I acquired a fully functional Technics SA-TX50 receiver. It works perfect. The issue i have is there was buzzing coming from the inside of the unit, during higher volume levels. I opened the unit, and determined the fan is pulsating with the sound level. It is the physical pulsing of the fan speedi up and slowing down instantaneously with the beat of the music. It is not driven by vibration, as i have only headphones connected. It seems the fan is tied to the output of the output transistors. As the vu meters go up and down, so does the pulsing of the fan. Is this a filter capacitor problem, a power supply issue, or just a worn out fan? Thanks. rod.

SOURCE: Technics SA-DX940

Ratnesh, I have this same receiver and the fan only comes on at certain volume levels. Unfortunately I now live in an apartment and can very rarely listen to it that loud. I had the same problem for a little while until I thought about moving the receiver to the lowest shelf with nothing on top of it. This seems to have worked so far although it does still get quite warm. Good luck!

SOURCE: technics sa-ex300 says overload ?

it could be overheating - try aiming a fan at it for a while, see if the problem stops.

SOURCE: SA TX50

steve4trace on jul 8,2008
UNPLUG the receiver from the outlet. Take cover off. See the circuit board to the right of the dial (front facing U) behind the glass window. The bottom of those circuits are connected by pins that fit the other circuit board. Press them together or tie that corner safely to the back end using non-electrical wire (use poly-twine). When you do this you will not be able to put the cover back on. You will have to leave it exposed. If you like your receiver that much like I do - this is the solution I found. Put the receiver back where it is protected (from kids, juices, water, etc.) and enjoy your surroundsound again. You might have to do that to the other side. It worked for me. Use common sense when looking. Good luck.

SOURCE: I have an old Technics

Reliance on the remote instead of walking across the room to touch the unit will not solve anything. On many receivers, Muting is cancelled if the volume knob is turned to a louder level. Try that.

There's a used original remote for $12 delivered on eBay right now.

http://cgi.ebay.com/Technics-RAK-SA301P-Audio-Remote-Tuner-TV-VCR-CD-/230644267386?pt=LH_DefaultDomain_0&hash=item35b378397a