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Old 6th December 2015, 12:28 AM   #1
kuer is offline kuer  Canada
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Default What does it mean by "leaky"?

If somebody says these output transistors got leaky, does it mean something like liquid coming out of the transistor? or any other meanings?

Actually I checked my transistors, it looks perfect physically.

I need some advice.

Thank you very much.
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Old 6th December 2015, 12:30 AM   #2
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Can you give a more clear example of what you're asking?

The closest thing I can get to your question is gate leakage on a MOSFET.
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Old 6th December 2015, 12:41 AM   #3
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I believe you're referring to the propensity of early semiconductors, particularly germanium, to pass some current when they're not supposed to, it has nothing to do with physically leaking fluid or anything else. Modern semis don't have this issue.

Mike
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Old 6th December 2015, 12:44 AM   #4
rayma is online now rayma  United States
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Quote:
Originally Posted by kuer View Post
If somebody says these output transistors got leaky, does it mean something like liquid coming out of the transistor?
That refers to current, not fluid. When p-n junctions are reverse biased and should be off, they have a certain small "leakage current"
that can drastically increase with damage, or improper operation.
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Old 6th December 2015, 12:47 AM   #5
kuer is offline kuer  Canada
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Quote:
Originally Posted by Derfnofred View Post
Can you give a more clear example of what you're asking?

The closest thing I can get to your question is gate leakage on a MOSFET.
Thank you for your quick reply.

My marantz receiver 2235b works, but only for 20mins from cold start, it is overheated on the heatsink. If I don't close the cover, seems working with no issue.

Found that one of output transistors is very hot. now I am buying new transistors, not received.

Actually I measured all transistors, should be good according to the testing method.

Checked online, somebody says the transistor is "leaky", don't undersand this word at all.
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Old 6th December 2015, 12:52 AM   #6
kuer is offline kuer  Canada
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Quote:
Originally Posted by rayma View Post
That refers to current, not fluid. When p-n junctions are reverse biased and should be off, they have a certain small "leakage current"
that can drastically increase with damage, or improper operation.
Yes, thanks. another issue is that when turning on or off, there is a pop sound on one speaker, guss the same cause. First step, I will replace transistors.
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Old 6th December 2015, 12:53 AM   #7
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Kuer--I think the other two posters are going to get you along the right direction. Sounds like there's a bias problem (which would mean that the output transistors are conducting beyond what they normally should, i.e. leaky)
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Old 6th December 2015, 12:56 AM   #8
kuer is offline kuer  Canada
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Quote:
Originally Posted by Derfnofred View Post
Kuer--I think the other two posters are going to get you along the right direction. Sounds like there's a bias problem (which would mean that the output transistors are conducting beyond what they normally should, i.e. leaky)
The problem is that the bias cant be adjusted much, very high voltage, forget it. No way to adjust correctly.
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Old 6th December 2015, 12:56 AM   #9
kuer is offline kuer  Canada
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Quote:
Originally Posted by Michael Bean View Post
I believe you're referring to the propensity of early semiconductors, particularly germanium, to pass some current when they're not supposed to, it has nothing to do with physically leaking fluid or anything else. Modern semis don't have this issue.

Mike
Ok, thanks, understand this. thanks.
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Old 6th December 2015, 05:16 AM   #10
Enzo is offline Enzo  United States
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There is the measure of the normal leakage current as described above by others. But a transistor can also fail in a way that allows current to flow when it should not, and we refer to that as a leaky transistor.
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