I just fixed, yesterday..a Sony Xplod amp...the only thing wrong with it was a copper rail...in the power supply section had a bad solder joint...I have always found this in all electronics by looking with a jewelers loop...or a 50 mm camera lens I use a a magnifying glass...
And another way was to turn it on...in total darkness...and move around..or touch components with something non conductive until you hear a crack...or a spark and then see were it came from...
Kenny
And another way was to turn it on...in total darkness...and move around..or touch components with something non conductive until you hear a crack...or a spark and then see were it came from...
Kenny
I know of no modern amps that still use bipolar transistors in the power supply. Most use FETs.
Changing the transistors alone won't do much to increase the power output.
Changing the transistors alone won't do much to increase the power output.
The 2SD998 may work for the NPN of the pair but the same thing applies to the originals, out of production and likely counterfeit.
So let me get this straight...the output transistors do NOT determine the power output...then what does?
Kenny
Kenny
Just curious..can you use home stereo transistors...??? or car stereo cd players...with the amp built in..will it use this same transistor.??? sorry for so many questions..
Kenny
Kenny
Home transistors typically are higher voltage, lower current than the ones used in car amps.
I recommended the only transistors that I'd expect to work reliably.
The total power output is determined by a lot of things but mainly the rail voltage and the load driven. The rest of the components have to be able to handle the current and power dissipation for the given rail voltage and load.
I recommended the only transistors that I'd expect to work reliably.
The total power output is determined by a lot of things but mainly the rail voltage and the load driven. The rest of the components have to be able to handle the current and power dissipation for the given rail voltage and load.
OIC...so what happens to all the old school amps laying around..I guess just like computers...they get scrapped and taken apart then make it to the landfill...ewaste...what a shame..There has to be someone in the usa that has these trans...
Kenny
Kenny
PacParts may be able to get them. They don't have them listed as discontinued but they're about $20 each. Add about $10 for shipping.
Consumer Electronic Parts and Accessories at PacParts, Inc.
Sometimes you have to find replacements that will work. Sometimes you scrap it. If the amp is valuable, you may keep trying newly developed transistors to see if you can find something that works if nothing is currently available. The transistors that I suggested work in the place of most of the output transistors with Japanese part numbers.
Consumer Electronic Parts and Accessories at PacParts, Inc.
Sometimes you have to find replacements that will work. Sometimes you scrap it. If the amp is valuable, you may keep trying newly developed transistors to see if you can find something that works if nothing is currently available. The transistors that I suggested work in the place of most of the output transistors with Japanese part numbers.
I can get some 2sa1694...that is close..but sometimes one number off..could mean it wont work..dont know about these..
Kenny
Kenny
Is this company ok...from the far east..Alibaba, they are saying they have these parts..at $1.08 each..seems cheap..and like you said...maybe counterfeit..right?
Hi so should I replace both of the same type..or number..or can i mix them...?
and which one should I use the 1671 or the 4368?
Thanks Kenny
and which one should I use the 1671 or the 4368?
Thanks Kenny
You cannot have the same part number in both locations. You have to have one NPN transistor and one PNP transistor.
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