Could someone keep me from being committed? I am replacing the output/power transistors on a yamaha rx v2092...the originals are Sanken c4512 (4 of them)
and JRC-- 79m12a, 78mo5A, 79mo5a and 7812A...
All I can locate by cross referencing are parts by NTE...anyone know if NTE
is OK to use- quality and spec wise???
Heck, even the sanken website doesn't show the 4512...WTF??? And JRC is apparently long gone...
and JRC-- 79m12a, 78mo5A, 79mo5a and 7812A...
All I can locate by cross referencing are parts by NTE...anyone know if NTE
is OK to use- quality and spec wise???
Heck, even the sanken website doesn't show the 4512...WTF??? And JRC is apparently long gone...
The JRC-- 79m12a, 78mo5A, 79mo5a and 7812A are all Voltage regulators .....
Look up:
LM7812 (replace for jrc7812a) ..... Positive 12v voltage regulator
LM7912 (replace for jrc7912a) ..... Negitive 12v voltage regulator
LM7805 (replace for jrc78mo5A) .... Positive 5v voltage regulator
LM7905 (replace for jrc79mo5a) .... Negitive 5v voltage regulator
As for the Sanken Power transistors I have no idea what a good replacement would be but you might be able to find some NOS sankens if you look arround ......
Good luck
Look up:
LM7812 (replace for jrc7812a) ..... Positive 12v voltage regulator
LM7912 (replace for jrc7912a) ..... Negitive 12v voltage regulator
LM7805 (replace for jrc78mo5A) .... Positive 5v voltage regulator
LM7905 (replace for jrc79mo5a) .... Negitive 5v voltage regulator
As for the Sanken Power transistors I have no idea what a good replacement would be but you might be able to find some NOS sankens if you look arround ......
Good luck
B&D Enterprises has Sanken 2SC4511 in stock for $3 each. That should sub for the 4512. I have always had good results with them for my Sanken purchases. That sub would certainly be closer than whatever NTE is hawking.
B&D Enterprises - Electronic Components Distributor
Sanken no longer lists 4512? Yeah well, General Motors no longer lists the 1989 Buick. Parts come and go. A lot of formerly popular TO3 transistors are fading away as the similar parts in TO247 package are taking over, for example. If the demand for a particular part dies away, Sanken will stop making it.
I use NTE for absolute emergencies only. They are not the same parts as the originals, they are what NTE says is "close enough" from their inventory of parts. In high powered amps for pro audio, it is important that a row of power transistors all work the same so they share current evenly. SOme NTE part might be equivalent specs, but may not share current well nor track thermally. So I am not saying the NTE parts are junk, but they would be better if you replaced the whole stage full with them, rather than just replace a few parts. At least then they would all be the same.
But the other main concern is that NTE transistors tend to cost 3 to 10 times the cost of the "real" parts. Why spend $12 for a $3 transistor?
JRC - Japan Radio Corp, is now NJR - New Japan Radio. They are still around.
As MInion points out those 7812 etc are voltage regulators. 7812 etc are generic industry numbers, you can find them in many brands. I'd be hard pressed to find a reason brand mattered on those in a consumer receiver.
7805 is a regultor for 5v, the 78M05 is also, but is a slightly lower current part. You can use a regular 7805 in place of a 78M05 if you like. There are also 78L05 for even lower currents. Of course with the M versions all still readily available, you can easily get the exact parts.
B&D Enterprises - Electronic Components Distributor
Sanken no longer lists 4512? Yeah well, General Motors no longer lists the 1989 Buick. Parts come and go. A lot of formerly popular TO3 transistors are fading away as the similar parts in TO247 package are taking over, for example. If the demand for a particular part dies away, Sanken will stop making it.
I use NTE for absolute emergencies only. They are not the same parts as the originals, they are what NTE says is "close enough" from their inventory of parts. In high powered amps for pro audio, it is important that a row of power transistors all work the same so they share current evenly. SOme NTE part might be equivalent specs, but may not share current well nor track thermally. So I am not saying the NTE parts are junk, but they would be better if you replaced the whole stage full with them, rather than just replace a few parts. At least then they would all be the same.
But the other main concern is that NTE transistors tend to cost 3 to 10 times the cost of the "real" parts. Why spend $12 for a $3 transistor?
JRC - Japan Radio Corp, is now NJR - New Japan Radio. They are still around.
As MInion points out those 7812 etc are voltage regulators. 7812 etc are generic industry numbers, you can find them in many brands. I'd be hard pressed to find a reason brand mattered on those in a consumer receiver.
7805 is a regultor for 5v, the 78M05 is also, but is a slightly lower current part. You can use a regular 7805 in place of a 78M05 if you like. There are also 78L05 for even lower currents. Of course with the M versions all still readily available, you can easily get the exact parts.
Thanks for you help...it allowed me to get this thing working...paid $20 for the Rx V2092...
$12 in parts and it's up and running...sound pretty good, too...thanks again
$12 in parts and it's up and running...sound pretty good, too...thanks again
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