I tested this resistor and it’s out of tolorence. It’s reading at 380 ohm and it’s rated at 350 with 5% is there an updated or different resistor I can use. It’s in a tube amplifier.
Hello,
The CPR-5 series resistor is not currently stocked by Digi-Key. This chassis mount resistor has a specific mounting feature and we would not have an stocking alternative to offer. The 5 watt, 350 ohm options we stock are axial. Those part numbers are 25J350E-ND and ALSR5J-350-ND
Here’s the last data sheet for the original series.
Here’s the datasheet for the currently available version of this series.
Looking at your picture I suspect the lead length may have been a semi-custom shorter version of the standard length options. There might not be able any way to get a single piece of this part from normal electronics parts distributors. The best bet is to contact the company that manufactures the amp and ask them to sell you a replacement part or find a company that specializes in parts for the type of tube amplifier you have.
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I appreciate all the help. I ended up contacting carvin amps. Hopefully someone gets back to me.
If Carvin won’t sell you the part then I would use a generic replacement with careful custom mounting.
- Buy a 350Ω, 5%, 5W, +/-400ppm or lower, +225°C or higher operating range, roughly the same size, Metal Oxide power resistor (don’t use a wire wound resistor as the inductance may be a problem)
- Carefully measure the free air space around the existing resistor (not just to the PCB but to the cabinet/chassis as well)
- Remove the existing resistor
- Install the new resistor so that it has the same free air space as the old resistor
The existing part with pre-set height leads was almost certainly only chosen by Carvin to ensure proper airspace without measuring or using an assembly fixture.