Well, … I knew it.
He HAD to learn the HARD way.
Tubes have this tendency of humming and brumming, hum hum hum, brum brum brum, … if you only let them.
Well, after the initial shock of the sheer volume of the hum – an ear breaking and quite deathening level, actually, my friend came back with the “issue” of … HUM.
That’s when I came with that infamous saying: ” I told you so !”.
Get rid of that crazy yellow-black twisted pair, unshielded cable length that is happily running around over through half of the chassis, with no screen whatsoever, from the very input tube grid circuit to the unshielded RCA plug.
DO Something about it, because it is collecting all the rubbish from the air that you would not even imagine !
So he did.
Now it looks like this ….