This is NOT about critical inductance values, but rather the maximum inductance for an input choke.
In the book "Vacuum Tube Rectifiers" by A. Schure, an example is shown using a 20 Henry choke in
a choke input PSU.
Another example is the DHTRob blog where a 25 Henry choke is used.
The odd thing is, all rectifier data sheets I have come across so far has a maximum choke value of 10 Henries
when used as an input choke for a PSU.
What's going on here?
In the book "Vacuum Tube Rectifiers" by A. Schure, an example is shown using a 20 Henry choke in
a choke input PSU.
Another example is the DHTRob blog where a 25 Henry choke is used.
The odd thing is, all rectifier data sheets I have come across so far has a maximum choke value of 10 Henries
when used as an input choke for a PSU.
What's going on here?
Where did you get that from ?
The data sheets I know of clearly show the 10 Hy under the headline "Typical Conditions", not max.
e.g. 5U4GB (see attachment):
it just says that if you use plate supply 550V RMS and Choke 10H and DC current 275mA then you get a DC output voltage of 420V.
Call it an example if you wish, but there is no max for filter inductance.
More choke, and you get less output voltage for the same load current and input voltage (and lower ripple).
Less load current, and you get higher output voltage for the same choke. ... a.s.o....
The data sheets I know of clearly show the 10 Hy under the headline "Typical Conditions", not max.
e.g. 5U4GB (see attachment):
it just says that if you use plate supply 550V RMS and Choke 10H and DC current 275mA then you get a DC output voltage of 420V.
Call it an example if you wish, but there is no max for filter inductance.
More choke, and you get less output voltage for the same load current and input voltage (and lower ripple).
Less load current, and you get higher output voltage for the same choke. ... a.s.o....
