[AMPS] Why class B??

[Jon Ogden]

>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."


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm