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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: The nominal power for F12N field coil is 25 W. posted by sser2 on July 11, 2007 at 17:53:25:
I was speaking from my personal experience. As I said, 25 W on F12N makes field coil barely warm to touch. The limiting factor is temperature rating of magnet wire used in the field coil. Antique wire was rated at least 100 degrees C. Transformers of that time were rated to run continuously at 80 C body temperature. There is no reason why field coil should be rated differently.
At 30 W, F12N coil heats to 50-55 C.
To run it at 40 W, the winding should be impregnated with silicon oil, and ~1000 cm2 heat sink added to the yoke. The temperature reaches 65-70 C, which is normal.
Needless to say the driver should not be placed in any kind of box. It should be on an open baffle with free air circulation.
Factory FC ratings were veeeery conservative, and for driver inside wooden cabinet with a lot of heat from tubes, with ambient temperature reaching 70 C...
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Follow Ups
- Wow - I stand corrected! - sser2 13:05:01 07/12/07 (4)
- RE: Wow - I stand corrected! - Steve Schell 14:06:05 07/12/07 (3)
- RE: Wow - I stand corrected! - John Sheerin 15:58:27 07/12/07 (2)
- RE: Wow - I stand corrected! - Steve Schell 20:43:10 07/12/07 (1)
- RE: Wow - I stand corrected! - amnesiac 23:33:37 07/12/07 (0)
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