I have uploaded the schematic and some of the recent threads about the 
10544 at

"http://www.ko4bb.com/ham_radio/Manuals/HP - 10544/"

Didier KO4BB

Howard W. Ashcraft wrote:
> One difference between the 10544A and a 10811A is that the 10544A requires 
> +12v on pin 8 in order for the heater to turn on.  Without this signal, the 
> heater will appear to be dead, even with the proper voltages on the heater 
> pins.  So, you may have difficulty using a 10544A as a direct replacement for 
> a 10811A.  I have also had difficulty finding specific information on the 
> 10544A, but other have graciously offered a 10544A schematic, which I have, 
> and could forward to you if you would like it.
>
>   


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