[Hallicrafters] SP44/S40A advice please

[Chuck McGregor]

At 07:45 PM 3/2/2006, Julian Bunn wrote:

>I'd like some advice on connecting an SP44 to an S40A. Both devices work 
>well independently,
>and are carefully aligned. But when I attach the SP44 coax lead between 
>Pin 3 (the plate) of
>the S40A's V2 (6SA7) and ground, it kills the performance of the S40A 
>almost completely ... although
>I can still tune some very strong signals, and pips appear on the SP44 and 
>move as I tune the
>S40A.

Julian-
There is supposed to be a 50Kohm 1/2 watt isolation resistor between the 
end of the cable center conductor and the plate of the S40 
mixer.  Originally, that resistor at the end of the cable  was covered by a 
brass shield, as shown in the manual.  If the cable was cut short, that 
changes the capacitive loading on the SP44 input transformer and you will 
need to realign it.

--Chuck N7RHU 


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