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Mark Levinson 336 blowing fuses in home
Mark Levinson 336 blowing fuses in home
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Old 3rd August 2016, 07:17 AM   #1
wmns is offline wmns
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Default Mark Levinson 336 blowing fuses in home

Hi,

I have 2 ML 336 amps. One of them is blowing the 20 Amp fuses in my home when switching from off to standby. I found that there are 3 wire wound resistors inside, that I guess are used to slowly load the huge caps in this amp. These wire wound caps are defective. Anyone knows where to get them and what would be the specs of these resistors ? Thanks.
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Old 3rd August 2016, 08:06 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Resistors of that type go open circuit. I suspect you have an RCD trip and it is detecting a leak to earth maybe?
No idea where you are, voltage, fuse types or house wiring. To make an informed appraisal we need to have more information.
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Old 3rd August 2016, 08:16 AM   #3
wmns is offline wmns
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Thanks for your reply. I am in Belgium (220 V, 50 Hz) and since I have 2 ML 336 amps it should not be related to wiring in my home. Attached a picture of the wire wound resistors where it can clearly be seen that the wire is interrupted. Any chance to repair the wire with resistance wire. I found that the resistors are 10 ohm.
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File Type: jpg IMG_7152 (Medium).JPG (219.6 KB, 300 views)
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Old 3rd August 2016, 08:37 AM   #4
Bonsai is offline Bonsai  Europe
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Have you measured the resistance on the ones that are faulty?
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Old 3rd August 2016, 08:39 AM   #5
MIKEVO is offline MIKEVO  United Kingdom
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At least 2 of the wire wounds are open circuit, so could be touching another track, causing the breaker to trip.

I would buy the largest wattage 10 ohm resistors you can fit in the space and not use resistance wire.

I presume the main reservoir caps have been replaced looking at the screw heads?

I would replace the resistors and then take it from there, but they may blow again if a fault exists.
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Old 3rd August 2016, 08:41 AM   #6
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As the wiring is interrupted I cannot measure the resistance. Learned from the importer that the resistance is 10 ohm. Of course one solution would be to order it from them, at an excessive price probably.
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Old 3rd August 2016, 08:50 AM   #7
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Forgot to mention that it is possible to switch on the amp by putting a 1000 w lamp in series, which I short circuit after the amp is switched on. Amp is playing without any faults and also caps look good. Any idea on the required wattage of a non wire wound resistor ?
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Old 3rd August 2016, 09:30 AM   #8
MIKEVO is offline MIKEVO  United Kingdom
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The correct spec for the 331,332 and 333 is Nichrome 0.024 wire with 10 Ohms Resistance.

However, I'm not 100% sure on the 336.

It heats up temporarily to about 1000 Deg C and is designed to break at 1400 Deg C to avoid damage to the amp, so if you wish to use a resistor, you will have to go high wattage and if it breaks, go higher again.

Nichrome wire is more like your lightbulb principle than a simple resistor.
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Old 3rd August 2016, 09:37 AM   #9
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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These will stand 22A
HL22507E10R00JE | Vishay HL Series Radial Wirewound Resistor 10Ω 5% 225W 30ppm/C | Vishay
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Old 3rd August 2016, 10:03 AM   #10
ColinA is offline ColinA  United Kingdom
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Quote:
Originally Posted by MIKEVO View Post
It heats up temporarily to about 1000 Deg C and is designed to break at 1400 Deg C to avoid damage to the amp, so if you wish to use a resistor, you will have to go high wattage and if it breaks, go higher again.
Is this not like fitting a bigger fuse because it keeps blowing?

The FIRST thing to do is find out why they were overloaded.
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