09-12-2018, 12:05 PM
I got this from a junk shop for £2! I would be interested to find out what year it was in production, and what make. The known facts about it are:
Domestic TRF (Tuned Radio Frequency) radio receiver, two waveband. Four valve, live-chassis mains. Valve line up:
RF amplifier: 6K7 Variable mu pentode. 6.3 Volt heater at 0.3 Amperes.
Detector: 6J7G pentode. 6.3 Volt heater at 0.3 Amperes.
Output: 25AG6 pentode. 25 Volt heater at 0.3 Amperes.
Rectifier (missing) Not known, but would certainly have 0.3 Ampere heater current.
Mains dropping resistor, or line cord, missing.
General state: In the final stages of decay!
I will need to figure out the circuit from what is left, but not all that difficult a task. It will probably not take much to get it working again either, but smartening it up physically is a different matter.
Never having been much good at book-learning, especially electronics, I have always enjoyed a challenge such as this, of bringing back old radios from the dead!
Bob
Domestic TRF (Tuned Radio Frequency) radio receiver, two waveband. Four valve, live-chassis mains. Valve line up:
RF amplifier: 6K7 Variable mu pentode. 6.3 Volt heater at 0.3 Amperes.
Detector: 6J7G pentode. 6.3 Volt heater at 0.3 Amperes.
Output: 25AG6 pentode. 25 Volt heater at 0.3 Amperes.
Rectifier (missing) Not known, but would certainly have 0.3 Ampere heater current.
Mains dropping resistor, or line cord, missing.
General state: In the final stages of decay!
I will need to figure out the circuit from what is left, but not all that difficult a task. It will probably not take much to get it working again either, but smartening it up physically is a different matter.
Never having been much good at book-learning, especially electronics, I have always enjoyed a challenge such as this, of bringing back old radios from the dead!
Bob
