[Boatanchors] [Milsurplus] OK Smart People- Back Bias

[WA5CAB at cs.com]

So long as you are only using it for grid bias, you can turn a 9V battery 
into a 6V one by opening up the bottom, turning one of the cells over, and 
re-sealing it.  Or you can make a 7.5V by replacing any cell with a length of 
brass rod.  You'll need to insulate the rod with shrink tubing.

In a message dated 07/31/2012 12:09:44 PM Central Daylight Time, 
w7qho at aol.com writes: 
> Might  "work" in the sense that you'll hear something but won't  
> provide the required negative bias voltages.  Quick and dirty, would  
> recommend stacking up 5 AA cells to give you -7.5 volts bias for the  
> 1D8 grid and the AVC circuits.  Single 9 volt battery might work OK too.
> 
> Dennis D.  W7QHO
> Glendale, CA
> 
> ************
> On Jul 31, 2012, at 8:51 AM, David Stinson wrote:
> 
> >I'd like to make a temporary "tacked-in" change so I can
> >use a supply with B- grounded for a short time.
> >Will 5-volt zeners connected this way work?
> >
> >http://home.netcom.com/~arc5/bias/zenerbias.jpg
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480