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Candohm and push buttons for a Philco 41-280
#3

(08-05-2015, 06:55 PM)ccomer1955 Wrote:  Also, does it matter whichend of the candohm I connect the negative leads of the electrolytics? The schematic seems to indicate the negative leads of the 16uf and 8uf caps ground at the same spot, but in the set, the 8uf and the 12 uf are in the same mute-section tube, so they ground at the same spot. Sorry if that's a dumb question, but I will likely place the wiring as it is now.

The negatives of the 16uF and 8uF both go to chassis ground.  So it will definitely matter which end of the candohm you connect them to.  One end of the candohm goes to chassis ground and the other end goes to the power transformer center tap of the HV winding.  So you want to go to the end that goes to chassis ground (the 15 ohm end).

Although, you don't even need to connect these two caps to the candohm at all.  Since the negatives go to chassis ground, you can put them on any convenient solder point to chassis.  They don't even need to be tied together before going to the chassis.  If it makes it easier to physically wire one cap on one end of the chassis and the other on the other end of the chassis, just tie each negative lead to the closest chassis solder point/tab that connects to the chassis.

You do need to make sure the 12uf is connected to the end of the candohm that connects to the CT winding (the 146 ohm end) though, and not chassis ground.  Otherwise you will have some major hum issues.





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