[Boatanchors] AF-67 22.5 Volt Battery Replacement

[WA5CAB at cs.com]

Bill,

Sandy mentioned using partially discharged 9 volt batteries (which BTW are 
not fully discharged until the terminal voltage hits 4.5 volts, same as 
LeClanche).  You can also turn new 9 volt units into 6 volt ones suitable for bias (no 
appreciable current) applications by opening the bottom crimp and removing 
and reversing any one of the six cells.  Close the crimp and mark it 6V on both 
sides.  Connectors are readily available, and plus two unmodified ones would 
get you 24 volts.  Or alternatively but a little more trouble would be to 
replace three of the cells with brass rod, mark it 4.5 V plus two unmodified units 
makes exactly 22.5 volts.  I used the former method to replace the -4.5 volt 
portions of the BA-41 in BC-620/659 after confiming that the audio stage was 
happy with even 7 volts on the bias line.

In a message dated 1/14/2005 9:19:09 AM Central Standard Time, 
bstewart at ipass.net writes: 
> Does anyone know where I could find info on a circuit to replace the 22.5 
> volt battery in the AF-67?
> These batteries are getting expensive.....thanks...Bill K4JYS

Robert Downs - Houston
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