin. Schematic does not show if this is a shielded cable - I assume it might be. If so, shield should run almost to the tube's grid pin for max hum shielding, since this is a high impedance pickup.
3. The junction of cap #6 and the other side of the AC line cord which is also one side of the power transformer primary. See schematic.
4. That jack is probably for an improvised "external audio input" to the oscillator instead of the phono pickup. Not factory original. This is not a radio that can use a speaker for any reason. It is a simple one-tube oscillator circuit (6A7) for transmitting.
Pin 5 is the grid and anything else tied here could induce hum, depending on lead dress.
Chuck Schwark,
The Philco Repair Bench
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