VH4 BIASING

[demiancrew]

HELLO
my name is walter and i'm new on the forum
i write from italyand i have a DIEZEL VH4

I bought a quartet of JJ KT 77 tubes selected for retube my DIEZEL VH4

New valves carry a label that says 61 (I think it is the value of TC )
the old tubes RUBY TUBES EL34 BHT as the value of TC 38
I have a TUBEAMPDOCTOR BIASMASTER BM4.
to set the bias just turn the trimmer until the value of new valves (61)?
can anyone help me solve this problem?
thank you very much
WALTER

 

[Peter Diezel]

I already sent an email. The stickers on the tubes
have nothing to do with the bias current in your amp.
The stickers on the tube is an internal code for the
manufacture. Of course there is a relationship with
the bias current.

Every manufacture is using different voltages to
match the tubes.

YOU CANNOT COMPARE THE STICKERS FROM DIFFERENT MANUFACTURES.

THERE IS NO RELATIONSHIP BETWEEN THE STICKERS AND YOUR BIAS CURRENT

 

[demiancrew]

tank you so much peter

 

[Peter Diezel]