Good day everyone. As the title indicates, my ‘79 DR is crackling very loudly but only every once in a while and only on the vibrato channel. This is the model with the pull boost volume control. I’m thinking that it might actually be the actual volume control as it feels a bit “flakey”. However, the amp only seems to start crackling after being on for 10-20 minutes. I don’t think it’s power amp related as it doesn’t make any noise on the normal channel. I’ve left it on with nothing plugged into it and sure enough, it started crackling. I turned down the vibrato channel and turned up the normal...it was dead quiet. Turned up the vibrato and turned down the normal, it started crackling again. I’ve swapped the pre-amp tubes between the normal and vibrato channels and the problem remained on the vibrato channel. Today I took the chassis out and sprayed cleaner in all the pots. I then sprayed Deoxit in the preamp sockets and inserted and removed the tubes a few times. After reassembling it I turned it on and started playing some guitar thru it and sure enough, 15 minutes later, it started crackling again. I had all the electrolytics and filter caps changed 2 years ago and my tech went over it with a fine tooth comb and it’s been great ever since. Then a couple of months ago, it started doing this every once in a while. Like I said, I feel that the push/pull volume pot seems flakey and if I wiggle it, there is a bit of movement and it crackles and cuts out a bit. Therefore, I’m thinking that I may change this next. However, I’m thinking of just putting a regular 1M ohm-A rather than another push/pull pot since I find the boost to be useless. My question is what do I do with the 2 wires that attach the the piggyback portion of the original pot? Can I just add some heat shrink on them and leave them be? Or should I be following these wires all the way back and desoldering at the source? Thanks in advance for any responses and help.