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Old 8th June 2012, 08:43 AM   #21
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I found this MOV on ebay listed for 3.75 best offer free shipping. It seems like it would do the job and then some hopefully. Or am I misunderstanding the values of clamping voltage and other ratings?
GE Littelfuse- Radial Leaded Varistor V1000LA160B 1000VAC MOV Metal Oxide
http://www.littelfuse.com/products/V...000LA160B.html

Last edited by Clemford; 8th June 2012 at 09:01 AM.
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Old 8th June 2012, 09:26 AM   #22
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I think I have a couple little surge suppressor pcb's that were meant for strip lighting; they even have led's to tell you if AC is present and if the MOV is blown. You are welcome to have one if you want it.
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Old 8th June 2012, 10:57 AM   #23
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A MOS varistor doesn't begin to act until the nominal voltage, thus a 1000 VAC varistor allows motor spikes on a 120 VAC line right through without supression. See this at Mouser in TX, V14E230P Littelfuse Varistors
for $.34 each. Nominal DC voltage 300, clamp voltage 595, 14 mm size like a motor drive has. Your transformer wiring should be able to stand 595 v. As far as the $9 USPS priority shipment cost, tack the varistor onto the order for the capacitors. You want the capacitors rated at 1000 v, that is the voltage where they might break down, and you don't want the capacitors breaking down, as it is permanent, leaving a short circuit. MOS varistors are designed to break down over and over again and when they wear out they frequently are open.
I see you are in FL, Newark is closer at NC. Whichever, if you're receiving at a house, select USPS shipment to avoid the residence surcharge from UPS or worse, FedEx. I get UPS business rate, which is cheaper over short distances, ~$6 for 2 pounds. FedEx treats me as a residence, double charge at $13 minimum. USPS is $6 or $9 depending how much packaging they use.
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Last edited by indianajo; 8th June 2012 at 11:11 AM.
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Old 8th June 2012, 07:58 PM   #24
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Quote:
Originally Posted by theAnonymous1 View Post
I think I have a couple little surge suppressor pcb's that were meant for strip lighting; they even have led's to tell you if AC is present and if the MOV is blown. You are welcome to have one if you want it.
thanks for the offer, it's really decent of you. I'll try indiannajo's parts source again. I don't mind spending some cash on this amp. I got it for 50.00 because the guy broke the input jack and his cat used the carpet covering for a scratching post. It's only 2 years old and otherwise perfect. I went for 450.00 originally. thanks again for the offer. I like the idea of knowing whether the mos is still working. Is there an IC that controls the led?
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Old 8th June 2012, 08:06 PM   #25
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Quote:
Originally Posted by indianajo View Post
A MOS varistor doesn't begin to act until the nominal voltage, thus a 1000 VAC varistor allows motor spikes on a 120 VAC line right through without supression. See this at Mouser in TX, V14E230P Littelfuse Varistors
for $.34 each. Nominal DC voltage 300, clamp voltage 595, 14 mm size like a motor drive has. Your transformer wiring should be able to stand 595 v. As far as the $9 USPS priority shipment cost, tack the varistor onto the order for the capacitors. You want the capacitors rated at 1000 v, that is the voltage where they might break down, and you don't want the capacitors breaking down, as it is permanent, leaving a short circuit. MOS varistors are designed to break down over and over again and when they wear out they frequently are open.
I see you are in FL, Newark is closer at NC. Whichever, if you're receiving at a house, select USPS shipment to avoid the residence surcharge from UPS or worse, FedEx. I get UPS business rate, which is cheaper over short distances, ~$6 for 2 pounds. FedEx treats me as a residence, double charge at $13 minimum. USPS is $6 or $9 depending how much packaging they use.
will that one work with 120vac line or is it for 230v and I wonder if it would be a better idea to eliminate the two caps to prevent shorts, that is if the noise isn't too bad.
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Old 8th June 2012, 11:30 PM   #26
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here's the part that's across the power switch.
Click the image to open in full size.
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Old 8th June 2012, 11:43 PM   #27
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That's an AC-rated, .01uF / 250 volt disc cap.

Mike
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Old 8th June 2012, 11:50 PM   #28
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That's an AC-rated, .01uF / 250 volt disc cap.

Mike
Is it to stop a thump during power up/off? I had a Hafler G300 amp that had a brutal thump when powered up even with the volume off. Scary for the spkrs sake.
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Old 8th June 2012, 11:53 PM   #29
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I like the idea of knowing whether the mos is still working. Is there an IC that controls the led?
Sorry, I was mistaken actually. Just dug it out of the bin and it looks like the LEDs are for AC live (yellow) and ground (green). It has three 15mm MOVs; one from live to neutral and one each from live/neutral to ground. Also has two film caps from live/neutral to ground.

You are still welcome to have it even if you just want to remove the MOVs from it. I also have a few 100nF ceramics I pulled off a power supply but they might only be 50V.
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Old 9th June 2012, 01:21 AM   #30
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Originally Posted by theAnonymous1 View Post
Sorry, I was mistaken actually. Just dug it out of the bin and it looks like the LEDs are for AC live (yellow) and ground (green). It has three 15mm MOVs; one from live to neutral and one each from live/neutral to ground. Also has two film caps from live/neutral to ground.

You are still welcome to have it even if you just want to remove the MOVs from it. I also have a few 100nF ceramics I pulled off a power supply but they might only be 50V.
thanks for offering those. I've seen a schematic that uses three like that. Do you think they're the 300/595 clamping voltage type? I'd rather be safe than sorry with all the voltage fluctuations and spikes here in FLA. The way this thing blew the caps is starting to worry me about every thing I own. I own a ton of music gear that hopefully the Furman PL-8c is capable of protecting.
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