[Amps] 3-400

[Gudguyham at aol.com]

In a message dated 1/31/2008 8:53:41 P.M. Eastern Standard Time,  
n5tog at bellsouth.net writes:

Hello i  have a swan amp with 2 3-400 the swan  manial say to load it to 500 
to  600 mills  on the grid, i checked the internet and my manual is like the  
others on the net , the bill orr handbook say 142 mills oer tube can some one  
tell me if the swan manual is right or what? i just can not believe that the  
swan  manual  500 to 600 mills can be right  can some one help  hear.. Thanks 
 Harold  n5tog
_______________________________________________



Indeed Harold, the manual DOES state that the grid current could be between  
500 and 600, it is NOT a misprint, Even the Swan Mark I  and Mark II amp  
manuals say the same.  That is a bit high for sure.  I would not worry  if the 
grid current reached 400ma for a pair of tubes, but at that point you are  going 
non linear,  Load the amp a bit heavy to reduce the grid  current.  Lou



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