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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Voltage drop posted by Davey on January 16, 2023 at 06:43:40:
Is that a lot also depends on in what the fuse is being used.
In the case I measured, the amp was a zero feedback tube amp with a rather large filament circuit (about 19 Amps). Because there's no correction, yes, changes in line voltage most definitely affect it (not only does the plate voltage go down but the tubes cool off a little as well)! To measure the effect on such an amp, measure output power, distortion and output impedance. With greater voltage drop, the output power decreases and the other two metrics increase.
WRT fuse direction, that is so much poppycock. What is happening is the fuse isn't perfectly symmetrical and can get a better connection in the fuse holder one way or the other, so less voltage drop. For this reason people wind up thinking they are directional, which obviously is impossible.
You can get the same effect by rotating the fuse in its holder without reversing it; measure for the least voltage drop.
We make a class D amp that employs quite a lot of feedback and as a result of the rejection offered by that feedback, does not seem to respond to fuses at all.
The takeaway is the current draw, the kind of load and what feedback is present all play a role.
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Follow Ups
- RE: Voltage drop, but there's something you're not getting - Ralph 11:42:55 01/20/23 (2)
- RE: Voltage drop, but there's something you're not getting - Davey 18:17:07 01/20/23 (1)
- You're right; my apologies nt - Ralph 10:22:08 01/23/23 (0)
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