Where can I find a replacement

[Benni777]

Hello friends,

A friend of mine has a pair of polk r30 that appears have have a bad resistor. Where does everyone buy their components at? I'm looking for what appears to be a 5W2R5J resistor ...???

 

[Eppie]

That is 5 watts 2.5 ohms. Can be porcelain or ceramic or sometimes refered to as a cement resistor. Get at least a 5% tolerance or less. PartsExpress or Digi-Key or StewMac.... lots of suppliers out there. Not all will sell singles. Some only sell with minimum amounts. Someone in the U.S. will probably have a preferred supplier in mind.

 

[Benni777]

That is 5 watts 2.5 ohms. Can be porcelain or ceramic or sometimes refered to as a cement resistor. Get at least a 5% tolerance or less. PartsExpress or Digi-Key or StewMac.... lots of suppliers out there. Not all will sell singles. Some only sell with minimum amounts. Someone in the U.S. will probably have a preferred supplier in mind.

Thank you for you input that was very helpful.

 

[Benni777]

One more question, what's the brown one? 0.220100v

 

[Benni777]

Maybe 0.22J100V actually looking back a it. Is this a resistor or capacitor?

 

[Eppie]

Maybe 0.22J100V actually looking back a it. Is this a resistor or capacitor?

0.22 microFarad capacitor rated at 100 volts. Those ceramic capacitors are tough and likely not damaged by the burnt out resistor. The black one in the corner is an electrolytic capacitor. The casing usually bulges out when they go bad. I don't see any physical damage on it. Likely just the resistor burnt out.

 

[highfigh]

0.22 microFarad capacitor rated at 100 volts. Those ceramic capacitors are tough and likely not damaged by the burnt out resistor. The black one in the corner is an electrolytic capacitor. The casing usually bulges out when they go bad. I don't see any physical damage on it. Likely just the resistor burnt out.

Look at the top of the cap- the lines aren't straight, so it may be 'domed'. They should look straight at any angle.

 

[Eppie]

Look at the top of the cap- the lines aren't straight, so it may be 'domed'. They should look straight at any angle.

Hard to tell from that angle. Need a side profile. The value is written on the side. If Benni777 decides to replace that cap as well, keep the polarity the same. There is a white line on the bottom side in the photo and the replacement should be installed with the same orientation.

 

[highfigh]

Hard to tell from that angle. Need a side profile. The value is written on the side. If Benni777 decides to replace that cap as well, keep the polarity the same. There is a white line on the bottom side in the photo and the replacement should be installed with the same orientation.

Not really- if the top of the cap is actually flat, the lines will be straight from any angle. I don't see a straight line.

I would probably use a non-polar cap as a replacement, but I understand the use of a radial cap to save space.

 

[Benni777]

Thanks guys, Much appreciated! I will look into the caps as well. I figure if the cost is low why not change it anyways.

 

[Eppie]

Thanks guys, Much appreciated! I will look into the caps as well. I figure if the cost is low why not change it anyways.

Just the electrolytic and the resistor. The ceramic cap will be fine. The electrolytic has a di-electric material that can leak out, or if it expands can cause the casing to bulge. You could put a flame to the ceramic and it would still work fine.

 

[Benni777]

Late on the reply, but here is the cap. Looks like. Y.C 8uf 50v. 85°. But I could use any cap as long as it's a non polarized 8uf 50v electrolytic capacitor???

 

[Benni777]

Oddly enough, I can't seem to find these exact components.
5 watt 2.5 ohm resistors
8 uf 50v capacitors
I find near values but not sure how that would affect the overall sound and or quality. Or if it would even work???
Thoughts?

 

[Swerd]

Oddly enough, I can't seem to find these exact components.
5 watt 2.5 ohm resistors
8 uf 50v capacitors
I find near values but not sure how that would affect the overall sound and or quality. Or if it would even work?

A general rule of thumb for crossover parts is that any part within 10% of the specified value can work. For a 2.5 ohm resistor, ±10% puts you in the range of 2.25 to 2.75 ohms. This 2.4 ohm $1.41 resistor should work:

Home

Dayton Audio DNR-2.4 2.4 Ohm 10W Precision Audio Grade ResistorDayton Audio DNR Series "Audio Grade" resistors are primarily used in Zobel networks and fixed L-Pad attenuator circuits. Nickel-chromium elements, a high thermal conductivity ceramic core, and welded construction all contribute to...

www.parts-express.com

Or if you want to splurge you can pay $1.69:

Home

Dayton Audio DPR10-2.4 2.4 Ohm 10 Watt Precision 1% Audio Grade ResistorDayton Audio's Precision Series Audio Grade resistors are designed specifically for use in high-end, no compromise crossover networks. The nickel-chromium winding, a high thermal conductivity ceramic core, welded...

www.parts-express.com

Both resistors are rated 10 instead of 5 watts. Those wattage ratings are failure ratings. A 10 watt resistor will handle more power than a 5 watt resistor. It will not affect your crossover to substitute a 10 watt resistor.

For an 8 µF capacitor, the same ±10% rule of thumb applies. Going higher than a 50 Volt failure rating, helps with the power handling, but doesn't affect it's performance as a capacitor. Here is an inexpensive non-polar electrolytic 8 µF rated at 100V. I hope that fits in the small space available. It can be mounted vertically.

Home

8.0uF 100V Electrolytic Non-Polarized Crossover CapacitorElectrolytic non-polarized (bi-polar) capacitors are perfect low-cost solutions for use in passive speaker crossovers. These capacitors feature axial leads, a 5% dissipation factor, and are rated at a 100 VDC working voltage which equates...

www.parts-express.com

 

[Benni777]

A general rule of thumb for crossover parts is that any part within 10% of the specified value can work. For a 2.5 ohm resistor, ±10% puts you in the range of 2.25 to 2.75 ohms. This 2.4 ohm $1.41 resistor should work:

Home

Dayton Audio DNR-2.4 2.4 Ohm 10W Precision Audio Grade ResistorDayton Audio DNR Series "Audio Grade" resistors are primarily used in Zobel networks and fixed L-Pad attenuator circuits. Nickel-chromium elements, a high thermal conductivity ceramic core, and welded construction all contribute to...

www.parts-express.com

Or if you want to splurge you can pay $1.69:

Home

Dayton Audio DPR10-2.4 2.4 Ohm 10 Watt Precision 1% Audio Grade ResistorDayton Audio's Precision Series Audio Grade resistors are designed specifically for use in high-end, no compromise crossover networks. The nickel-chromium winding, a high thermal conductivity ceramic core, welded...

www.parts-express.com

Both resistors are rated 10 instead of 5 watts. Those wattage ratings are failure ratings. A 10 watt resistor will handle more power than a 5 watt resistor. It will not affect your crossover to substitute a 10 watt resistor.

For an 8 µF capacitor, the same ±10% rule of thumb applies. Going higher than a 50 Volt failure rating, helps with the power handling, but doesn't affect it's performance as a capacitor. Here is an inexpensive non-polar electrolytic 8 µF rated at 100V. I hope that fits in the small space available. It can be mounted vertically.

Home

8.0uF 100V Electrolytic Non-Polarized Crossover CapacitorElectrolytic non-polarized (bi-polar) capacitors are perfect low-cost solutions for use in passive speaker crossovers. These capacitors feature axial leads, a 5% dissipation factor, and are rated at a 100 VDC working voltage which equates...

www.parts-express.com

Awesomeness, thank you soo much this is helpful. I am a noob I know but am learning as I go. This will help as I will be attempting a DIY 5.2.? Soon

 

[Benni777]

We ended up ordering everything we needed and rebuilt the XO. Works perfect now thanks to everyone on here.