[AMPS] Why class B??

[Michael Tope]

Buddy,

If I remember correctly, the HA-10 uses 4 811A's in parallel. I
had one about ten years ago. Worked okay for SSB service, but I had
to watch the drive level from my T4XC, otherwise lotsa splatter. 
Never had it on a scope, so not sure what the IMD was like.

73 de Mike, W4EF/6.............

----------
From: 	Buddy Lumpkin[SMTP:buddyl@wa.net]
Sent: 	Sunday, May 11, 1997 10:34 PM
To: 	Jon Ogden
Cc: 	Lane C. Zeitler; amps@contesting.com; boatanchors@theporch.com
Subject: 	Re: [AMPS] Why class B??


Hmmmmmm,

    I am not familiar with the Heathkit HA-10 Warrior but I would like to add
that if it is using two tubes in Push-Pull class B is exactly how you would like
them to be biased. Then one tube creates one half of the cycle while the othere
takes care of the other half.

    -- Buddy

Jon Ogden wrote:

> >Looking at my old Heathkit HA-10 Warrior I see that the designers set it up
> >to be biased for Class B operation.
> >
> >What are the pros and cons of running class B vice g.g.??
>
> Well, Lane, do you mean class B grid driven?
>
> There are advantages to running grid driven vs. cathode driven (g.g.).
> The grid driven configuration gives quite a bit more gain.  Of course the
> down side is that stability is harder to achieve and one has to have a
> negative bias supply.
>
> Class B operation as others have pointed out is when the tube only
> conducts for 180 degrees of the input cycle (or half).  The advantage to
> class B vs. A is that it is far more efficient.  The advantage over C is
> that it is far more linear.  The difference between class AB and B is not
> all the different.  AB produces a slightly cleaner signal at the expense
> of less efficiency.  Generally, class B is probably sufficient for SSB as
> long as you don't overdrive it very hard.
>
> 73,
>
> Jon
> KE9NA
>
> -------------------------------------
> Jon Ogden
> KE9NA
>
> http://www.qsl.net/ke9na
>
> "A life lived in fear is a life half lived."
>
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