65n06 from ebay - fake? - diyAudio
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Old 6th August 2015, 08:46 PM   #1
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Default 65n06 from ebay - fake?

Hello.

I bought one fet in ebay-link china, as was immposible to buy it in my country.
But for me looks like fake?
Anyone can confirm?

1."fake"
2.original
3. fake in middle of original - to compare
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File Type: jpg fake.jpg (198.1 KB, 72 views)
File Type: jpg org.jpg (133.9 KB, 73 views)
File Type: jpg middle.jpg (791.8 KB, 74 views)
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Old 6th August 2015, 08:58 PM   #2
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Break them open and look at the size of the die.

If you have a capacitance meter, measure the capacitance from gate to drain and gate to source and compare to originals.

I'm assuming that you purchased more than one so that you could replace all of the FETs in the power supply.

It's generally good to use exact replacements but when you cannot buy from a reputable distributor it may be better to use a substitute that you can buy from a reputable distributor.
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Old 7th August 2015, 06:37 AM   #3
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I will do measure, i bought only one as only one was burned + gate resistor and amplifier still working correctly.
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Old 7th August 2015, 12:32 PM   #4
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There are typically 2 banks of FETs driving the two primary windings. Let's assume that there is an amp with 3 FETs in each bank. All need to share the current load equally. If you have one of three that needs to be replaced, you, at the very least, should replace the other two that were in the bank with the failed one. It would be better to replace all 6 in the supply but that's not as important as replacing the two in parallel with the one that failed.

The cost of the FETs is typically insignificant compared to the time it takes to re-repair an amp if it fails because the FETs weren't matched closely enough. Using FETs with the same part number isn't close enough when parts are working in parallel. Typically, they should all be from the same production batch with matching date codes.
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Old 7th August 2015, 12:35 PM   #5
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Buying from E-Bay is a bit of a gamble, I buy a lot from there but steer well clear of Chinese suppliers.
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Old 7th August 2015, 01:11 PM   #6
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Quote:
Originally Posted by KatieandDad View Post
Buying from E-Bay is a bit of a gamble, I buy a lot from there but steer well clear of Chinese suppliers.
Even FETs from the same batch can vary wildly. In an application that requires current sharing they need to be matched under the conditions that they will endure under use.
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Old 12th August 2015, 09:51 AM   #7
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It was fake, this seller has many negatives comments about his goods..
I've found this FET in UK distributor,and wasn't so expensive.
And it looks like very similar like old original ! Never more china electronics elements
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