Cobra 25LTD Classic

[Smokinone]

No, I saw it too as I compared the old vs new cap position you pointed to.

C91 as far as I can tell, will have to research it more when I get the radio back. Won't be the first time the board was marked different than the position.

 

[Cable Guy]

C91 as far as I can tell, will have to research it more when I get the radio back. Won't be the first time the board was marked different than the position.

When I recap, I usually follow the orientation of the old cap, I have seen too many incorrect silkscreen polarities. Sometimes I forget the orientation and reference the silk, but always write it down so if something acts wonky, I know which one to flip. Having a before pic is a lifesaver.

 

[Smokinone]

When I recap, I usually follow the orientation of the old cap, I have seen too many incorrect silkscreen polarities. Sometimes I forget the orientation and reference the silk, but always write it down so if something acts wonky, I know which one to flip. Having a before pic is a lifesaver.

I found this Taiwan 25 like the one we're working on here. Kinda fuzzy as not a very good pic, but it seems to show that I have the new one in wrong..but fuzzy pic and fuzzy eye sight.

 

[Smokinone]

When I recap, I usually follow the orientation of the old cap, I have seen too many incorrect silkscreen polarities. Sometimes I forget the orientation and reference the silk, but always write it down so if something acts wonky, I know which one to flip. Having a before pic is a lifesaver.

You're correct, I'm getting sloppy in my old age.

 

[Cable Guy]

I found this Taiwan 25 like the one we're working on here. Kinda fuzzy as not a very good pic, but it seems to show that I have the new one in wrong..but fuzzy pic and fuzzy eye sight.
View attachment 77293

Yeah, hard to see the details, and I wish I had one here to look at, but I'd bet you a dollar it's backwards. I don't see many 25s these days.

 

[Cable Guy]

You're correct, I'm getting sloppy in my old age.

It happens, age and eyesight be darned, I have perfect 20/20 vision and still good goof sometimes. It's not that we goofed, but that we catch it and fix it.

 

[brandon7861]

Easier to see, from CBTricks.

 

[Smokinone]

Easier to see, from CBTricks.
View attachment 77294

I looked at those and it seems the positive goes to ground, but not sure if the board actually has the positive position marked correctly. If the board is marked correctly, then it's installed correctly after my re-cap, if not, and that we're not sure of, then I installed it incorrectly. I need to get the radio back in my hands.
Thanks much guys for the research and good eyes.
edit: I seem to remember now that i think about it as it was the only 6.3 volt cap on the board.

 

[Cable Guy]

That limiter circuit works on the negative going portion of modulation on that line and is what it senses for limiter action, that cap is tied to the base of a pnp transistor, so that's why the cap has positive side to ground, because the voltages going through there are negative with respect to ground.