Cap max value after 6X5GT/EZ35 rectifier?

[reaction]

I am little bit confused - checked out 10 technical sheets and the max value of the cap just after the rectifier tube varies - 4/10/16uF!

Does anybody know which value is safe for this type of tube? Can I use 16uF without shortening it's life?

 

[fdegrove]

Hi,

16µF max. capacitance with 70mA drawn.
Use of a set of 350 Ohm surge limiting resistors is recommended.

Cheers, 😉

 

[reaction]

Is there any relation between the maximum cap value and the maximum current drawn? Does it mean I can use safely 50uF for example with 20mA current?

cheers

 

[fdegrove]

Hi,

Is there any relation between the maximum cap value and the maximum current drawn?

Yes.

But it's not linear meaning that can't just put twice as big a cap if you're only drawing half of the maximum current specified, for instance.

Does it mean I can use safely 50uF for example with 20mA current?

I doubt it.

Cheers, 😉

 

[ari polisois]

Frank,
As per FDGroove, you should have that resistance.
This includes the transformer's secondary winding.
Cheers,

 

[Tom Bavis]

The important thing is not to exceed the tube's peak current rating, as it will be likely to arc. Use the free PSU designer program from Duncanamps.com to see what the peak current will be - depends mainly on load, first capacitor value and transformer primary and secondary resistance.