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Old 23rd October 2010, 09:43 PM   #1
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Default resistor 880 ohms cathode

hi anyone knows where to buy the resistors of 880 ohms and 50w for 300b
Angela besides instrument.gracias
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Old 24th October 2010, 12:45 AM   #2
llwhtt is offline llwhtt  United States
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Mouser has 880 Ohm 25 Watt chassis mount Dales in stock. Four in series/ parallel will give you 880 Ohms@50Watts.

Craig
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Old 24th October 2010, 01:06 AM   #3
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Quote:
Originally Posted by llwhtt View Post
Mouser has 880 Ohm 25 Watt chassis mount Dales in stock. Four in series/ parallel will give you 880 Ohms@50Watts.

Craig
I used a resistor in a TO-220 case that can be heat sinked to the chassis. I got them at Mouser.

This resistor will get very hot. I'd recommend oversizing it. 4 in a series/parallel combination is a good idea unless you have a large heatsink. It's difficult to find standard axial carbon or metal film resistors at that power level. DON'T use wire wound inductive resistors. Make certain they are a non-inductive type.
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Old 24th October 2010, 01:43 AM   #4
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Make that 100 watts. Wattage is additive whether in series or parallel.
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Old 24th October 2010, 02:11 AM   #5
llwhtt is offline llwhtt  United States
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I knew that.

Craig
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