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发表于 2003-9-6 01:19:54
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Biascurrent is about 100mA, output impedance around 120 ohm and amplification for a load of 100/200/600ohm raises to 0.9/1.2/1.6 (depending also on variations in valves). Maximal output voltage with the same loads is 4/7/15V which results in a power of 160/240/375mW, which should be fully in order to drive most earphones. Total gain for both cascodes is 27/36/48. If we include in voltagedivider R1+R2 in our calculations sensivity will be 15/16/20mV/mW. Upper -3dB point is at 150kHz and lower (depending on C5) will be found at 4.5Hz at a load of 100ohm. |
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