Idiots question on resistors.
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 8th July 2003, 02:43 AM #1 Wella   diyAudio Member     Join Date: Jul 2003 Location: Wakefield Idiots question on resistors. Hello people. Im new to this forum so please be gentle (well i have been watching silently from a far for a while but now (due to being in need of help) have decided to come out from the bushes.) I built myself a valve amp from kit a while ago and am now ust about to start tweaking it. Ok the question. The circuit diagram from the amp i built (WAD KEL84) has a resistor i intend to change at 3K3 0.5W Now I have worked out, please tell me if im wrong, that this means 3.3K i suspect that they put the K inbetween as to avoid missing a "." and causing great confusion. But the 0.5W , Ok this means zero point 5 watts. But i cannot find zero point 5 watt resistors. Now is this important i asked myself. I found 3k3 2W and have even ordered some. But can i use these?? Im also changing some 6.8K (or is that 6K8) 0.5 W resistors and have got 2W replacements for these also. If this is dependant on circuit diagram and the like then what else will i need to change, Well i think ive wrote far too much just to ask a simple question Thanks for any help guys. Im sure i may be a regular visitor here asking stupid easy questions. Thanks Paul
 8th July 2003, 05:34 AM #2 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland It's a common European standard to use the unit or similar symbol in place of a decimal point. You'll see caps labelled "6u8" which are 6.8uF. The wattage is a maximum that the resistor is rated to handle, i.e., a half watt resistor can dissipate up to half a watt before being damaged. Half watt resistors are pretty easy to get, but you can generally use a larger wattage rating of the same resistance as long as it's not unexpectedly inductive (rare) and can physically fit (a higher wattage rating resistor will be physically larger). __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 8th July 2003, 12:31 PM #3 Joel   diyAudio Member     Join Date: Oct 2002 Location: Brooklyn, NY "zero point five watt" is a 1/2 watt resistor.
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Quote:
 Ok the question. The circuit diagram from the amp i built (WAD KEL84) has a resistor i intend to change at 3K3 0.5W Now I have worked out, please tell me if im wrong, that this means 3.3K i suspect that they put the K inbetween as to avoid missing a "." and causing great confusion.
YES, that is absolutely correct.

Quote:
 But the 0.5W , Ok this means zero point 5 watts. But i cannot find zero point 5 watt resistors. Now is this important i asked myself. I found 3k3 2W and have even ordered some.But can i use these??
YES...No problem

Quote:
 Im also changing some 6.8K (or is that 6K8) 0.5 W resistors and have got 2W replacements for these also. If this is dependant on circuit diagram and the like then what else will i need to change,
You don't have to change a thing, like SY said it can handle more heat.

PS. Not to keep you from doing it. But chances are you won't hear a difference.

Another PS...Be careful of high voltages. The caps can hold their charge quite a while.

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