11-13-2020, 08:24 PM
I have a 48-230. I got this from my Father when I was very young, it used to work but hasn't been used in approximately 45 years and it was lost for awhile, looks like something heavy fell on it.
The Cabinet is long gone, I had to replace the speaker and output transformer. The IF Transformer behind the speaker had a big dent and I repaired the wires torn loose inside and got out much of the dent. Totally recapped. Cleaned up the chassis rust. Replaced a few resistors as needed.
Now, since the cabinet is gone so the antenna loop no longer exists. According to the schematic this part appears to also be a functional part of the main tuning LC circuit. I need to know the approximately dimensions of the antenna loop and the number of turns.
The Photofact shows that the coil is DC resistance of 2.5 ohms. Is t possible for me to make a coil based on that resistance? Or do I need specific xx uH microhenries of inductance for this to work.
I can inject audio into the grid of the 14B6. Currently I get a lot of heterodyning at various frequencies but I think that is because of the lack of the antenna coil. I believe I have the IF roughly aligned by viewing it on the scope for maximum amplitude on the modulated 455kHz.
I have a tube tester, oscilloscope, Jackson Electric Frequency Generator, VOM and a low voltage Asian component tester - and a few other tools.
Once I get this running again I will need to determine what kind of cabinet to give. I made a 3D printer and I've thought about designing a new front panel similar to the original Flying Wedge that it had. I'll post that in the other section when that time arrives.
The Cabinet is long gone, I had to replace the speaker and output transformer. The IF Transformer behind the speaker had a big dent and I repaired the wires torn loose inside and got out much of the dent. Totally recapped. Cleaned up the chassis rust. Replaced a few resistors as needed.
Now, since the cabinet is gone so the antenna loop no longer exists. According to the schematic this part appears to also be a functional part of the main tuning LC circuit. I need to know the approximately dimensions of the antenna loop and the number of turns.
The Photofact shows that the coil is DC resistance of 2.5 ohms. Is t possible for me to make a coil based on that resistance? Or do I need specific xx uH microhenries of inductance for this to work.
I can inject audio into the grid of the 14B6. Currently I get a lot of heterodyning at various frequencies but I think that is because of the lack of the antenna coil. I believe I have the IF roughly aligned by viewing it on the scope for maximum amplitude on the modulated 455kHz.
I have a tube tester, oscilloscope, Jackson Electric Frequency Generator, VOM and a low voltage Asian component tester - and a few other tools.
Once I get this running again I will need to determine what kind of cabinet to give. I made a 3D printer and I've thought about designing a new front panel similar to the original Flying Wedge that it had. I'll post that in the other section when that time arrives.
