[TenTec] Century 670 keyer manual / help

[Bwana Bob]

Floyd:

I have a paper copy of the 670 data sheets. I can make a photocopy and 
mail it to you or I could scan it.

If power and output were interchanged, it may only blow Q4, the output 
transistor, a type MPS 6514. Probably any general purpose NPN transistor 
will work as a substitute. The output is an open collector NPN 
transistor, so it will not key negative voltages (i.e.: grid block 
keying) or high positive voltage (cathode keying).


				73,

				Bob WB2VUF

Floyd Rodgers wrote:

> Anyone have one in pdf or scan form? Otherwise, plain old copy will get 
> converted to PDF, once I have it. Basic problem is what dies when the 
> power and output leads get reversed? Thanks
>