As Bob has noted, the FM3 tuner may not be the most high performance tuner out there, but it sure sounds good when set up right. To that end on this unit have started in and replaced all the electrolytic filter capacitors in the power supply, new rectifier, and replaced other (very) weak tubes, cleaned the controls, sockets, tuning cap, etc.
Noticed that I don't have some of the larger values of the coupling caps like .22 in stock, but did change the audio coupling caps w/ a pair of 600 volt sprague 716. Thing is though, the original capacitors show no leakage at full voltage on my eico bridge, so they must be more modern type poly? Should I go ahead and change out the rest, or are these red/brown guys OK? Not sure what year this unit is, the caps replaced are 0.1uf @ 400 volts, brown dipped type marked "GI" ? Looks like it is recommended to bump the value of these up to .22 as well?
Noticed that I don't have some of the larger values of the coupling caps like .22 in stock, but did change the audio coupling caps w/ a pair of 600 volt sprague 716. Thing is though, the original capacitors show no leakage at full voltage on my eico bridge, so they must be more modern type poly? Should I go ahead and change out the rest, or are these red/brown guys OK? Not sure what year this unit is, the caps replaced are 0.1uf @ 400 volts, brown dipped type marked "GI" ? Looks like it is recommended to bump the value of these up to .22 as well?
