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

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]

---

[ Alert Moderator ]

---

RE: Q:DN2540 CCS protection diodes

Posted by Tre' (P) on January 6, 2017 at 08:02:41

In Reply to: RE: Q:DN2540 CCS protection diodes posted by Michael Samra on January 6, 2017 at 00:29:38:

The current through the circuit is set by the CCS, not the tube.

I build and set the current of my CCS on the bench with a low voltage bench supply and a 100 ohm resistor in place of the tube before I install them.

Once installed, even though there is now a tube and a lot more voltage, the current is always the same as it was when I set it.

That proves that the CCS is working.

The only thing that will change when you sub in a different tube (of the same type) with different transconductance (do to age or condition) is the voltage at the plate.

If you want a certain voltage at the plate you don't change the current through the circuit, you change the bias condition of the tube by changing the value of it's cathode resistor. When you do, the current through the circuit stays the same.

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

Edits: 01/06/17

This post is made possible by the generous support of people like you and our sponsors:

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---