resistor types
The most commonly used resistors are the metal film type. They're small and can handle some power. The film is constructed in a spiral around a ceramic substract. So it also is a coil with some induction (never specified!). The common tolerance is 1% (5 rings with the last one brown).
There still are some old fashioned carbon types. They can be recognised because there's no "cap" at the ends. The connection wire is pushed in the center core of the carbon roll. This type holds carbon pressed in one piece. So there's no "ceramic roll", it's just a massive piece of carbon. So there's hardly an inductance. This type has a tolerance of 10 or even 20%. But it's prefered by a lot of tube lovers!
Also available is a more "modern" type of carbon resistor. That one has caps on both ends. It's conctructed as a spiral around a ceramic roll. So there's induction again. Tolerances are 5 or 10%.
A different way to improve the "sound quality" is using bigger types, i.e. 1 Watt types. Those have less noise while still having a tolerance of 1% (metal film type).
Another way to improve the result is using small metal film ones but using two in parallel. In doing so the total induction will go lower and noise also decreases. The value should be twice the wanted value.
John
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Originally Posted by johnrtd
