geoff. Posted November 7, 2021 Share Posted November 7, 2021 Quote Link to comment Share on other sites More sharing options...
geoff. Posted November 7, 2021 Author Share Posted November 7, 2021 Is this it? This little tiny capacitor looking disc paralleled with the resistor? (Yes, the crossover in the picture is from the KP-320, but it is the same part according to the respective schematics.) Is it “necessary” and can something else be substituted? Is this what is referred to as a polyswitch? Quote Link to comment Share on other sites More sharing options...
Marvel Posted November 7, 2021 Share Posted November 7, 2021 It's a polyswitch, used to protect the tweeter from overvoltage. You can remove it if you want... just don't overdo it on the power. 2 Quote Link to comment Share on other sites More sharing options...
geoff. Posted November 7, 2021 Author Share Posted November 7, 2021 Thanks! That is great news, one of the ones on the 301 crossover is scorched. Do I leave the parallel 200 ohm resistor in place or does it come out too? Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted November 8, 2021 Share Posted November 8, 2021 (edited) You need to take the resistor out if you are going to take the polyswitch fuse out. The polyswitch is of very low resistance when at it's normal operating currents, when a fault is detected by increase in current the polyswitch increases it's resistance to reduce current and protect the tweeter. When the polyswitch is at normal current and normal operating conditions of low resistance it being in parallel to the 200 ohm resistor will pass almost all of the normal operating current. If you just remove the polyswitch you will have 200 ohms in series with the tweeter seriously reducing it's output to almost nothing. Edited November 8, 2021 by captainbeefheart 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted November 8, 2021 Share Posted November 8, 2021 38 minutes ago, captainbeefheart said: You need to take the resistor out if you are going to take the polyswitch fuse out. The polyswitch is of very low resistance when at it's normal operating currents, when a fault is detected by increase in current the polyswitch increases it's resistance to reduce current and protect the tweeter. When the polyswitch is at normal current and normal operating conditions of low resistance it being in parallel to the 200 ohm resistor will pass almost all of the normal operating current. If you just remove the polyswitch you will have 200 ohms in series with the tweeter seriously reducing it's output to almost nothing. 5 hours ago, geoff. said: Do I leave the parallel 200 ohm resistor in place or does it come out too? I would replace the faulty RD050 Polyswitch or both the Polyswitches ,(peanuts in terms of cost could be 1$ https://www.digikey.ca/ ) to restore the Protection circuit of the network 1 Quote Link to comment Share on other sites More sharing options...
Blvdre Posted November 10, 2021 Share Posted November 10, 2021 or you can just clip it out, leaving as much of the leads as possible. Form a couple of j-hooks, connect and solder, and you're done. No need to move the 200 ohm resistor of you go this route. 2 Quote Link to comment Share on other sites More sharing options...
Dave A Posted November 10, 2021 Share Posted November 10, 2021 What you need to do is replace the polyswitch and leave the resistor in there. Blvdre is giving you the right way to do this. 2 Quote Link to comment Share on other sites More sharing options...
geoff. Posted November 11, 2021 Author Share Posted November 11, 2021 First off, thanks for all of the replies! Where would I get a polyswitch? From Klipsch? Quote Link to comment Share on other sites More sharing options...
OO1 Posted November 11, 2021 Share Posted November 11, 2021 any place that sells capacitors would have polyswitches , Quote Link to comment Share on other sites More sharing options...
Dave A Posted November 11, 2021 Share Posted November 11, 2021 This should work. https://www.erseaudio.com/Products/Polyswitches/R60-050-L 2 Quote Link to comment Share on other sites More sharing options...
OO1 Posted November 11, 2021 Share Posted November 11, 2021 I believe @geoff. is Canadian -no point in paying customs- duties - taxes -shipping for about 50 cents Can$ of polyswitches he can buy locally in Ontario- Quote Link to comment Share on other sites More sharing options...
geoff. Posted November 12, 2021 Author Share Posted November 12, 2021 @RandyH, have you been going through my mail? Lol. I just recently received my Canadian citizenship in the mail! Until then I was a landed immigrant. Moments away from deportation, NOT, the Canadian economy would collapse without my tax contribution, lmao. Fitting story on Remembrance Day here. My father was in the USAF and my mother in the RCAF when they met at a dance in France, for real. Fell in love, got married and moved back to the States. I was born on a USAFB to a Canadian mother while my dad was an air traffic controller in Viet Nam. A few years after his second tour was over we all moved up here to be closer to my mom’s family. My father was the proudest American I have ever met. 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted November 12, 2021 Share Posted November 12, 2021 On 11/11/2021 at 10:37 PM, geoff. said: @RandyH, have you been going through my mail? Lol. ........ Quote Link to comment Share on other sites More sharing options...
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