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Peavy Hisys XT crossover help. |
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Shortrope 
Young Croc 
Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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 Topic: Peavy Hisys XT crossover help.Posted: 14 August 2019 at 11:26am |
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This is a long shot but I’m trying to do a favour for a pal and repair his old Peavey crossover.
I need to find the spec for this Thermistor.   |
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My Tinnitus is coming along nicely!!
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cravings
Old Croc 
Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7157 |
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Posted: 14 August 2019 at 11:48am |
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does he have a second one the same?
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Shortrope
Young Croc
Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Posted: 14 August 2019 at 11:54am |
Urrgh!...Face+Palm...I didn't think of that! It's a 40min drive away and I was there yesterday.
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My Tinnitus is coming along nicely!!
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cravings
Old Croc
Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7157 |
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Posted: 14 August 2019 at 12:34pm |
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he could take a photo of it.. it probably says something on it..
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3803 |
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Posted: 14 August 2019 at 2:15pm |
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Perhaps more likey to be a Polyfuse rather than a thermistor? A thermistor that small wouldn't really have a place in a high powered crossover circuit, whereas a 1 amp Polyfuse is about that size and would offer useful protection to the HF driver, if it's in series?
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Studio45 - Box Builder Commotion Soundsystem -Mobile PA
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Shortrope
Young Croc
Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Posted: 14 August 2019 at 2:18pm |
Yeah you're right I don't think it's Thermistor now either. I was wondering if it's a Ceramic Capacitor.
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My Tinnitus is coming along nicely!!
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studio45
Old Croc
Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3803 |
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Posted: 14 August 2019 at 2:28pm |
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Again, at that size, it could only be a few hundred pF at most - so not gonna be doing much filtering in a low-impedance circuit....
I also see what looks like a dry joint at the bottom centre of the board (dark ring all the way around the component leg) If you can sketch out a schematic, and the mystery component is indeed in series with the HF and in parallel with that light bulb, then it's a classic Polyfuse protection circuit. When the Pfuse opens, all the current has to flow through the bulb, which will drop the excess power, and then blow itself if you're really silly or your amp is oscillating. In which case, I would try replacing with a 500mA Pfuse and see if that works.
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Studio45 - Box Builder Commotion Soundsystem -Mobile PA
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tomr_29
Young Croc
Joined: 23 February 2009 Location: West Midlands Status: Offline Points: 540 |
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Posted: 14 August 2019 at 5:59pm |
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Yeah this is a polyfuse. I’ve replaced a few on a number of Peavey Hisys crossovers. Typically have used a 250mA and actually still have a few left. The part number on the pack is 647-8443 (RS components part number).
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Proper capitalisation is the difference between helping your Uncle Jack off a horse and helping your uncle jack off a horse.
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Shortrope
Young Croc
Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Posted: 14 August 2019 at 6:52pm |
Legend! Thanks a million!
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My Tinnitus is coming along nicely!!
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Five &
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Joined: 22 May 2008 Location: Caribbean Status: Offline Points: 142 |
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Posted: 18 February 2021 at 11:48am |
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Polyswitch For Peavey Soundguard HF Protection Circuit Part # Rxe030 (X030) |
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Let The Music Play
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VECTORDJ
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Joined: 11 June 2006 Location: United States Status: Offline Points: 373 |
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Posted: 18 February 2021 at 8:10pm |
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I thought it was RXE035 but poster that says RXE030 may be right. I always thought the value was too low. It must latch and send the power to the bulb as soon as You crank it up. 030 will trip/latch at .60 amps. Any other ideas??
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cravings wrote: