Angel Vilaseca wrote:
I am building a 2500 V power supply for a one-KW transmitter. It will
use 2 4CX20Bs.
I have two oil-filled capacitors: 2.5 KV 40 uF and a 4 KV 25 uF.
I feel quite uncomfortable using the 40 uF 2.5 Kv one, because it would
work very close to its voltage limit.
On the other hand, the 4 KV 25 uF would be OK as far as voltage is
concerned, but would not 25 uF be too low?
I'd agree with Steve - use the 25uF, since this is a low-current supply
by most people's standards on this list.
Is there a rule of thumb ? How low can you get away with capacitance
in a HV power supply feeding two tetrodes?
The really isn't a rule of thumb - it's more a question of: how many
percent of 100Hz AM are you prepared to tolerate?
If you really, really want to know how the 25uF capacitor will perform,
then download Duncan Munro's "PSU Designer" software (go via my 'In
Practice' page, URL below, and also pick up the data file that supports
HV rectifiers).
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek/in-prac
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|