04-02-2016, 07:39 PM
I had a bad heater winding in my HRO power supply. A few things I noticed. Transformer got hot, after it was running for 15 mins you couldn't touch it. Smelled like it was burning. Heater voltage would vary from 3v up to the normal 6.3v. Had some 60cy hum that could be quenched by connecting an earth ground but there was a fair amount of sparking when connecting the ground wire.
If you do find that it's bad it may be cheaper to have a custom one made or rewinding your old one as Hammond are costly. Unfortunately with a set that has 2.5v tubes it really limits the possibilities for replacement. A transformer out of a 70 has the voltage but I don't think it will make enough current.
Terry
If you do find that it's bad it may be cheaper to have a custom one made or rewinding your old one as Hammond are costly. Unfortunately with a set that has 2.5v tubes it really limits the possibilities for replacement. A transformer out of a 70 has the voltage but I don't think it will make enough current.
Terry
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