[Amps] Re: AB1 v. AB2

[bearlabs]

----- Original Message -----
From: Rich <2@vc.net>
To: <bearlabs@netzero.net>; AMPS <amps@contesting.com>
Sent: Saturday, November 30, 2002 11:07 PM
Subject: Re: [Amps] Re: AB1 v. AB2


>
>
> >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?

Separate minus voltage power supply fed via high impedance (resistors) to
prevent loading down the drive voltage...

>
> >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.
>
>


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