[Boatanchors] OA2 PROBLEMS SOLVED

[Jim Wilhite]

So Bill, could you be inferring that all modifications are not 
necessarily good modifications?

Congratulations on your work.

73

Jim/W5JO


----- Original Message ----- 



> In an earlier post I had indicated a problem with a power supply 
> where OA2
> tubes appeared to be drawing too much current.  I received a 
> number of
> responses which helped me solve the problem, and I once again 
> thank all who
> provided me with guidance.
>
> It would appear that the transmitter had had several modifications 
> installed
> which changed the current requirements on the regulated lines. 
> The series
> dropping resistors to the OA2s, however, were not changed to 
> reflect the
> change in current requirement, and so each OA2 was pulling close 
> to 45 ma
> unloaded and some 35 ma loaded.  The series resistors have now 
> been changed
> so that each VR tube pulls 25 ma in standby and 30 ma under load.
> Everything appears to be running cooler as well.
>
> 73, Bill VE3NH
>
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