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25 ltd classic mosfet help

1iwilly

Sr. Member
Dec 7, 2008
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ok new project i pick up a 25 ltd classic philly made that has the mosfet mod done some how the tvi slug is missing if i put another in and bring it half would that be acceptable.?? also when checking wattage output using a 1000hz tone about 2 seconds in to the tunning the watts start to fall off like if something was getting hot even when talking the watts drop off is there a biasing resistor to add to the gate of the final to get better output i'm only seen 7 watts on the bird from 2 watts dead key. also a 100ohm resister was added from pin 1 to pin 10 of the audio chip anybody heard of this mod.?? also what diode can i use to replace d-9 ???.thanks
 
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check that out already mod was done the rite way didn't help with problem also what do i replace d-9 with.???

That would be he AMC/modulation limiter.
http://www.cbtricks.com/radios/cobra/25ltd/graphics/cobra_25ltd_block.pdf

The 25LTD uses a 1S2075K diode in all three versions (early, middle, and late) of the schematic available. You did say that it was a Philly; so i would guess it is an early chassis.
Cobra 25LTD

NTE-519 equivalent diode:
http://www.nteinc.com/specs/500to599/pdf/nte519.pdf


CBTricks is your friend . . .
 
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    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
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