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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Thank you! And cap questions? posted by immatthewj on July 28, 2020 at 11:48:52:
Excessive current.
Here's my non-technical explanation as it is the only one I have. AA members may chime in if my "gist" of it is way off.
To provide current to a tube there is a circuit. Practically the whole amp really. In this circuit you have a power supply, capacitors, resistors, diodes, etc, including the tube itself. A circuit by definition means everything is connected forming a proverbial circle.
Once the circuit is set up, current will flow steadily within the designed theoretical range. The job of the trim pot is to finely tune the current to run at an ideal value or bias point for everything to work as intended.
In the scheme of things, the trim pot has no idea what it is adjusting. It's job is just to add more or less resistance.
If something goes "amiss" in the circuit, the trim pot can only control so much. Remember it is for fine tuning only.
Unlike a fuse that blows under duress, the "amiss" circuit will still operate at less than ideal conditions. A bad resistor will sill operate, but not at it's intended value. A bad cap may be allowing DC to pass through. A broken connection in one part of the circuit will cause the other parts to either shut down or now behave differently.
The tube unfortunately suffers because it keeps doing what it supposed to, but now sendly over double the electrons it should be to the anode plate, causing it to get extremely hot or red plate.
I may have gotten carried away with this answer. Hope it explains what you asked. Otherwise, no worries, ask again.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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Follow Ups
- RE: Thank you! And cap questions? - Jonesy 14:44:08 07/28/20 (0)
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