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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Fake or substandard STK parts?
OK, here's the thing.
Genelec 8050A powered speakers use the Power Amp module STK 442-130. I have had 2 customers bring me 3 of these for repair. First one, I got a pretty cheap STK 442-130 from Ebay. Here are some: http://www.ebay.co.uk/sch/i.html?_tr...at=0&_from=R40 Trouble is it blew after a couple of days. After posting here and showing some photos, it was deemed by some here that these Ebay ones are not the original Sanyo parts. Maybe not "fake" as such, but sub standard. My second customer said he'd taken his speaker to another repairer, and again the chip kept blowing for no apparent reason. I have sourced 2 of these parts from the Genelec distributor HHB, at great expense, and have not heard anything back from the first customer, the second customers one is still going strong, so maybe these are in fact the "good" ones from the Genelec production line? Unfortunately HHB will not sell these any more, but will sell the complete board at over £200. So, does anyone have any definitive info on these chips, what they are, or what they are not? Cheers, Gareth. |
#2
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Fake or substandard STK parts?
Oh, and I should mention that the Genelec Bass Driver (which is the side of
the chip that always blows, tweeter still works) is actually 4 ohms. Gareth. |
#3
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Fake or substandard STK parts?
"Gareth Magennis" wrote in message
... OK, here's the thing. Genelec 8050A powered speakers use the Power Amp module STK 442-130. I have had 2 customers bring me 3 of these for repair. First one, I got a pretty cheap STK 442-130 from Ebay. Here are some: http://www.ebay.co.uk/sch/i.html?_tr...at=0&_from=R40 Trouble is it blew after a couple of days. After posting here and showing some photos, it was deemed by some here that these Ebay ones are not the original Sanyo parts. Maybe not "fake" as such, but sub standard. My second customer said he'd taken his speaker to another repairer, and again the chip kept blowing for no apparent reason. I have sourced 2 of these parts from the Genelec distributor HHB, at great expense, and have not heard anything back from the first customer, the second customers one is still going strong, so maybe these are in fact the "good" ones from the Genelec production line? Unfortunately HHB will not sell these any more, but will sell the complete board at over £200. So, does anyone have any definitive info on these chips, what they are, or what they are not? Cheers, Gareth. I have had great luck with Dalbani on eBay. Pioneer hybrid outputs for example. A customer blew his up again. Had no choice but to contact seller. They replaced it immediately at no charge and don't bother to send the "defective" back. So I cracked it open, along with the original Pioneer part. Absolutely IDENTICAL inside. Not a fake. Defective customer. Receiver functions to this day after a severe scolding on speaker wires etc. Mark Z. |
#4
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Fake or substandard STK parts?
I have had great luck with Dalbani on eBay. Pioneer hybrid outputs for example. A customer blew his up again. Had no choice but to contact seller. They replaced it immediately at no charge and don't bother to send the "defective" back. So I cracked it open, along with the original Pioneer part. Absolutely IDENTICAL inside. Not a fake. Defective customer. Receiver functions to this day after a severe scolding on speaker wires etc. Mark Z. Ah, that looks promising - their Ebay shop lists both an "Original Sanyo" part and a "Generic" part for less money. Cheers, Gareth. |
#5
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Fake or substandard STK parts?
Gareth Magennis wrote in message
... OK, here's the thing. Genelec 8050A powered speakers use the Power Amp module STK 442-130. I have had 2 customers bring me 3 of these for repair. First one, I got a pretty cheap STK 442-130 from Ebay. Here are some: http://www.ebay.co.uk/sch/i.html?_tr...=STK+442-130&_ sacat=0&_from=R40 Trouble is it blew after a couple of days. After posting here and showing some photos, it was deemed by some here that these Ebay ones are not the original Sanyo parts. Maybe not "fake" as such, but sub standard. My second customer said he'd taken his speaker to another repairer, and again the chip kept blowing for no apparent reason. I have sourced 2 of these parts from the Genelec distributor HHB, at great expense, and have not heard anything back from the first customer, the second customers one is still going strong, so maybe these are in fact the "good" ones from the Genelec production line? Unfortunately HHB will not sell these any more, but will sell the complete board at over £200. So, does anyone have any definitive info on these chips, what they are, or what they are not? Cheers, Gareth. Can you be sure there is not ultrasonic instability develops in the preamp from a batch of duff caps used on the Genelec secondary supply rails say |
#6
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Fake or substandard STK parts?
"N_Cook" wrote in message ... Gareth Magennis wrote in message ... OK, here's the thing. Genelec 8050A powered speakers use the Power Amp module STK 442-130. I have had 2 customers bring me 3 of these for repair. First one, I got a pretty cheap STK 442-130 from Ebay. Here are some: http://www.ebay.co.uk/sch/i.html?_tr...=STK+442-130&_ sacat=0&_from=R40 Trouble is it blew after a couple of days. After posting here and showing some photos, it was deemed by some here that these Ebay ones are not the original Sanyo parts. Maybe not "fake" as such, but sub standard. My second customer said he'd taken his speaker to another repairer, and again the chip kept blowing for no apparent reason. I have sourced 2 of these parts from the Genelec distributor HHB, at great expense, and have not heard anything back from the first customer, the second customers one is still going strong, so maybe these are in fact the "good" ones from the Genelec production line? Unfortunately HHB will not sell these any more, but will sell the complete board at over £200. So, does anyone have any definitive info on these chips, what they are, or what they are not? Cheers, Gareth. Can you be sure there is not ultrasonic instability develops in the preamp from a batch of duff caps used on the Genelec secondary supply rails say No, I can't be 100% sure of anything really, except the 2 speakers with the 2 devices procured from HHB appear to be lasting well. I suspect the problem is substandard devices that are insufficiently specced to run a high power 4 ohm load without melting. Gareth. |
#7
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Fake or substandard STK parts?
On Oct 31, 10:48*am, "Gareth Magennis"
wrote: "N_Cook" wrote in message ... Gareth Magennis wrote in message ... OK, here's the thing. Genelec 8050A powered speakers use the Power Amp module STK 442-130. *I have had 2 customers bring me 3 of these for repair. First one, I got a pretty cheap STK 442-130 from Ebay. Here are some: http://www.ebay.co.uk/sch/i.html?_tr...13&_nkw=STK+44... sacat=0&_from=R40 Trouble is it blew after a couple of days. After posting here and showing some photos, it was deemed by some here that these Ebay ones are not the original Sanyo parts. *Maybe not "fake" as such, but sub standard. My second customer said he'd taken his speaker to another repairer, and again the chip kept blowing for no apparent reason. I have sourced 2 of these parts from the Genelec distributor HHB, at great expense, and have not heard anything back from the first customer, the second customers one is still going strong, so maybe these are in fact the "good" ones from the Genelec production line? Unfortunately HHB will not sell these any more, but will sell the complete board at over £200. So, does anyone have any definitive info on these chips, what they are, or what they are not? Cheers, Gareth. Can you be sure there is not ultrasonic instability develops in the preamp from a batch of duff caps used on the Genelec secondary supply rails say No, I can't be 100% sure of anything really, except the 2 speakers with the 2 devices procured from HHB appear to be lasting well. I suspect the problem is substandard devices that are insufficiently specced to run a high power 4 ohm load without melting. Gareth. I will never do that again. I used to try to save money with questionable parts but after being burned a few times I will never do that again. You're better off to walk away from the job than try to save the customer a few bucks, (or whatever) at your expense. Lenny |
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