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Old 11th May 2010, 04:29 PM   #1
sacpul is offline sacpul  Malta
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Default Headphone Amplifier 6922EH

I have bought a small hybrid valve headphone amplifier from ebay with 6922EH valve with 3 band equalizer.

I has connected it to the pc and use the headphones with it and pc speakers. The sound quality has improved alot and compared for the price that I spend on this small hybrid valve headphone amplifier it is worth it.

My problem is that there are 2 mosfets IRF630 that are getting very hot. When I checked the datasheet of this component it says that will works up to 150 degrees celcius.

Has someone have this kind of product with equalizer or not. Before I had one without equalizer and had the same question about the IRF630. Is it standard that both IRF630 becomes veryhot?

Thanks Alot and Best Regards
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Old 11th May 2010, 06:33 PM   #2
Stixx is offline Stixx  Germany
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Are the IRF630 heatsinked? If so, how hot are the heatsinks...

I have a small hybrid headphone amp that has the heatsinks at about 75C after 30min... seems not to harm anything.
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Old 11th May 2010, 07:41 PM   #3
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this amp has very small heatsinks. cost effective.......
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Old 11th May 2010, 10:55 PM   #4
sacpul is offline sacpul  Malta
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This becomes hot about 3 to 5 mins. When I used it about an hour it becomes very hot.

When you touch the heatsinks cannot support the ammount of heat that it is raised on my finger. Even the perspex is getting hot altough it is not touching the heatsink.

I worried that the 2 mosfet IRF630 will become faulty coz of the high tempreature.
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Old 12th May 2010, 01:32 PM   #5
Stixx is offline Stixx  Germany
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As I said... the heatsinks on my little hybrid are at about 75 Celsius and definitely too hot to touch. But they don't go higher so I can live with it.

I wouldn't be worried...
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Old 12th May 2010, 01:35 PM   #6
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could you send a pic of this amp?
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