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If you imply an AC voltage transformer by saying "power supply", I don't believe it will be difficult to find one. If you stay in Istanbul, I recommend that you go to "Dogubank". You can choose from a wide variety of options at that place. All you have to pay attention is that the AC frequency (Hz) of the transformer you're about to purchase. It must be around 50Hz to operate your amp.
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In general, it is NOT recommended to operate an appliance 50hz-to-60hz OR 60hz-to-50hz UNLESS the manufacturer specifically says it can do it.
Additionally, you must also account for the voltage (110V vs 220V), which you have not indicated.
Therefore, it is best to get your exact model number and contact the manufacturer, but get ready for disappointment. The larger and more complex the electronic device, the less compatible it is.
The Mainboard on the TX SR804 is falty and i just fixed two units with this solution and it bullet prof un der the HDMI board you will find the mainboard stating up right with its back facing the preamp board and it has 3 screws that secure the mainboard to the system 2 on the middle top of the receiver and one on the right side just under the screw you removed for the HDMI board that secures it to the Audio processor board.
Once the screws have been removed pry the board back going from left to right and slowly disconecting the board. THE FIX. once infront of you clean all of the ribom connectors and the and bend the pins on the connector P954A, P959A , P2005A and P2004A THESE CONECTORS ARE THE REASON THE SYSTEM WILL SHUT DOWN SPECIALY THE FIRST TWO. I ALSO RECOMEND PUTING A INTERNAL FAN POINTING TO THIS BOARDS KEED THE HEAT DOWN. the reason the SUB is low or the HDMI does not seem to work well they are related to the SIF connectors on the the are 4 on this board and i used a thin bud hard plastic and inserted bering each sif cable to push the pins againt it. this is a 20 minute job and you amp will be fixed. i fixed many like this. Have a wonderfull holiday. Mvianna
I have the same receiver and the way to fix is simple. in the main board of this unit there are 5 connectors and they slide into other components like Lego. the issue is the king of material they are made of it's cheap. if you reseat the mainboard it will fix it for a day or two, them it will start again. the easyway is to re seat the board and put a fan inside of the receiver between the transformer and the inside of the amp pointing down about 20 degrees connect the fan to a ajustible voltage adapter and connect it to the outlet in the back of the unit. so it comes on when you turn it on. this voltage adapter is cheap. the adapters people buy for phones and or MP3's at Radio shack or Best buy it goes from 1.5v to 12 volts/ this way you can control how loud the fan is in side the receiver. i find 4.5V does the trick. The connectors on this board start to loose contact with some of the pins when heated. the fan keeps it cool enouth to fix the issue. I fixed manny these ONKYO 804's this will fix it. you just have to do it. the main board is inder the HDMI board in a Vertical position running from one side to almost the Power supply. it has 2 screws also holding it in the inside middle back of the amp. Becarefull with these amps 75 V at 23amp's DC is no joje leave it off for a couple of hours to satart working on it. Good luck.
Check the rated impedance of your speakers. Use the manufacturer's rating. Don't try to measure it with an ohmmeter. This should be printed on the rear panel. If not, check your manual if you have one. The receiver probably shouldn't be connected to speakers rated any lower than 6 Ohms. If the speakers are 6 or higher, check your wires and connections for any stray strands that could be causing a short. I also have to wonder what "increase the volume substantially" means. Are we talking potential hearing damage? Maybe the receiver is saving you from your self.