I have an old B&K tube Dyna Quik tester Model 550. It tests all the
tubes that I normally use or need and has been reliable.
My question is this. The B&K tester I have is a "Dynamic Mutual
Conductance" tester and some of the (new) tubes I test, do not seem
to measure up using the RED/YELLOW/GREEN scales.
I have always gone by the "go/no go" method using the
RED/YELLOW/GREEN scales and never paid any attention to
the "Micromhos" scale. I recently referred to my old RCA Receiving
tube manual and noticed that each tube in the book has
a "Transconductance" value in micromhos.
I am now debating with myself if I should ignore the colors and
actually start to pay attention to the micromhos scale on the tester.
If this is so, could I use my old RCA receiving tube manual which
gives the Micromhos number for the tubes and compare this published
number with the one on the tube tester meter scale even if it is not
in the green? Is Transconductance the same as Mutual Conductance?
Thanks for any help with this.
K2WH
Bill (Group Owner)