12-30-2021, 07:29 PM
No, I didn't forget.
This year I picked the chassis of a Philco 41-KR, which uses the same chassis as those tiny five tube Transitone/Philco Transitone models.
Before picture:
After picture:
Before picture, underneath:
After picture, underneath:
I heard it play on Christmas Eve, so I'm happy.
I eliminated the filament dropping resistor and changed the tube layout so it runs on the regular AC line with no dropping resistor. This was accomplished as follows:
Change the 7A8 to a 14B8.
Change the 7B7 to a 14A7.
Change the 7C6 to a 14B6.
Change the 35Z3 to a 35Y4. The 35Y4 has a tapped heater designed for use with a pilot lamp.
Change the 35A5 to a 50A5.
The 14B8, 14A7 and 14B6 tubes have 12.6 volt filaments but are otherwise identical to the tubes they replaced. Likewise, the 50A5 is the 50 volt equivalent of the 35A5.
The radio isn't finished - here is what still needs to be done:
* Acquire a 35Y4 tube and install it in place of the temporary 35Z3.
* Wind a new loop antenna, or come up with a suitable substitute.
* Finish stripping the cabinet, perform needed repairs, and then paint the cabinet in white lacquer. This is a warm weather job, so it will have to wait until spring.
* Paint the replacement pointer white to match the original, broken pointer. Ditto.
You can read all the details on my blog in a few weeks.
This year I picked the chassis of a Philco 41-KR, which uses the same chassis as those tiny five tube Transitone/Philco Transitone models.
Before picture:
After picture:
Before picture, underneath:
After picture, underneath:
I heard it play on Christmas Eve, so I'm happy.
I eliminated the filament dropping resistor and changed the tube layout so it runs on the regular AC line with no dropping resistor. This was accomplished as follows:
Change the 7A8 to a 14B8.
Change the 7B7 to a 14A7.
Change the 7C6 to a 14B6.
Change the 35Z3 to a 35Y4. The 35Y4 has a tapped heater designed for use with a pilot lamp.
Change the 35A5 to a 50A5.
The 14B8, 14A7 and 14B6 tubes have 12.6 volt filaments but are otherwise identical to the tubes they replaced. Likewise, the 50A5 is the 50 volt equivalent of the 35A5.
The radio isn't finished - here is what still needs to be done:
* Acquire a 35Y4 tube and install it in place of the temporary 35Z3.
* Wind a new loop antenna, or come up with a suitable substitute.
* Finish stripping the cabinet, perform needed repairs, and then paint the cabinet in white lacquer. This is a warm weather job, so it will have to wait until spring.
* Paint the replacement pointer white to match the original, broken pointer. Ditto.
You can read all the details on my blog in a few weeks.
--
Ron Ramirez
Ferdinand IN
