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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Because in my own extensive tests, it lost information... posted by Allen Wright on March 18, 2007 at 04:34:26:
And might I add that it was most probable that was due to the very high impedance of the screen supply. Once a person has heard a pentode with a well made and low impedance G2 supply there is no going back IMHO.I know you are very familiar with the asymmetrical plate impedance of tubes in respect to their plate current. While a normal tube's ( 300B in my example ) plate impedance might swing from 250 ohms near Vg1 = 0, up to 2000 ohms at twice the quiescent Vg1 point. The pentode's G2 impedance under goes an even more radical impedance swing which can be from a few thousand ohms to several Meg ohms. IMO, this is what causes a lot of the screen current non-linearity. However, a low impedance G2 supply greatly reduces the non-linearity and regains the lost transparency and detail.
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Follow Ups
- I totally agree. "it lost information" - JLH 07:03:35 03/19/07 (3)
- Excellent JLH !! (nt) - drlowmu 11:08:44 03/19/07 (2)
- Re: Excellent JLH !! (nt) - Ray Moth 19:17:52 03/19/07 (0)
- Re: Excellent JLH !! (nt) - Ray Moth 19:15:04 03/19/07 (0)
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