11-02-2014, 09:21 PM
The filaments will run much hotter.
The heat is produced by Vrms, which is 120V in case of the MAINs full power.
The 1/2 wave rectifier produces Vrms=1/2*Vpeak=0.707*120V=85V.
We need 50V.
You still have 35V to drop, or your ilaments will run at almost 3 times (1.7*1.7=2.89) hotter.
Dropping 35V requires 4 times less power to dissipate than 70 (120-50), 10.5W, but still respectabe heat.
The heat is produced by Vrms, which is 120V in case of the MAINs full power.
The 1/2 wave rectifier produces Vrms=1/2*Vpeak=0.707*120V=85V.
We need 50V.
You still have 35V to drop, or your ilaments will run at almost 3 times (1.7*1.7=2.89) hotter.
Dropping 35V requires 4 times less power to dissipate than 70 (120-50), 10.5W, but still respectabe heat.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
