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Old 6th May 2013, 07:54 AM   #1
Astig is offline Astig  Philippines
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Default SAP 15

Good day everyone, I bought a Guitar amp China made, now its not working. I open it and found two SANKEN parts that blows. SAP 15N/SAP 15P. I'm about to replace this two SANKEN but I could not found it anywhere. If anyone knows please help me find a replacement or an equivalent parts of SAP 15N/SAP15P. I would gladly appreciate such help as this.
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Old 6th May 2013, 08:11 AM   #2
Mooly is offline Mooly  United Kingdom
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Isn't the SAP16N/P a replacement ?

Dalbani list them.
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Old 6th May 2013, 08:28 AM   #3
Astig is offline Astig  Philippines
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Yes, SAP16P/N can be a replacement; but neither of the SAP 15/16 can't be found here in my place.I thee be any replacement other than SAP I love to hear.
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Old 6th May 2013, 10:58 AM   #4
JMFahey is offline JMFahey  Argentina
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Well, either you will have to order a pair from another Country *or* you will have to reform the amplifier circuit.
But you need to post the schematic if you need any help.
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Old 6th May 2013, 12:02 PM   #5
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Default SAP15

Is this what you are looking forClick the image to open in full size.
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Old 7th May 2013, 07:36 PM   #6
tinitus is offline tinitus  Europe
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curcuit error ?
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Old 7th May 2013, 11:01 PM   #7
JMFahey is offline JMFahey  Argentina
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Don't think there's a "second source" replacement.
After all it's just a couple transistors with the bias diodes built in (good) , and if I don't remember wrong, also the ballast resistor (BAD , who needs an extra heat source just a millimeter from the chip, if not on the chip itself?)

If I had it on my bench in Buenos Aires I would use a couple good, similar or better specs power transistors, and add some bias sensor (diodes or VBe multiplier) and an external couple wirewound resistors.

But to offer any more precise help, we need a schematic, so get a good pair of glasses, pencil, paper, and some coffee or tea and start drawing.

At least the power transistors, their drivers, and the predriver stage, a.k.a. Vas stage, plus any short protection.

Or try to get some friend's international credit card and order them from Babani or similar source. EBay not recommended, at all.
You will have no Customs problems with such a small order.
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Old 9th May 2013, 08:35 AM   #8
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To be honest, it would be a lot less hassle to just replace the devices like for like. The SAP15 is a darlington device and not only does it have a bias tracking diode built in, it also has an emmitor resistor arrangement.
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Old 20th May 2013, 01:45 PM   #9
Astig is offline Astig  Philippines
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Thanks a lot to all of you guys, just one more question. Would it be good, if I build the whole amp driver? Would it not affect the pre amp? Is this good or bad Idea?
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Old 20th May 2013, 03:04 PM   #10
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One of the problems noted in the SAP datasheet was that the emitter resistor wasn't sufficiently robust. You can use the STD03N STD03P -- and use a separate emitter resistor. The latter are available from Allegro Micro or sometimes on EBay.
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