Do I need to Bias?

[Doc58]

I took out my Mullard NOS 5ar4 and installed a JJ GZ34...
BOTH TUBES ARE 5AR4/GZ34'S...
DO I NEED TO RESET THE BIAS?
I think at most I might have changed the Bias by a 1/2 a Milliamp either + or -
I need some opinions...
Tubes were set at 35 ma with the Mullard
Lets hear it?????
I DON'T REALLY WANT TO PULL THE CHASSIS AGAIN!

[eleventeen]

You shouldn't have to. The DC bias voltage is rectified elsewhere, typically by a diode or diodes.

1/2 ma variance? Pfffft. That's nothing.

[HotBluePlates]

If it were my amp, I wouldn't rebias just with swapping a rectifier for another of the same type.