Biasing question?

[nivek]

I just changed tubes in my Einstien, JJ KT-77s in the inners and winged C EL-34s in the outters, can someone please give me the correct bias for each? Also has anyone else tried this combination and if so what was the result? Thanks Kevin

 

[reussen]

Haven't tried the combination, so please let me know how it works out! Biassing KT77's is (as far as I know) the same as EL34. Diezel website (Tech Corner) states biassing between 60 and 70 mA.

Rock on!

 

[nivek]

I am really enjoying the new tubes, I already loved the sound of the winged-Cs and the KT-77 add more punch and authority. Suites my style just right.

 

[Duolos]

Please Bias to 65mA

 

[nivek]

I am running the KT-77s at 85ma and the winged C EL-34s at 73ma besides shortning the tube life is there any other negetive effects of running the bias hotter than the recommended ma?

 

[Duolos]

I am running the KT-77s at 85ma and the winged C EL-34s at 73ma besides shortning the tube life is there any other negetive effects of running the bias hotter than the recommended ma?

Other then damaging your amp I can't think of any...

You are WAY too hot.

 

[wolfeman28]

The SEDs can usually handle a bit hotter bias, but I wouldn't push the KT-77s that hard...