Vintage HiFi Audio Forum

Audio Discussion => DIY => Topic started by: OldiesButGoodies on February 05, 2014, 12:33:10 PM

Title: Carver C-9 Recap Question
Post by: OldiesButGoodies on February 05, 2014, 12:33:10 PM

I am recapping a C-9 and have a curiosity-driven question.  The power supply section (schematic below) has 4 1000uF caps,  two are 25V and two are 16V. What is the point of using this different voltages at the same capacitance? is it to limit the voltage passing through? What happens if I replace all four with similar voltage (say 25V) caps?

Thanks,

Pepe

Title: Re: Carver C-9 Recap Question
Post by: Dicky on February 05, 2014, 01:55:24 PM

From what I have learned you can go up in voltage, but not down.  All 25v should be fine in your case.

Title: Re: Carver C-9 Recap Question
Post by: treos33 on February 05, 2014, 03:33:30 PM

Those are filter caps. I don't know for sure but I would guess the first set of caps is designed to take larger fluctuations in voltage than the second set. Also there are those 200 ohm resistors in series which would definitely reduce the voltage the second set sees. You should be fine using 25V caps in both locations, this is probably just an example of Carver saving a few cents with the 16V caps and reaping the benefits from the economies of scale.

Title: Re: Carver C-9 Recap Question
Post by: OldiesButGoodies on February 05, 2014, 03:37:32 PM

That is what I thought - a cost saving design decision.

Title: Re: Carver C-9 Recap Question
Post by: papabearjew on February 05, 2014, 04:54:25 PM

CTD.  Are you licensed yet to use a soldering iron?  If not please put the iron down and step away from the bench.