[R-390] Fw: in rush

[Bernie Doran]

> This is what I have been doing for years on all of the old gear, a 
> properly selected thermistor followed by a ten watt wire wound resistor, 
> Ohm value selected to drop the high line voltages to a bit about the 
> minimum voltage as measured at the tube filaments, usually around five to 
> ten Ohms, then following the resister is an MOV.  The incoming service to 
> the home also has a huge MOV on the line to a ground that is less than one 
> Ohm.    This has worked very well for years and to me the concept of a 
> fire hazard is absurd. The only time that a thermistor is not the proper 
> choice is where the item is turned on and off frequently without giving 
> the thermistor a long enough time to cool off, and even this would have no 
> effect on a receiver as the tubes would also still be warm and under the 
> worst case would be no worse than the operation without the thermistor. 
> Dumping power on a large plate transformer "might" benefit from a step 
> start, that is what I use on the Gates BC1G. I think large thermistors 
> would work better there, and get rid of extra plate relays, large 
> resistors, and the time time delay relay. And again these are my 
> additions, Gates did not install any step start originally.   If you are 
> running a high power solid state rig with huge capacitor input filtering, 
> then probably step start or switching between two thermistors would be 
> likely necessary.  These critters are very inexpensive and can be 
> connected in series or parallel as needed. What is not like?
>
>