Hello
I am trying to fix a classe amp which uses a LME49810, to my dismay, the only sources I find are chinese sellers on e-pay, I bought two of them(different sellers), which don't work, sink and source outputs goes to V-, I found no shorts, I am sure that the amp is not workig due this chip.
if this chip is so marvelous, why has it been discontinued ? and where can I buy one that has no doubts of being genuine ?
thank you
I am trying to fix a classe amp which uses a LME49810, to my dismay, the only sources I find are chinese sellers on e-pay, I bought two of them(different sellers), which don't work, sink and source outputs goes to V-, I found no shorts, I am sure that the amp is not workig due this chip.
if this chip is so marvelous, why has it been discontinued ? and where can I buy one that has no doubts of being genuine ?
thank you
If possible, check your rail voltages, and try a 7293 / 94 chip instead of chasing a mirage.
The 49810 was good to 200V, and not very common, and it seems TI decided to drop it after acquiring NS, or maybe NS introduced a later model. TI does not make them.
Worst case, new transformer, and Class D power section in place of the 49810 based power section.
Or find a populated amp board with transistors, such boards are common, the highest I have seen are good for 52-0-52 V supply here in India.
The 49810 was good to 200V, and not very common, and it seems TI decided to drop it after acquiring NS, or maybe NS introduced a later model. TI does not make them.
Worst case, new transformer, and Class D power section in place of the 49810 based power section.
Or find a populated amp board with transistors, such boards are common, the highest I have seen are good for 52-0-52 V supply here in India.
You will have to do some wiring to the chips, pin outs may not be the same.
Move them higher on the heat sink, use wires from pins to PCB.
Move them higher on the heat sink, use wires from pins to PCB.
To the OP...
Have you read all the correct (i.e. TI's own) advice on this long-standing and universal chip obsolescence problem? As I see it, manufacturers who adopt a particular chip have to support it by selling lots of amplifiers to build a long-term demand but if their products don't sell enough units for some reason (chipamp based products are not generally perceived as high quality), then production stops and the chip soon fades into obscurity. It's just commercial reality for any chip manufacturers who offer low-cost devices for consumer goods, no matter how special or superlative they actually are.
I would be chasing Classe for advice, if possible, as product support is really their problem, even though its an old issue.
https://e2e.ti.com/support/audio-gr...49811-49810-49830-and-lme49880-49990-obsolete
Have you read all the correct (i.e. TI's own) advice on this long-standing and universal chip obsolescence problem? As I see it, manufacturers who adopt a particular chip have to support it by selling lots of amplifiers to build a long-term demand but if their products don't sell enough units for some reason (chipamp based products are not generally perceived as high quality), then production stops and the chip soon fades into obscurity. It's just commercial reality for any chip manufacturers who offer low-cost devices for consumer goods, no matter how special or superlative they actually are.
I would be chasing Classe for advice, if possible, as product support is really their problem, even though its an old issue.
https://e2e.ti.com/support/audio-gr...49811-49810-49830-and-lme49880-49990-obsolete
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https://octopart.com/search?q=lme49810¤cy=USD&specs=0
I don't know if the suppliers that are found by this search are trustworthy, but I think it is likely, and at least a good start
I don't know if the suppliers that are found by this search are trustworthy, but I think it is likely, and at least a good start
Thank you for all your replies. The amp I am trying to fix is a classè CA5300, a 5 channel beast. one channel is gone, all output power transistors were shorted, and a blown LME49810. I checked with classè and they sell me a new board for a hefty $1,200 usd. I have to make a decision to buy another chip, or taking the expensive option, which leaves me full of doubt after reading the obsoleescence post and the fake market..
Indeed, I find it absurd to have a 5 channel of 300 watts (1hz to 80,000) oh well... the amp is not mine, I am trying to repair it.
49810 is good. But it is only suitable for beginners.
It doesn't mean much to professional people.
We can replace it with a triode. And the performance is also good.
For example, l20se designed by me. I have tested better performance than LME49810.
49810 is only a voltage amplifying IC. It is not a complete amplifier.
The performance of the 49810 made by most people is lower than that of the IC.
It doesn't mean much to professional people.
We can replace it with a triode. And the performance is also good.
For example, l20se designed by me. I have tested better performance than LME49810.
49810 is only a voltage amplifying IC. It is not a complete amplifier.
The performance of the 49810 made by most people is lower than that of the IC.
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I need to buy 2 LME49810 as soon as possible. I have a Classe CA-5300 that I am repairing 2 amp boards on. I am an authorized service center. Please contact me at jason@electroniclaboratory.com or jason1238@bellsouth.net asap!!!
I currently have a Classe CA-5300 that has 2 bad amplifier boards that I am repairing. I need 2 LME49810 IC's ASAP. The boards also have several bad outputs, a shorted 82v zener diode, and driver J253. Maybe we can help each other. Please contact me asap..Jason1238@bellsouth.net.
I am an authorized service center for Sound United.
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@Jasliz
Why don't you place an ad in Swap Meet - https://www.diyaudio.com/community/forums/swap-meet.2/Please don't repeatedly post to regular threads for this type of transaction.