#PLATE RESISTOR SIGNAL PATH SERIES#

Doing that, you can sometimes take advantage of surplus pricing, getting a Qty 100 or even 1000 lot for the same price as 10 in the regular price aisle.

#PLATE RESISTOR SIGNAL PATH SERIES#

There are many other possible considerations, non-magnetic, non-inductive, low noise, etc., but for a beginner who is putting together their first circuit I would recommend you don't worry about them.Īlso, if you're putting together your first experiments or breadboards it's not a bad idea to remember that you can create values by putting others in series or in parallel. As long as the manufacture is of good quality, price then becomes the deciding factor. Tube amps don't prefer carbon comps, the fellow who told you that does.Īs long as you meet the technical requirements of the circuit resistor value, power rating (2 to 4 times the calculated dissipation is often recommended), voltage withstand rating, etc you can pick what you like. Opinion: I'm saying all this with the thought of promoting exploration, if you just want to go with a turnkey design then don't bother reading any more of this. Kept dry, and kept well within their nominal watt allowance, I have not found substantial resistance drift - be it for low, low values found in emitter-balance resitors in solid state amplifiers, or cathode-bias series resistors, or even for high-tension anode load resistors.īut again, it could be uncommon good luck, or simply the unusually robust manufacturing standards of Allen-Bradley. Lastly, perhaps again out of uncommon good luck, or nearly total exclusion of all CC brands except Allen Bradley from my Big Box of Resistors, I have not experienced long-term value stability issues with carbon composition, so long as the things (in circuit, or out!) aren't stored where water vapor condensation or immersion is likely, especially in proximity to somewhat water soluble solder rosins or other ionic salt bearing coatings, varnishes, paints, dope, the like. So, the question is DF96, what are the conditions under which one might actually be able to measure or 'experience' the nonlinear resistance-as-a-function-of-current? In your experience … of course.

R(i) = k + ai + bi² + ci³…Then it is obvious that V(t) will not be related to I(t) by Ohm's usual resistance constant. Pardon my likely ignorance, but № 2 (increased distortion) seems mathematically to have a single attribution: non-linear resistance as a function of current. Still … this is a good point, and worth the money for high-amplification demand situations. With even modestly quiet source (I chose a night-time outdoor crickets-in-summer venue), the difference in noise-floor was almost inaudible. Did the A:B test again, and sure enough … a tiny (but clearly audible) increase in the no-signal noise floor. Cherry picked the values to match from my large collection of NOS Allen-Bradley ¼W. Then, I replaced all the critical MF resistors with CC, of the same values. Determined they were essentially indistinguishable.

In what few iterations I've done with making ribbon-microphone preamplifiers (which are tasked with amplifying amongst the weakest full-range signals in all audio source conditions), I can attest to metal-film resistors being superior, when needed, in minimizing noise.īut … one day out of curiosity, having a pair of 'preamps in progress' for a friend, I started out with all-film on both. I imagine № 1 is, like all thermal-resistance related noise, proportional to the value of the resistance and the current being passed thru. Just as a note and perhaps nucleus of further discussion, your 3 points enumerated:

Plate resistor signal path