# Replacement 100 ohm resistor for differential scope probe? [closed]

I'm trying to use a P7504 ($) "TriMode" scope probe, and unfortunately the resistors eventually break. Does anyone have recommendations for a 100ohm resistor that would replace the ones on the probe? A new set of just ends is$1600

• For a $1600 probe? Might as well go with the best and I don't know resistors that are more precise or stable than metal foil resistors. Feb 18, 2020 at 21:45 • I have used a similar Tek probe. For a 4 GHz probe, many parameters of the resistor may be critical. If I was making critical measurements, I would only use the exact resistor. Feb 18, 2020 at 22:09 • Yes, that is why I reached out to ask what resistors are ideal to replace the ones on the probe :) Feb 19, 2020 at 16:41 ## 1 Answer That's a 4GHz probe. This Vishay app note on high frequency parasitics may be of use. One could imagine attaching wires to an 0402 resistor and adding a bit of epoxy... but.. A set of 50 ea. 100 ohm + 50 ea. 75 ohm appears to be a mere$700 from Tektronix. 020-2937-00

• Thank you, Spehro - half the price of the probe kit for 50 of the resistors we actually need sounds more in-line with what we need. Hopefully this helps someone else, too Feb 19, 2020 at 16:42