cmpat
New Member
Hi Everyone,
I picked up a Fisher 450T from the thrift store a while back and am just getting around to looking at it. Upon powering it up, I get what sounds like normal audio. But after a few seconds the source fades out and a hum fades in, and I can't hear the music anymore. I replaced the large caps in the power supply with no change. Looks like one pair of output transistors is original Motorola and the other pair has been changed to a pair labeled SYL ECG.... Could mismatched outputs cause this behavior? Also I can't seem to find any info or cross reference for those Motorola, labeled 02060-7 and 01060-7. Does anyone have a suggestion there? My only test equipment at this time is a DMM, so any trouble shooting help would be appreciated. Thanks.
I picked up a Fisher 450T from the thrift store a while back and am just getting around to looking at it. Upon powering it up, I get what sounds like normal audio. But after a few seconds the source fades out and a hum fades in, and I can't hear the music anymore. I replaced the large caps in the power supply with no change. Looks like one pair of output transistors is original Motorola and the other pair has been changed to a pair labeled SYL ECG.... Could mismatched outputs cause this behavior? Also I can't seem to find any info or cross reference for those Motorola, labeled 02060-7 and 01060-7. Does anyone have a suggestion there? My only test equipment at this time is a DMM, so any trouble shooting help would be appreciated. Thanks.