Hoping someone can assist me finding a suitable replacement for this PTC. Part Number printed on it is "T 70AR6U2" and included a pic, but I can't find anything using Google that links to a similar part, with the ceramic rectangular body and two wires. There are plenty of PTCs to choose from on Mouser or Aliexpress - but what voltage and amperage should I look for? I'm also assuming this is a 70-degree PTC? from the part number?
This is attached to a TO-3 transistor can to monitor heat and wired to the +/-12V stand-by relay/trigger - so when the resistance increases the voltage drop causes the 12V relay voltage to drop below ~9V and put the amplifier into stand-by and therefore turning off the amp to stop what ever is causing the overheating.
The PTC on the left channel measures close to a short, maybe 0.5R, but the right channel measures 300-600R. It's an intermittent issue, causing the amp to not turn-on, then when it does turn on it will turn off at random times (could be 15 mins or it could be 2 hours. I have jumped/shorted the right channel PTC and the amp works fine and all the outputs stay below 45C, even after 2-3 hours of music.
Hoping to find something pretty similar, drop-in replacement so I don't need to modify anything with the amplifier. Planning to replace both PTCs, so the protection would be the same for both channels.
Thanks for the assistance.
This is attached to a TO-3 transistor can to monitor heat and wired to the +/-12V stand-by relay/trigger - so when the resistance increases the voltage drop causes the 12V relay voltage to drop below ~9V and put the amplifier into stand-by and therefore turning off the amp to stop what ever is causing the overheating.
The PTC on the left channel measures close to a short, maybe 0.5R, but the right channel measures 300-600R. It's an intermittent issue, causing the amp to not turn-on, then when it does turn on it will turn off at random times (could be 15 mins or it could be 2 hours. I have jumped/shorted the right channel PTC and the amp works fine and all the outputs stay below 45C, even after 2-3 hours of music.
Hoping to find something pretty similar, drop-in replacement so I don't need to modify anything with the amplifier. Planning to replace both PTCs, so the protection would be the same for both channels.
Thanks for the assistance.
Attachments
It's a temperature control switch
https://depoinovasi.co.id/temperature-control-switch-70-derajat-celcius-t70ar6u2/
Since it's control a 12V relay coil, I think the voltage and current rating is not critical.
uxcell KSD9700 Thermostat, 70℃ Normally Close Temperature Switch
Thermostat 158°F (70°C) SPST-NC Radial Wire Leads - 4" (101.6mm)
https://depoinovasi.co.id/temperature-control-switch-70-derajat-celcius-t70ar6u2/
Since it's control a 12V relay coil, I think the voltage and current rating is not critical.
uxcell KSD9700 Thermostat, 70℃ Normally Close Temperature Switch
Thermostat 158°F (70°C) SPST-NC Radial Wire Leads - 4" (101.6mm)
I think this one with ceramic body is more similar to the "T 70AR6U2"
uxcell 70℃ N.C 5A Thermal Switch
Thanks for the responses and links - I ordered (2) of the 250V 5A plastic 70C from Amazon. See how close it matches but looks very similar from the pics.