R11/R12 voltage rating

[kku]

I have some leftover Takman 1/2 watt resistors that are rated for 350V. Would they work there or need something that is rated for 500V like the Xicon resistors in the Mouser BOM?

[TomMcNally]

Normal voltage in that part of the circuit is about 54 volts,
so you won't have any concerns.

[kku]

I see. Is 1/2 Watt rating is going to be issue?.. since the BOM calls for 1W resistors.

[Shannon Parks]

I see. Is 1/2 Watt rating is going to be issue?.. since the BOM calls for 1W resistors.

Those will be OK. Each resistor will burn up around 200mW.

Shannon

[kku]

Sweet! I love it when I can use leftover resistors along with leftover 100uf 100V caps.

Probably a stupid question, but are there any advantages of using higher wattage/voltage rated resistors than the circuit calls for?

[battradio]

Safety margin and some circiuts larger resistors are quiter , for grids in low noise area's

[kku]

Took out the parts bin and its actually 56 ohm I have, not 51 ohm (for R11). How bad will be the heater voltage difference?

[Shannon Parks]

The schematic values are tweaked, so changing the ratio will add 120Hz hum. It won't hurt to use it but replace it when you can.

Shannon

[kku]

Oops, I better order some 51 ohm resistors.

Thanks Shannon; also, will a 51 ohm 1/2 W resistor be noisier than 51 ohm 1 watt? as in what Mark is talking about..I just want to use all Takman resistors but they only make 51 ohm in 1/2 W. I have sourced all Takman values but apparently they don't manufacture 51 ohm value in 1 W rating.