For those of you with a Twin Jet...

[leib10]

Where are you running your bias at?

 

[Emg77]

28 ma/mv

 

[Lasse Lammert]

The twin jet has kt88...28ma is way too cold

 

[Emg77]

The twin jet has kt88...28ma is way too cold

Per the User Manuel see below..... And Im digging the tone Im getting..... What would you suggest to bias it to?

"Common or ground plug insert is White color and the four individual tube plug inserts are Blue color. Set your
Multimeter to mV setting, 1mV = 1mA reading. Connect your Multimeters ground test lead to the White/Common
insert and the Multimeters positive test lead to one Blue/Tube insert. Adjust Bias to 25 mA, +/- 2 or 3 mA. Matched
tubes may have +/- 5% tolerances"

 

[leib10]

That's for the EL34 model. For KT88s, 28mA is like 30% dissipation.

 

[Emg77]

That's for the EL34 model. For KT88s, 28mA is like 30% dissipation.

Your right! I called Bogner they said 35ma for the KT88's

 

[leib10]

Wow... even then that's only 40% dissipation. You'd need to run it at 50mA in order to get 60% dissipation, which is average.

 

[glassjaw7]

Wow... even then that's only 40% dissipation. You'd need to run it at 50mA in order to get 60% dissipation, which is average.

Yep, they're probably just recommending 35 so people aren't complaining all over the interwebs of blowing tubes. I'd probably go a bit hotter.