75% of rated max. current too high?

[bequerel]

I am working on a tube preamp. I really love the AZ1 rectifier tube. This has a rated max. current of 100 mA.
Would you consider a constant load of 75 mA to be too high (i.e. excessive tube wear)?

 

[Alain Dupont]

bequerel,

Looking at the docs... Philips AZ1 - 1953

http://www.mif.pg.gda.pl/cgi-bin/vs4.pl

2*300volts 100mA
2*400Volts 75 mA
2*500Volts 60mA

In the case of <=300Volts 75mA is correct.

Regards.

 

[bequerel]

Thanks a lot, Alain! I was not aware of that the max. current was dependent on the voltage. (The link does not work, by the way.)

 

[Alain Dupont]

bequerel,

The right link is:

http://www.mif.pg.gda.pl/homepages/frank/vs.html

search for AZ1

Regards.

Alain.

 

[bequerel]

Thanks, that works.🙂