06-10-2017, 12:41 PM
At Harpenden there was what looked to be a good Marconiphone Model 22 in the auction. I had wanted one of these for a while so bid and managed to get it.
I also bought some HT battery box’s and an LT box from a stallholder. The HT battery replicas used 12 9V batteries to give from 9 to 108 volts, the second one uses 10 giving 90 volts, the LT battery uses two D batteries and a Motorola 839 which drops the voltage down to 2.6 volts.
The battery replicas are great – there is obviously a lot of work in gone into making them, and I’ve got a GB battery so fired up some old battery sets fine with them – I can now take a 20’s set and a horn speaker out to play in the park .
Anyway, back to the Model 22 - off to my mate Fred’s to play with it Monday. It was fascinating how over engineered Marconi stuff was – the work that went into them!
If you look at the pictures the tuning condenser has glass insulators, and some of the wiring that goes near to other bits that could short it has ceramic beads put on as insulators – must have taken ages.
The valves were Osram P410 and L410, both with full emission.
The tuning/reaction coil is a plug in and twist unit, this one is 250 – 550 meters and needed a bit of a clean.
The wiring loom was with it so I fitted that then fired it up.
It worked fine although plenty of messing to stop the whistling and whining – reaction was tricky. I then ran it with some 2-volt valves as well – slightly better but I think that might be because I used a better 2-volt battery.
Anyway, it’s a fine-looking set and goes well with my other Marconi sets. I might bring this along to Crackle’s little shindig.
I also bought some HT battery box’s and an LT box from a stallholder. The HT battery replicas used 12 9V batteries to give from 9 to 108 volts, the second one uses 10 giving 90 volts, the LT battery uses two D batteries and a Motorola 839 which drops the voltage down to 2.6 volts.
The battery replicas are great – there is obviously a lot of work in gone into making them, and I’ve got a GB battery so fired up some old battery sets fine with them – I can now take a 20’s set and a horn speaker out to play in the park .
Anyway, back to the Model 22 - off to my mate Fred’s to play with it Monday. It was fascinating how over engineered Marconi stuff was – the work that went into them!
If you look at the pictures the tuning condenser has glass insulators, and some of the wiring that goes near to other bits that could short it has ceramic beads put on as insulators – must have taken ages.
The valves were Osram P410 and L410, both with full emission.
The tuning/reaction coil is a plug in and twist unit, this one is 250 – 550 meters and needed a bit of a clean.
The wiring loom was with it so I fitted that then fired it up.
It worked fine although plenty of messing to stop the whistling and whining – reaction was tricky. I then ran it with some 2-volt valves as well – slightly better but I think that might be because I used a better 2-volt battery.
Anyway, it’s a fine-looking set and goes well with my other Marconi sets. I might bring this along to Crackle’s little shindig.
