[Amps] Re: AB1 v. AB2

Rich 2@vc.net
Sat, 30 Nov 2002 20:07:45 -0800


>Rich wrote:
>
>> ...
>> >> >> **  so increasing drive will not eventually cause grid current in a 
>well
>> >> >> designed AB1 amp?
>> >> >
>> >> >it can't. If it can then it is an AB2 amp.
>> >> >
>> >> So an AB1 amp can be AB2 if it is overdriven, and an AB2 amp can be an
>> >> AB1 amp if it underdriven?
>> >
>> >Nonsense.
>> >
>> **  please explain
>
>You can build an audio amp or modulator that is capacitively coupled
>to the grids of the output tube and there is nothing you can do to drive
>it into AB2 (grid current). 

How is DC grid bias applied to the grids?

>You have to DC couple it or use a transformer to
>drive it into grid current.
>
>Either the circuit supports AB2 or it doesn't.
>
>            _-_-
>
>>
>> >>
>> >> How would you design an AB1 amp that can not be overdriven?
>> >>
>> >> -  Rich..., 805.386.3734, www.vcnet.com/measures.
>> >
>> >
>> >
>> >
>> >--
>> >  _-_-bearlabs
>> >
>> >   http://www.bearlabsUSA.com
>> >    - Silver Lightning Interconnects & Custom Mods -
>> >
>> >
>> >
>>
>> -  Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
>
>
>--
>  _-_-bearlabs
>
>   http://www.bearlabsUSA.com
>    - Silver Lightning Interconnects & Custom Mods -
>
>
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.