::::Hello all! On my Silvertone 1828 there are 3 electrolytic caps. 2ufd, 8ufd and 14ufd. This is what the parts list calls out. The 14ufd and 8ufd symbols on the schematic have a straight line on one end and a u-shape on the other end. Which end is positive? I labeled the old ones when I took them out but their connections don't make sense now. Also the 2ufd 300V on the schematic is represented by a standard capacitor symbol. One end of this 2ufd goes to ground and the other end is common to all three 78 tube grids, I think it's the grid. Why is this not represented as an electrolytic as the 14ufd & 8ufd and what would the polarity be on this one. I know from experience now that you folks can bail me out so thanks ahead of time.
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:::Johnny: the positive side of the 14 & 8 mfd filter caps tie to the rectifier cathode. Negative goes to B-. The 2 mfd cap neg is on the ground side.
:::Steve
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:::Thanks Steve. I'm still a little confused. I understand the 2ufd. That's clear now. The + of the 8ufd and 14 ufd connect to the rectifier cathode. That's clear now. But the - of the 8ufd appears to go to chassis ground on the schematic. I guess my confusion is with the - of the 14ufd which looks like it connects to the transformer and also goes through a 960 ohm coil of some kind and then through a 10 ohm 1 watt resistor to chassis ground. Can you explain this for me? Thanks!
::Johnny
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:Johnny: yes that's correct. You have the condenser input type filter. The high voltage winding center tap of your transformer is B- tied to ground. One purpose of the output condenser (8 mfd) is to pass any signal currents on the output tubes plate circuits to ground.
:Steve
Johnny, the old schematic symbols varied at first but almost all curve or "u" the neg on the electrolytics. If you think of it, it looks like a can (neg on caps). PL