[Amps] Grounded B+ amplifier

[tongaloa]

Steve Thompson wrote:

>On Thursday 26 February 2004 17:33, Bill Turner wrote:
>  
>
>>Years ago I recall reading about an amplifier where the B+ supply was
>>grounded and the cathode was "hot" with the B- supply.  I'm wondering if
>>that might have some advantages for high power amplifiers.
>>
>>Specifically, the pi-network output could be simplified by eliminating
>>the plate choke.  Here's how the output would look:
>>
>>http://www.dslextreme.com/users/teeaye/B+.jpg
>>
>>Believe it or not, this is a pi-network output circuit, just redrawn.
>>The same component values would be used as with a conventional circuit.
>>    
>>
>Doesn't it do a lovely job of offering an alternative insight into how a pi 
>network matches between the antenna and plate. The load control is the lower 
>capacitor and provides a variable 'tap' up and down the tuned circuit.
>
>Steve
>_______________________________________________
>
This looks like a nifty alternative for cooling the 2 x gi7b's i've been
scratching possibilites for on paper. Have a big heat sink for SCR's and
with anode grounded can incorpporate it into the rear of the enclosure
making a smaller box than would be required if the thing were kept insulated
from the box.
-bob