| adrome00 |
I'd been trying to fix a quasi-complementary paralleled 4 device output, 400 W amp which probably babies the 2sd424's. After tremendous amount of work, perplexity, and smoke (the kind with acetylene-like puffs of carbon!), I finally decided to actually test the last couple of 424's I had.
Oh, they easily did 50 Watts at 6.5 amps, alright. But then I put 120 volts across one, and couldn't get past around 150 mA before it blew the 3 A fuse I had on it!
It shorted.:eek:
They read Toshiba 2sd424; a little alcohol took the print off very easily. I notice some high-power TO-3 's have rather thin mounting bases: the bases on these were quite thick, but all-steel construction. I guess they could have been 2N3055's.
Does anyone have suggestions what to tell the supplier when I inform them of their product? Has anyone gotten money back for this type of thing?
I'm interested in any comments on how to try to avoid counterfeit transistors, and what to do about it when you do get some. |
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| jackinnj |
| in the states, a big supplier like Avnet will take back devices up until 30 days after sale. |
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| adrome00 |
Hi Jackinnj
I had trouble finding these older transistors: a very small company.
(PS. How's the weather up there? I used to live in Morristown) |
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| jackinnj |
| beautiful and clear today -- the tomato crop is starting to come in -- i'm in Short Hills and know Morristown well |
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