Part # 1445, voltage divider network

[Randy Rago]

Or if in the Zenith world, a "Candohm". In the masterpiece, its 3825; 980; 780; 1975 ohms. Im replacing it with discreet power resistors. 5 or 10 watters?

[George]

Yes those Candohm resistors always seem to fail despite their apparent rugged appearance in many other radios. For durability it’s always wise to choose replacement resistors with an increased wattage rating.

[Randy Rago]

I know, but thers no rating on the schematic. Or is a parts list published? Thx

[Randy Rago]

Nevermind, did the math. 6 watts, using 10 watters

[Kent King]

They wattage can be calculated via Ohm's law and the power formula. However, to shortcut those calculations, if you make each a 5W unit, you should be ok. Making the big one (3825) a 10W unit would be prudent. I never noticed the schematic shows two different resistors with the same voltage drop. If they are, in fact 980 and 780, the drops won't be exactly the same, 980 should be closer to a 30V drop and 780 nearer 20V...in practice, with our higher line voltages, everything will probably be higher, and as long as they are consistent with each other, the set will operate just fine.

Kent

[Randy Rago]

230v drop across 7560 ohms gets me close to 6 watts across the array. So 10 watters will be good. Nice catch on that noted 25v drop across two different values!

Factor in a +/- 20 % tolerance and im fine. Thanks for the input.