kevinkr,
Agreed. Safety first.
It is true that there are different power systems, and ground systems, etc. around the world. However, when products and electronic devices can come into contact with unsuspecting consumers, there needs to be some measures taken to assure safety. Putting an amplifier high up in a locked cabinet does not help if the loudspeaker connections are easy to reach.
Agreed. Safety first.
It is true that there are different power systems, and ground systems, etc. around the world. However, when products and electronic devices can come into contact with unsuspecting consumers, there needs to be some measures taken to assure safety. Putting an amplifier high up in a locked cabinet does not help if the loudspeaker connections are easy to reach.
After hours of usage with the secondary grounded, the amp finally blew a fuse and the primary now has shorted to secondary causing a severe load. Before blown fuse, I noticed the high frequency was rolled off. Essentially the output transformer is a faulty unit.
For safety reason, it is best to ground the secondary, even in a non-feedback design!
Sorry to hear. That sucks.
Failure of the insulation most likely.
I had a Marantz 8B output transformer sorting the primary to the core, so to chassis.
Only one primary PT fuse in this amp.
It took down the channel power tubes, the PS choke (nice caramel smell) and the secondary PT HV winding (not entirely but the PT was idling at 35W with no load).
Not fun. Since then, I always fuse the HV rail.
Failure of the insulation most likely.
I had a Marantz 8B output transformer sorting the primary to the core, so to chassis.
Only one primary PT fuse in this amp.
It took down the channel power tubes, the PS choke (nice caramel smell) and the secondary PT HV winding (not entirely but the PT was idling at 35W with no load).
Not fun. Since then, I always fuse the HV rail.
this is a 25 watt 5k/8 ohm SE OPT i made...
capacitance between primary and secondary is 6747pf...
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