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Old 8th July 2003, 01:43 AM   #1
Wella is offline Wella  United Kingdom
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Question 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
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Old 8th July 2003, 04:34 AM   #2
SY is offline SY  United States
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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).
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Old 8th July 2003, 11:31 AM   #3
Joel is offline Joel  United States
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"zero point five watt" is a 1/2 watt resistor.
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Old 8th July 2003, 11:49 AM   #4
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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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