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Old 20th June 2012, 10:33 PM   #1
Einric is offline Einric  United States
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Default Simple P-P Resistors

I have quite a supply of NOS Motorola Carbon Composition resistors in my file.
I was wondering if I stick to at least the wattage rating of the required resistors and bin them them for tolerance would they be suitable for use?
I understand that CC resistors will drift with temperature but assuming decent air flow that shouldn't be an issue right?
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Old 21st June 2012, 07:52 PM   #2
rknize is offline rknize  United States
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Yes, they will work just fine. Just note that CC resistors tend to introduce more noise than other types.
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Old 29th June 2012, 01:44 PM   #3
Einric is offline Einric  United States
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Do the Carbon Film resistors bring in noise?
Are they a suitable replacement for the Metal Film?
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Old 29th June 2012, 02:15 PM   #4
akimmet is offline akimmet  United States
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If you need to buy new resistors, just buy the metal films. The difference in price on small quantities (under 500) is completely negligible. However; I wouldn't hesitate using carbon film if that was what I had on hand.

Carbon comp on the other hand are known to be very noisy. What is worse is over time they can drift in value by more than 50%.
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Old 29th June 2012, 04:56 PM   #5
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I would only use them for grid stoppers. PRP metal film are a good deal (kinda, relative to Vishay bulk foil at least) for an "audio grade" resistor with non-magnetic construction. Kiwame carbon film are warmer (and available as a non-audio resistor for 1/10th the price), and Amtrans just came out with resistors including a carbon film that's supposed to top the Rikens, which are now out of production. Riken and Amtrans should be less warm and more detailed vs Kiwame but are still carbon film.

I also just replaced Kiwame with Mills wirewound in the cathodes of my EL34s in my SSE and they are less warm and more neutral... probably the cleanest option I have heard so far, but depends on your personal preferences. I also use Mills resistors in the power supply.
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Old 1st July 2012, 02:16 PM   #6
Einric is offline Einric  United States
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Is the 5% tolerance good enough or should I be picky with the values to get as close as possible to nominal value?

A lot of the Metal Film are 2% which is nice but I have a bunch of 5% Carbon Film on hand.
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Old 1st July 2012, 05:39 PM   #7
akimmet is offline akimmet  United States
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Even 10% tolerance won't hurt anything. Go right ahead if you have 5% carbon films.
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