01-20-2023, 10:36 AM
Egad! As all ready stated brass pulleys are the way to go. As far as I know they are interchangeable w/the pot metal ones. The issue maybe finding the brass bands to connect the 3 caps together in synchronization.
I have a 1925 Crosley set that the caps, pulleys, and gears were shot. Badly warped (pot metal ). Did a restomod job by using AK caps and pulleys. Was a tight fit but was able to get them in. Now the belts were the problem. The AK ones were too big and only had one. So I had to make them out of a three liter soda bottle cut into thin strips and perforated at the end. Worked great.
The p/s is not much of a big deal. Find a 6 or 12v transformer @ 3a or so, a bridge rectifier, 10,000mfd @25v or so, LM-317T, and 5k pot. Throw it all together and you get an adjustable power supply from 5 or 11v (what ever the input voltage is) down to 1.5vdc. there's abt a volt drop across the ic. You'll want to keep the input voltage close to max output voltage you need. Else the ic will have to dissipate a LOT of HEAT. The '317 is a cleaver ic in that it has short and over heat protection. It will come back to life after an event good as new most of the time. And there cheep at abt $3. Good for five 01A tubes. The B and C voltages can be supplied from batteries.
https://www.circuitstoday.com/few-lm317-...r-circuits
GL and get out the PB Blaster!
I have a 1925 Crosley set that the caps, pulleys, and gears were shot. Badly warped (pot metal ). Did a restomod job by using AK caps and pulleys. Was a tight fit but was able to get them in. Now the belts were the problem. The AK ones were too big and only had one. So I had to make them out of a three liter soda bottle cut into thin strips and perforated at the end. Worked great.
The p/s is not much of a big deal. Find a 6 or 12v transformer @ 3a or so, a bridge rectifier, 10,000mfd @25v or so, LM-317T, and 5k pot. Throw it all together and you get an adjustable power supply from 5 or 11v (what ever the input voltage is) down to 1.5vdc. there's abt a volt drop across the ic. You'll want to keep the input voltage close to max output voltage you need. Else the ic will have to dissipate a LOT of HEAT. The '317 is a cleaver ic in that it has short and over heat protection. It will come back to life after an event good as new most of the time. And there cheep at abt $3. Good for five 01A tubes. The B and C voltages can be supplied from batteries.
https://www.circuitstoday.com/few-lm317-...r-circuits
GL and get out the PB Blaster!
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
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