805 cathode follower direct coupling power amplifier circuit

Published:2011/10/24 2:15:00 Author:May | Keyword: cathode follower, direct coupling, power amplifier | From:SeekIC

The practical situation is: due to the push tube's cathode minimum voltage is 0V, the practical 805 grid push range only has 0V~45V, at this time, in theoperating point namely the small triangle area, output power P0'=0.5(1425-1050)/(100-55)*1000 = 8.5W. This is the biggest shortcoming of this type circuit. For low sensitivity sound box, it will lead to clipping distortion to turn the volume up. It is clearly that it can negligent if you never turn up so big volume. But if it only outputs 8.5W, the operating factor is so low. And the better choice is to adopt 300B. It is hard to achieve without minus gate voltage part if you want to get higher output power.



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