[Heathkit] HL-2200/SB-220 questions...

[KHeck73 at aol.com]

In a message dated 12/14/2006 7:30:10 P.M. Eastern Standard Time,  
km1h at jeremy.mv.com writes:

The  chokes serve two purposes.

1. To slightly raise the grid above ground  DC wise by virtue of the 26 Ohms 
resistance and to noticably improve  IMD.
2. To act as a fuse in case of an internal tube arc or  short.



My high school radio club station had a HW-101 feeding a SB-200. I  remember 
on a couple occasions, somebody would try to tune things up with  the HW-101 
set on one band, and the SB-200 on a different band (I didn't do  it!). The 
grid resistors would blow out. I suppose this might have actually  helped protect 
the rest of the amplifier (?). Frustrating, but a resistor is  cheap to 
replace compared to the tubes or whatever else might have  overloaded or arced out.
 
-Karl.