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I have a gemsound surround sound amplifier. what sound transistors does it take, de ones on de amplifier is d998 and b778, is it de correct transistors

It,s a surround sound amplifier av 316.i replaced transistors but de sound is very scratchy.

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SOURCE: gem sound exa-3950

check the rca's for a short

Posted on Jul 04, 2009

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I Think that something like a transistor is getting hot and then shutting down. Exploring inside might solve the problem of what's getting really hot. You could even get some Servisol Freeze Spray, and wait for it to go off then spray it on the suspected part. That will cool it down and it should start up again. If it does come on, that part will have to be replaced.

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A diode/rectifer or voltage stabliser, or leaky capacitor in the power supply.
Also the main transistors in the power amp or if it has an output IC - that!
If you can in anyway disconnect the power supply section from the amp circuit, you can isolate which part is faulty. For if it blows when disconnected from the power amp, you know it's just the power supply that's gone. And if it does not blow - then it's the amp!

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Hi...
If it's a straight-up power switch then it will need to be replaced if it works off a relay then the relay is gone.

website

http://www.gemsound.com/contact.html#


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Manual


Contact Gemsound thru their email.

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I have a TEAC AG-H300MKIII which i purchased last May 2007. It has been working without problem for a year and now i find that it seems to have no power, it simply will not switch on. I have changed the...


Your output transistors have blown causing the internal thermal fuse in the power supply to fail as well, if you get time to see both output chips models B778 / D998 on the heatsink they need replacing, the thermal fuse can be bypassed by a qualified technician.

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