|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
|
|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: What actually happens when a tube wears out? posted by tantra on April 3, 2007 at 16:23:34:
The coating on the cathode begins loosing its ability to produce a sufficient quantity of electrons. Simple tube testers perform an emission check. If emission is too low, the tube is BAD.Another thing declines with age is transconductance (gm). When gm falls below a certain level, circuit performance is adversely impacted. It's possible for emission to be OK, but gm unsatisfactory. That's why better tube testers check both emission and gm. BTW, gm does not apply to diodes.
Yet another sort of failure is the development of inter-electrode short circuits. Heater to cathode shorts are fairly common.
Eli D.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: What actually happens when a tube wears out? - Eli Duttman 17:30:55 04/03/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
