homeskillet
New Member
Was at a local thrift store the other day. Found a 220t and a 440t, both for $5.98 a piece! The 220 sings! All of it's functions seem to be in good working order, a DC bias of under 10mV on both channels (7 left and 8 right)
The 440 is a different story, did a bias check and the meter read 2V!! after a quick sweep with the oscope i got a clean sine wave at the speaker out terminals. I hooked up some cheap rca speakers, and almost no audible sound comes out. I took the panels off and the large electrolytics all seem to be ok, smooth tops, no weird cracks/leaks. My next plan is to go through and check all the small transistors as some offered interesting buzzes (through the speakers) when probed. If anyone can suggest a place to find a digital copy of the service manual and replacement knobs for the 440 it would be much appreciated!
I will be posting photos soon.
The 440 is a different story, did a bias check and the meter read 2V!! after a quick sweep with the oscope i got a clean sine wave at the speaker out terminals. I hooked up some cheap rca speakers, and almost no audible sound comes out. I took the panels off and the large electrolytics all seem to be ok, smooth tops, no weird cracks/leaks. My next plan is to go through and check all the small transistors as some offered interesting buzzes (through the speakers) when probed. If anyone can suggest a place to find a digital copy of the service manual and replacement knobs for the 440 it would be much appreciated!
I will be posting photos soon.