[Amps] HV resistor source

[KA4INM]

On 04/17/13 00:06, Drax Felton wrote:

> So then what is the Radio Handbook talking about where it uses a 10ohm/20w
> one between the plate choke and the +HV?

> From: Jim Garland [mailto:4cx250b at miamioh.edu]

> That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm
> resistor amounts to a half million watts of dissipation!  A 4KV pulse 50uS
> wide, once per second, would dissipate 25W.

> So where does one find a 30 to 50 ohm 25 watt resistor that can safely
> handle 4000v?

   The 4,000 Volt rating is not across it, it is from the resistor to 
ground through the mounting hardware.  (in this case)
If an arc occurs in the tube (for instance) there will not be 4,000 
Volts from the power supply.  (for long)
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.