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发表于 2014-8-22 13:45:16
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本帖最后由 Zjokers 于 2014-8-22 13:49 编辑
我去问cary的回信
Greetings from Cary Audio,
Generally, low level hum in the output of this amp is due to filaments. You can check the A.C. component of the filament supply to see if you are getting adequate filtering. I typically will measure about 200 to 300 mV of A.C. across the filament supply. I also have found that a judicious choice of 300B tubes will
make a difference as well. If you have other tubes try those to see if you might have a quieter pair. Hope this helps.
说是两个问题 1.灯丝不行,换个低噪电子管的会好些
2.检查灯丝的交流电是否有效经过过滤
越贵的管子低噪越小吗?,求指教~~
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