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In Reply to: RE: Would you mind... posted by timp on September 17, 2012 at 20:50:48
If you are dissipating 13 watts, wether you use a resistor rated for 25 watts or one rated for 50 watts you are going to create 13 watts of heat. The difference is in the area used to dissipate that heat, correct? In the case of a larger resistor, the heat is spread over a larger area.
I'm guessing that if no air flow is provided, given enough time the 50 watt resistor will get as hot as the 25 watt resistor (asuuming the same power).
I've been amazed at the small size of modern Kiwame 2 watt carbon film resistors, as compared to the carbon resistors of 30 years ago with the same power rating. But these little buggers get HOT!! No touchy.
Follow Ups:
Same with mills mra. Especially NI resistors due to the construction.
cook an egg.
Without calculating the ambient temp. into the actual heat dissipated, they can and will get very hot. Not had one fail yet though.
FWIW, I kinda got away from the finger tests for heat.
My preferred method is a contact probe.:-)) It doesn't blister.
Love your sense of humor!
S.E. amps have no common-mode rejection, so any distortions introduced into their simple circuit gets amplified.
The reason a good one sounds so good is that the builder has learned to minimize adding distortions into the circuit, and the fact that since S.E. can't reject common-mode, it also can't reject parts of music.
Aluminum on aluminum isn't so bad-- that's OK, the resistance will generate heat and some magnetism when current flows thru the resistive element.
It's better to isolate this as best you can.
---Dennis---
The reason a good one sounds so good is that the builder has learned to minimize adding distortions into the circuit, and the fact that since S.E. can't reject common-mode, it also can't reject parts of music.
....Would the "part of the music it can't reject" stated above be mains ripple or mains x2 ripple depending upon the rectifier used when NOT utilizing critical L?
What has the builder implemented that minimizes the added distortions?
Proper tube topology > finals? Avoiding Miller C, A/C filament supplies away - far and away....
Keeping in line with a good sense of humor, analogously, I sound better in the AM because of 8oz's of Prune Juice at bedtime.
Cheers,
W
"the fact that since S.E. can't reject common-mode, it also can't reject parts of music."
Can you explain what this means? Failure to reject common mode power supply noise is no guarantee of amplifier fidelity.
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Buy Chinese. Bury freedom.
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