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Remove cover.


 Between PA load shaft, PA tune shaft, is a large metal box with holes on top.


 The ones marked 28.5 & CB are tunable/


 To extend the range even more add to or remove C1605 for  28.5 or C1601 for CB.


 Try using a SPST switch on CB cap C1601 to extend up to 28 mhz & below 27 mhz.




 This is per "Ultimate Modifications Bible IV"




 



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