Any help with GE nos 6L6 (7581a) tubes?

[adrianher]

Hi there, I’ve recently bought “2x paired” 6l6 NOS General Electric tubes (7581A) to replace in my Soldano avenger.

The P.V is 472vdc, so making the calculations that bias king manual says I’ve to bias the amp to 31,66 ma (reading of the bias king)

The problem is that I get the followings readings on each tube (from left to right):
32mA, 35mA, 42mA and 27mA.

What do you suggest me to do? Do you think I must return the tubes?

Thanks for help!
Adrian

 

[Jon Snell]

Put the 42 and 27 as one side of the pair and 32 and 35 the other.
The average current will be about equal.

 

[adrianher]

Thx for reply! What about biasing the amp, doing counts Bias king says I should set it at around 31mA. Do I need to turn it down until the 42mA show 31mA?