
Here is one of the radios that I have nearly finished restoring. Everything is complete, except for the silk screening on the front panel. The horn speaker is a Tower with a Music Master driver (the driver has been rewound and the magnets recharged), and I made the antenna myself. It uses a 6-volt SLA battery for the filaments, and 10 9-volt batteries for the B+, with a tap at 45 volts for the detector. It uses five 201A tubes.
The radio plays beautifully and performs incredibly well!
So, what have I done with it...
-Refinished the cabinet
-Made a new front panel out of black plexiglass
-Stripped down the bread board completely
-Reworked the tube sockets
-Gutted the old grid-leak resistor, replacing it with a new, 2.2 meg. carbon film resistor, so it looks original
-Gutted the old capacitors and installed new ceramic capacitors in them so that they look completely original
-Cleaned up all the connections
-Reworked the Volume rheostat
-Rebuilt the variable condensers
-Replaced the power resistors
-Rebuild the interstage transformers
Note about these: As usual, I want the radio to look completely original, so I chose to rewind them rather than replace them. It turns out that the iron in them was very rusty. I replaced it with similar-sized modern transformer laminations. I wound both with 1,500 turns of 40 awg wire on the primaries. One has 4,500 turns of 45 awg wire on the secondary, and the other has 7,500. They look completely original, but they have modern guts!
-Refinished the breadboard with shellac
-Reinstalled all the components
-Put it all back together
The radio plays beautifully and performs incredibly well!
So, what have I done with it...
-Refinished the cabinet
-Made a new front panel out of black plexiglass
-Stripped down the bread board completely
-Reworked the tube sockets
-Gutted the old grid-leak resistor, replacing it with a new, 2.2 meg. carbon film resistor, so it looks original
-Gutted the old capacitors and installed new ceramic capacitors in them so that they look completely original
-Cleaned up all the connections
-Reworked the Volume rheostat
-Rebuilt the variable condensers
-Replaced the power resistors
-Rebuild the interstage transformers
Note about these: As usual, I want the radio to look completely original, so I chose to rewind them rather than replace them. It turns out that the iron in them was very rusty. I replaced it with similar-sized modern transformer laminations. I wound both with 1,500 turns of 40 awg wire on the primaries. One has 4,500 turns of 45 awg wire on the secondary, and the other has 7,500. They look completely original, but they have modern guts!
-Refinished the breadboard with shellac
-Reinstalled all the components
-Put it all back together
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File Size 179.6 kB
Holy Carp Batman!
Talk about stripping her down and building from the ground up! I'm impressed! *bows* I'm Not worthy!
I have a few radios with defective audio transformers which I want to learn to rewind them. Simply because no modern day replacement will work and perform as original. A friend of mine used to rewind his transformers on his father's lathe, so I picked up one of those small Chinese lathes at Harbor Freight back when they had them on sale for $320. I'm so glad I bought that thing as I have used it to shape metal and cut open electrolytic cans so often, it was well worth the money!
Your loop is beautiful! I too built a similar one and found out with a variable cap, a 1N34 diode and a crystal earphone, it works great straight as a crystal set!
I've picked up many stations on it without an external aerial or ground. If you haven't tried that, give it a whirl!.
Great work on your Music Master!
Talk about stripping her down and building from the ground up! I'm impressed! *bows* I'm Not worthy!
I have a few radios with defective audio transformers which I want to learn to rewind them. Simply because no modern day replacement will work and perform as original. A friend of mine used to rewind his transformers on his father's lathe, so I picked up one of those small Chinese lathes at Harbor Freight back when they had them on sale for $320. I'm so glad I bought that thing as I have used it to shape metal and cut open electrolytic cans so often, it was well worth the money!
Your loop is beautiful! I too built a similar one and found out with a variable cap, a 1N34 diode and a crystal earphone, it works great straight as a crystal set!
I've picked up many stations on it without an external aerial or ground. If you haven't tried that, give it a whirl!.
Great work on your Music Master!
Thanks a bunch!
I really went overboard on just about everything, but in the end, it really came out well! A lathe would be nice, but I don't have much money, so I just stick with my drill...
If you want to know more about rewinding interstage transformers, send me a note. I'll be happy to go into detail!
I really went overboard on just about everything, but in the end, it really came out well! A lathe would be nice, but I don't have much money, so I just stick with my drill...
If you want to know more about rewinding interstage transformers, send me a note. I'll be happy to go into detail!
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