01-21-2014, 11:37 PM
Look how many wires coming out of either electrolytic.
Typically these radios will have a filter with the first cap after 25Z5 being 20-40uF and the second will be after the field coil about 20uF.
There might be another one, possibly, this is why we need to know how many wires and where they come to. The working voltage for either one should be about 150V (can be more but not necessary and in fact can be less). Those are half-wave rectifiers so they will drop the Mains voltage.
One more thing: as you have no experience in electronics, I have to honestlyh warn you an AA5 radio is not at all a good beginners' project as they have hot chassis and a hot chassis can, well, bite.
!!!!!!!!!! If you want to do it!!!!!!!!!!
1. Don't do it in a basement in concrete floor.
2. BUY AN ISOLATION TRANSFORMER and only plug this radio through it while working on it.
3. Check your newly bought isolation transformer for being a true isolation one, taht is its outputs NOT referenced to Earth.
Typically these radios will have a filter with the first cap after 25Z5 being 20-40uF and the second will be after the field coil about 20uF.
There might be another one, possibly, this is why we need to know how many wires and where they come to. The working voltage for either one should be about 150V (can be more but not necessary and in fact can be less). Those are half-wave rectifiers so they will drop the Mains voltage.
One more thing: as you have no experience in electronics, I have to honestlyh warn you an AA5 radio is not at all a good beginners' project as they have hot chassis and a hot chassis can, well, bite.
!!!!!!!!!! If you want to do it!!!!!!!!!!
1. Don't do it in a basement in concrete floor.
2. BUY AN ISOLATION TRANSFORMER and only plug this radio through it while working on it.
3. Check your newly bought isolation transformer for being a true isolation one, taht is its outputs NOT referenced to Earth.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
