Yes - Tre' - Tube DIY Asylum

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Yes

Tre'

In Reply to: RE: New concept using circuit to replace cathode bypass capacitor posted by Eric Chan on April 20, 2024 at 17:44:42:

Only needing 3 volts RMS makes it easy and the CCS presents a very high impedance load for the tube resulting in a horizontal load line. That tube can be operated at a lot of different plate current levels and remain linear because of the horizontal load line.
As long as the spacing between the grid lines is equal, following the load line, then the tube is not producing harmonic distortion.
It's not about the straightness of the grid lines on the plate curves, it's about the spacing between those grid lines following the load line.
You have to plot a load line. If there is no load other than the CCS (as in your first stage) then plotting a load line is easy. It's just a horizontal line with the operating point (voltage and current at idle) sitting right in the middle of it.
The plate load for your second stage is the 220k grid resistor of the next stage. That is in parallel with the impedance of the CCS which is so high of an impedance that you can ignore it.
Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 04/20/24 04/20/24

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Follow Ups Full Thread

Topic - New concept using circuit to replace cathode bypass capacitor - Eric Chan 22:16:31 04/17/24 (11)

RE: New concept using circuit to replace cathode bypass capacitor - Vatron 18:51:18 04/18/24 (8)

RE: New concept using circuit to replace cathode bypass capacitor - Eric Chan 08:34:29 04/20/24 (3)

RE: New concept using circuit to replace cathode bypass capacitor - Tre' 14:31:54 04/20/24 (2)

RE: New concept using circuit to replace cathode bypass capacitor - Eric Chan 17:44:42 04/20/24 (1)

Yes - Tre' 19:00:56 04/20/24 (0)

Agree - Triode_Kingdom 20:48:58 04/18/24 (3)

RE: Agree - ivan_terrible 22:58:19 04/21/24 (2)

RE: Agree - Triode_Kingdom 23:46:19 04/21/24 (1)

RE: Agree - ivan_terrible 02:25:42 04/22/24 (0)

Why not just use the standard 10M45S CCS on a chip? - Chip647 06:17:24 04/18/24 (1)

RE: Why not just use the standard 10M45S CCS on a chip? - Eric Chan 08:45:30 04/20/24 (0)

Follow Ups

Yes - Tre' 19:00:56 04/20/24 (0)

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