Author Topic: Are used power transistors from Ebay China real? Fake?  (Read 6208 times)

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Offline Radio Tech

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Are used power transistors from Ebay China real? Fake?
« on: November 20, 2015, 09:59:20 am »
Got home real late and found a few packages in my mail, so decided to burn the midnight oil to see if they are any good.

In this video we have a Kenwood ts-2000 that has a blown 2sc5125. No longer available I ordered a refurbished transistor from China. Are they real? Fake? Lets see.






2SC2782 replacements
https://www.rfparts.com/rftransistors/transistor-2sc/transistor-2sc-2500-2999/2sc2782.html

Lilly Electronics Ebay
http://www.ebay.com/itm/251474805053?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT



Offline Shock

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #1 on: November 22, 2015, 03:58:20 am »
Really enjoy your videos, would love to see some more repair videos using the schematic like you did on the Heathkit IG-1271 repair, I think beginners could learn a lot from these as often the troubleshooting side of things is left out.
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM       >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Online blueskull

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #2 on: November 22, 2015, 04:47:15 am »
Usually refurbished or old RF parts from China are authentic, but be extremely careful with power switching devices.
Some switching transistors are salvaged in a horrible fashion -- fry PCB with oil, and let the parts pop off.
 

Offline Radio Tech

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #3 on: November 22, 2015, 05:37:29 am »
Really enjoy your videos, would love to see some more repair videos using the schematic like you did on the Heathkit IG-1271 repair, I think beginners could learn a lot from these as often the troubleshooting side of things is left out.

Thank you very much. I am please you like them.
I have plenty of stuff to make videos on. And some will get into some troubleshooting on the white board.
I just uploaded part one of a repair that will require quite a bit trouble shooting.

https://www.eevblog.com/forum/other-blog-specific/14-kenwood-ts-50-capacitors-and-previous-repairs-gone-bad-part-1-evaluation/new/#new


Usually refurbished or old RF parts from China are authentic, but be extremely careful with power switching devices.
Some switching transistors are salvaged in a horrible fashion -- fry PCB with oil, and let the parts pop off.

I saw something about that a few weeks ago. Nasty stuff and very unhealthy to the ones doing it.

Offline Shock

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #4 on: November 22, 2015, 07:37:31 am »
Is the oil used for desoldering PCBs or was it Polychlorinated Biphenyl (such as cooling fluid) aka PCBs, which they sell as toxic illegal cheap cooking oil for fast food.

The soldering pot, fire or hot air method seems easier.
 




« Last Edit: November 22, 2015, 07:39:41 am by Shock »
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM       >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Offline SeanB

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #5 on: November 22, 2015, 07:58:14 am »
PCB oil is still probably better than Gutter oil. Look at your peril, you will never eat street vendor food again.
 

Online Circlotron

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Re: Are used power transistors from Ebay China real? Fake?
« Reply #6 on: November 22, 2015, 08:41:11 am »
Sitting on the ground = ESD safe workstation...
 


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