BK 600 test results Interpretation

[Westy56]

The kt88's and the 6550 all test "90" on this emissions tester. The meter dial goes to 120%

Does this tester give any reliable way to gauge the tubes life expectancy or strength?

Steve

 

[cademan]

As long as the needle is in the green, they're good. The expectancy depends on what they're being used in, and how hard they are being driven. If you really want to be sure, just send them to me!

 

[Tom Bavis]

Turn the heater voltage down to 5V while testing - if the reading drops 25% or more, that may indicate that there's not much life left. Just a rule of thumb, and may vary by tube type - haven't tested a 6550 or KT-88 on my B&K...

 

[Westy56]

Turn the heater voltage down to 5V while testing - if the reading drops 25% or more, that may indicate that there's not much life left. Just a rule of thumb, and may vary by tube type - haven't tested a 6550 or KT-88 on my B&K...

I'm going to test some new tubes (6550,kt88) and compare results with the mullards.
I wanted to check these on a mutual conductance tester, but it didn't have the charts.

This will be my first tube roll..Any suggestions on a good 12by7a for my driver stage?


Steve