[Drake] 6146 PA Neutralization

Thu, 18 Dec 2003 20:14:03 +0000

   Hello Dan, yes, it might be possible to do some changes to accomodate 
neutralization things for the new tubes;  I've been using a method for 
neutralizing that only removes screen voltage, not anode voltage, then 
tuning plate and load controls for maximum output into dummy load (as 
seen on oscilloscope) and then for minimum as possible RF out with the 
neutralizing trimmer,  with good results.

Good luck
Guillermo - LU8EYW.

Dan W. Dooley wrote:

>Anyone have any suggestions as to the best way to neutralize the PA of a
>Drake T-4XB that has been converted to 6146s?  The initial instructions I
>have said to use the normal Drake manual procedure.  I believe I have seen
>information implying that some changes may be needed to the circuitry to
>accommodate the neutralization needs of the new tubes.
>
>Also, the 6JB6s could be neutralized by removing the plate and screen grid
>voltage and tuning the neutralizing control for minimum output.  Does that
>method apply to the 6146s as well?
>
>Dan W. Dooley WB5TKA
> email: [email protected]
> http://www.dooleystreasurechest.com
>
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