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Old 1st April 2014, 11:01 AM   #1
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Default Pass Labs X350.5 Issue

I have just purchased a second hand Pass Labs X350.5 which sounds great.

However, when the amp is warming up, it produces a metallic clicking sound(like a relay sound). This can happen up to a couple of times, and also does the same thing when cooling down, and turned off.

Does anyone know what this may be, and if this is normal for Pass Lab Amps?

Thanks
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Old 1st April 2014, 01:59 PM   #2
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Hello!

Is the sound coming from the speakers or the amplifier itself?

It can be just the thermal expansion on the amplifier itself as it heats up and cools down (just like a car engine can do after some more "active driving"), not to much to worry about. On the other hand, if it's coming from the speaker you might want to check so that everything is OK with the amp.
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Old 1st April 2014, 03:19 PM   #3
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Quote:
Originally Posted by Chris Goldring View Post
Hello!

Is the sound coming from the speakers or the amplifier itself?

It can be just the thermal expansion on the amplifier itself as it heats up and cools down (just like a car engine can do after some more "active driving"), not to much to worry about. On the other hand, if it's coming from the speaker you might want to check so that everything is OK with the amp.
Nothing serious. It is the thermal extension of the sinks when they are heating up.
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Old 1st April 2014, 03:32 PM   #4
generg is offline generg  Germany
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It is the click, clunk when the amp goes from class A to AB, many people already wrote about this phenomenon to Nelson.....

Do not take me serious.....:-)
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Old 1st April 2014, 06:06 PM   #5
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Originally Posted by generg View Post
It is the click, clunk when the amp goes from class A to AB, many people already wrote about this phenomenon to Nelson.....

Do not take me serious.....:-)
Ah yes! The special class A part kicking in and out.
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Old 1st April 2014, 09:36 PM   #6
wayne is offline wayne  United States
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This is just thermal expansion of the heat sinks and the transistor rails. It is normal but you can tighten the heat sinks with a 5/32" hex head.
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Old 2nd April 2014, 05:41 AM   #7
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Thanks for all your replies.

The sound is only coming form the amp, and not the speakers.

Explanations about thermal expansion of heat sinks makes sense. Will try and tighten screws around heat sinks.

Cheers,

Glenn
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