|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
50.151.166.185
In Reply to: RE: Pentode/Triode Operating Points (6BL8,6U8,6GH8,7199 etc) posted by FlaCharlie on August 30, 2016 at 11:00:38
That's not uncommon. The Cit II uses a higher screen supply on the 12BY7A pentodes as well.
Follow Ups:
So does anyone have any suggestions for circuits / operating points for the 7199 alternatives I mentioned?
I recall reading a comment that the triode section of the 6BL8 is similar to the triode section of the 7199 which inferred that no change would be necessary for that section. What about the pentode section?
If you converted from 7199 to one of the alternatives did you just drop it in (either with an adaptor or by rewiring the socket, of course) and hope for the best or make changes?
In the Mullard 3-3, the anode of the EF86 is direct coupled to the grid of the power tube, and the screen is connected to the power tube's cathode. So, the anode must be less positive than the screen. Mullard says +20V anode and +28V screen.
--------------------------
Buy Chinese. Bury freedom.
While not perfectly independent of plate to cathode potential, the g2 to cathode potential in combination with the g1 to cathode potential is what primarily determines the plate current in pentodes.
Eli D.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: