[sdiy] Tube amp problem

[René Schmitz]

At 10:23 06.05.02 -0700, eric b wrote:

>Their circuit will come close to 15W. Just a few
>issues--mostly with tube quality, not their circuit...
>I do not think parafeed will not improve efficiency--
>only distortion, by preventing output transformer
>saturation.

If parafeed with a choke, then sure. (But then you'd need a 
choke which can handle that much DC....) 

For the the proposed RC coupled circuit (which I mistook for parafeed), 
you need a higher supply voltage to get back to the same quiescent 
point, and the transformer is parallel (for AC) with the load, so 
consumes a fraction of the output power which will not be delivered 
into the load, and diminishes the efficiency. 

There is an interesting discussion on these different topologies at 
Steve Bench's Homepage http://members.aol.com/sbench101/
The discussion is here: http://members.aol.com/sbench/outstru.html

Cheers,
 René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159