View Single Post
  #4   Report Post  
Posted to rec.audio.tubes
Ian Iveson Ian Iveson is offline
external usenet poster
 
Posts: 960
Default Recommendatons bias settings for KT88 and KT90

Wessel wrote

Also, what is a good value of grid leak resistance for these? I am
using 220K for 2 EL-34's in parallel. Can I raise this for KT88/90?


Hi Wessel

Datasheets generally give a value for max grid leak. e.g.

http://www.tubezone.net/pdf/kt88new.pdf

Note at least two values are usually given for max R(g1-k), one for
cathode bias, the other for fixed.

Mode makes no difference, AFAIK. I see that datasheet has different
values depending on total (anode + screen) power dissipation. That's a
bit interesting...it's quite a big difference.

Ian