Hum SOLVED!!!!

[bullpeters]

i have posted here a bit about the hum in my system. its all home made, except the Turntable but i have fooled with that enough not be sure of its intentions. So i really could never figure out where the problem came from.
I have had a periodic "hum" and it has been a major source of frustration. I thought ground loop. So i spend many many hours changing stuff to no avail.
I figured that given it was a MC phono stage and it was all valves then it would just hum a bit, But sometimes it would get REALLY loud in one channel and not the other. Weird stuff i couldn't explain
Well today i installed a new cart. Same as before, Denon 103.
Perfect quiet. I mean black inky nothing. It wasn't the wiring, i changed that many times. It must have been the Cart. WTF? I guess there was something amiss with insides of the old 103? I cannot believe the difference. Its quiet. Its nice. At peace with myself

 

[HollowState]

Glad you got it. I still use a Denon DL-103D. Nice old gal. Your tail reminds me of an old experience I had as a teenager working part time for a local TV & radio repair shop. I had a small kids record player that hummed. It wasn't the filter cap or a bad ground or open wire of any kind. I spent a couple of hours on it and was about to give up when just for drill I tried a new crystal cartridge. Well, that was it and a lesson I've never forgotten. Another hard lesson was a portable transistor radio that worked but motor boated. Tried everything to no avail. Turned out to be a weak battery in a series of several D cells that powered it. Arrgh!

 

[bullpeters]

its not always apparent were the problem lies. in anything
i gotta wonder what was going on in the cart tho.....
i cant see a scenario that would explain it.
But i now have an extremely quiet, detailed and just outstanding system (well i am starting to see some other stuff i could "improve "