"Ian White, G3SEK" wrote:
>
> 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?
I am not sure about this. 4CX250Bs should be quite indifferent to HV
hum, if screen voltage is well regulated, so I would rather concentrate
on the latter. What do you think?
>
> 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
I will do that, right now.
Many tnx for your help
Angel Vilaseca HB9SLV
> HV rectifiers).
>
> --
> 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.co.uk/g3sek/in-prac
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