04-07-2013, 07:49 PM
More news: the replacement speaker I have has the field coil resistance about 500 Ohm. The required resistance is 1,700 Ohm.
As a minimum this means higher B+ voltage on my tubes which coupled with already high compared to the old standard Mains voltage may stress the tubes unnecessarily.
Of course I can insert the resistor. But I am not sure what current this coil was designed to work with, so not sure how well it is going to work being the field coil. Obviously it works somehow, given the fact that this radio worked at some point with this speaker, but how well....
As a minimum this means higher B+ voltage on my tubes which coupled with already high compared to the old standard Mains voltage may stress the tubes unnecessarily.
Of course I can insert the resistor. But I am not sure what current this coil was designed to work with, so not sure how well it is going to work being the field coil. Obviously it works somehow, given the fact that this radio worked at some point with this speaker, but how well....
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
