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Nederlands Forum over Oude Radio's |
Re: Philips Radio Set BX760X / BX765X Push-Pull Output stage
Geschreven door John Hupse op 29. Aug 2004 20:13:39:
In reactie op: Philips Radio Set BX760X / BX765X Push-Pull Output stage geschreven door PANDU RAJAN op 29. Aug 2004 19:26:51:
Hello Pandu,
Yes, I agree, valve B6 contains the detection diode, without this important function the sound will be very poor.
The PP output stage will work with only one valve mounted, but with reduced output power. The reason for this behaviour is that both output pentodes work in class AB mode.
A missing B5 however will kill the AVC function, e.g. strong stations will overload the IF amplifier, and the fading compensation will not work anymore.
>>>In BX765X I have noticed that if the valve B5 ( EBL21) is not glowing even then the set is working & there is not much difference in the output performance. But if the valve B6 (EBL21) is not glowing then the performance is very much effected with lot of distortions. Can anyone explain the reason? I know that the detection is through B6 but why the performance is not effected when B5 is not working?