Does anyone care to ask an amplifier designer a technical question? My door is open.
@tomic601 Not sure what you mean by thermal tracs? ON semi is making the Motorola parts. I dont know if there is anything new. Do you have a part #. |
@atmasphere - this is the power cord he was referring to that does make a difference under certain circumstances: http://tubeaudiostore.com/pocoyoucanac.html Otherwise as Roger noted in his last post just get a cord with good connectors. |
@analogluvr Over voltage can cause mechanical hum in a transformer Thanks for pointing that out. The flux (and thus mechanical buzz) of a transformer rises sharply at some voltage. That point is up to the designer. I try to get mine still quiet at 130 Volts but we are getting up to 125 now in our houses so might have to go higher and wind for 125 rather than 120. Small amounts of DC on the line make things worse expecially with torroids as they have no gap. 0,5 volts of DC is enough. We make a power cord with a device to block the DC. Ask Clio, or you can make your own. Im not trying to sell anything here or be accused by one who does. Power transformers are a pain in the ass. If you make them bigger to reduce the flux they make more noise due to larger size. Ive been around the block several times on this. All our tranformers are silent at 2 feet in a very quiet room. My thought is if you cant hear it at the listening position whats the problem? Who sits next to their power amp? If you want someting lower noise I can make it for you. Power transformers can become noisy with age. Spongy feet or a bed of sand helps a lot to decouple from the rack or floor. |
@iamisaf When units are powered on I hear a very mild hum noise from the amplifier unit, if connect amplifier directly to the wall outlet I don't hear any hum noise. If I do the similar setup other side in the basement I don't hear any hum when connected to wall outlet or thru panamax power conditioner.What might be the issue? The two sides of the basement may be on opposite phases of your 120/240 line. Houses are wired to try to balance the load on each phase. One phase may have DC or slightly higher voltage. Why are you using a power conditioner anyway. I dont. Sorry to say this is a horrible product. Anytime they bring all you phone, cable, power, God whatever into one box its a horrible idea. If you can send it back please do. Modern devices generally do not need surge protectors and they tend to catch on fire!! https://www.crutchfield.com/p_299M5300PM/Panamax-M5300-PM.html?awkw=75647650225&awat=pla&awn... |
