You spend 3 cents on a resistor? I got one of these, resistors shipped from around the world for less than a penny each:
https://www.ebay.com/itm/305699823839
They're fine, though the leads are thinner than on the resistors I've gotten from Digikey. They do seem to be with 1 percent, but of course as you say gridstop resistors don't need that much accuracy. If I need accuracy I always measure the values with an accurate meter anyway.
Some people do spend 3 cents on a resistor when they only buy what they need and not excess, and are conditioned to getting things through trusted channels. I have no problem with spending 3 cents in hundreds at Mouser, since they are usually bundled in with $3 semiconductors that I would not trust to E-bay or Aliexpress if my life depended on it. $3 orders don’t make sense, even IF there was free shipping, and usually there is not. I wait till it amounts to something unless it’s an emergency. For a grid stopper it wouldn’t be because those values get reordered long before running out, and a tube amp project isn’t enough of an emergency to pay a bunch of extra shipping for anyway.
All resistors are shipped from around the world, BTW. They might make a stop Mansfield or Thief River Falls, but they came from the other side of the globe.
All resistors are shipped from around the world, BTW. They might make a stop Mansfield or Thief River Falls, but they came from the other side of the globe.
Don't like resistors, can use a small inductor, a few turns of wire (silver or platinum if one is an audio nut), or a ferrite bead over straight wire.
If you want to get more than -174dBm/Hz noise from a resistor, then . . .
Run some DC current through the resistor
Run some large signal currents through the resistor
Use contaminated resistive elements
Use contaminated metal connections to the reistance element (maximize by doing that at both ends).
Be sure to place the signal resistor right next to a very Hot B+ resistor. (Raise the signal resistor temperature).
There may be other causes of increased resistor noise that I forgot above.
Experiment!
$0.03
Run some DC current through the resistor
Run some large signal currents through the resistor
Use contaminated resistive elements
Use contaminated metal connections to the reistance element (maximize by doing that at both ends).
Be sure to place the signal resistor right next to a very Hot B+ resistor. (Raise the signal resistor temperature).
There may be other causes of increased resistor noise that I forgot above.
Experiment!
$0.03
No resistor is perfect construction. The question is whether they are -173.9dBm/Hz or -163.9dBm/Hz, or worse for a real POS that makes racket when you put your finger on it.
Ferrite beads are “high frequency resistors”. But that in itself implies nonlinearity. The whole idea of it will stick in people’s crotch, even if the result is inaudible.
Ferrite beads are “high frequency resistors”. But that in itself implies nonlinearity. The whole idea of it will stick in people’s crotch, even if the result is inaudible.
