Power Transformer and hum?
Posted: Fri Dec 20, 2013 2:05 am
I've designed and build a SE 6L6-GC amp with James iron (mains, choke, output) and although potted I could hear the mains transformer. Just bought a switched mode SE EL84 but the darn thing runs far too hot - after a few hours the thing is so hot that I can not touch it. Iron is OK up to a limit and in first instance want to re-use it. Have had a number of Chinese amplifiers before and those transformers always hum.
Had a couple of PP 4 x KT88 (ea) mono blocks from Korea and you could not hear the transformers. Needed a weightlifter to move them around and it was like having a heater in the room. For background music in my office the EL84 is good enough.
Back to subject: what are the builder's experiences with hum - which transformer would be best? DO I need to go to Sowther or VVT?
Thanks
Had a couple of PP 4 x KT88 (ea) mono blocks from Korea and you could not hear the transformers. Needed a weightlifter to move them around and it was like having a heater in the room. For background music in my office the EL84 is good enough.
Back to subject: what are the builder's experiences with hum - which transformer would be best? DO I need to go to Sowther or VVT?
Thanks