|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: Answer from the peanut gallery posted by Ray Moth on August 11, 2012 at 17:09:23:
Ray,You posted this :
G2 needs a low impedance supply, as well as a fixed voltage supply. That's especially true for Class AB1 PP pentodes, because G2 current demand can vary greatly from quiet to loud music passages - as much as 500%. That's why either very low DCR supplies or series regulation supplies have often been used for G2 (shunt regulation is not really practical with such great variation of current demand).
------------------------
Your contribution was excellent. When I look up GE 6550A tube data sheets, I read (as AB1 P-P for two tubes, 450 VDC P-K), the following specs:
G2 at idle current , 9 mA.
G2 at max power , 38 mA.So yes, that is over a 400 percent change. NO WONDER low DCR G2 supplies made a difference in stable G2 operation. Its not just a change from 1 mA. to 5 mA.
As a result of your post, I am now also viewing 500% changes in G2 current, with PSUD2 sims.
No longer only 3 mA. to 3.45 mA., or a 15% delta I.
Thanks Ray.
Jeff Medwin
Edits: 08/15/12
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- G2 , wide current changes ..... - drlowmu 09:18:18 08/15/12 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
