[Amps] Step Start on a 3KA Amp

[Vic K2VCO]

Bob Maser wrote:
> Can anyone tell me what good is it to have one of those cone heaters in 
> series with the primary of the plate transformer?  When the cone heater is 
> in the circuit, the secondary voltage is 2800VDC and when it is shorted out, 
> it is 3000VDC.  Hardly seems worth the effort.  The cold resistance of the 
> cone is ±30 ohms.

The current drawn during the period that the filter capacitors initially 
charge is huge and this resistance limits the current during this time. 
  If you are looking at the voltage drop without load, obviously you are 
missing this!
-- 
73
Vic, K2VCO
Fresno, CA
http://www.qsl.net/k2vco