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SPEAKER HUM

I have been playing with a new system. I was driving my speakers with a MingDa MC 34 AB tube amp (75 wt/ch ultralinear 40wt/ch triode) which is powered with 8 EL 34 tubes. It can be used as an integrated amp, and when I used it as such, it was DEAD quiet. I decided to make a good thing better, and just got the matching MingDa MC 2A3X preamp to go with it. The speaker hum when both are powered up is awful...not that very low level stuff you sometimes get with an amp/preamp set up...but loud enough to hear during quiet passages of musical pieces. I have been tormented in the past with trying to eliminate speaker hum...any help out there for this system?? Thanks so much Rsasso  (Threads | Answers | This Thread) 07-12-09

Responses (1-20 of 20)

Click title to read one, or click date to read all below it. 07-12-09   I do not envy you, it is a pain. my last bout was resolved b ...   Richard_stacy 07-12-09   Have you ruled out bad tube on the preamp (or simply a defec ...   Millicurie999 07-12-09: Almarg Although it is a bit technical, the following paper provides some good background on system-level causes of hum (as opposed to hum that is introduced within a particular component, which is definitely also a possibility here, as Millicurie suggested): http://www.jensen-transformers.com/an/an004.pdf Regards, -- Al Almarg  (System | Threads | Answers | This Thread) 07-12-09   To millicurie amp and preamp are plugged into separate outl ...   Rsasso 07-12-09   To millicurie i substituted a small tono preamp for the big ...   Rsasso 07-12-09   Iirc, plugging the amp and pre to separate lines is a very g ...   Swampwalker 07-12-09   At the risk of being too obvious - have you tried a cheater ...   Newbee 07-12-09   To millicurie ok: i substituted the interconnects between a ...   Rsasso 07-12-09   To newbee someone stole my cheater plug. i will get one at ...   Rsasso 07-12-09   that's typical of a microphonic tube (or tubes). hum can al ...   Tvad 07-12-09   I would try another preamp, if you can get your hands on 1. ...   Fplanner2000 07-12-09   To fplanner2000 i have to share my ignorance. don't you ne ...   Rsasso 07-12-09   To tvad, i dont have any of these 6sn7's to rotate right no ...   Rsasso 07-12-09   that's a good question. many of the most sought after and e ...   Tvad 07-12-09   As swampwalker mentioned, amp and preamp in two different ou ...   Millicurie999 07-13-09   To tvad, thanks again for your very knowledgable input on m ...   Rsasso 07-13-09   To millicurie999 since the amp is about 10ft away from the ...   Rsasso 07-13-09   yes, it might. with components that are connected via sing ...   Almarg 07-13-09   One other potential cause of hum would be a cable tv that sh ...   Goose 07-14-09   Another thing to check is whether the tubes are propertly se ...   Cleaneduphippy

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