[Amps] filament voltage

[Ron Youvan]

> When the data sheet specifies 13.5 +- 0.6 V, such as with the 3cx800A7, 
> are they referring to a DC voltage?  So, if I have 13.5 VAC, 
> the RMS value, it would be just dandy, or are they referring that 
> 13.5 V is the maximum peak value?

   The way I understand it, RMS is the a.c. Voltage that is the equivalent heating capability to the 
direct current Voltage,  So. 10 Volts RMS will heat a filament to the same temperature as 10.0 Volts 
d.c.
-- 
    Ron  KA4INM - Remember, the government cannot give anything to anyone
                   that they have not first taken away from someone else.  (like you and me)