[wesman11483]

I was getting very low output/crackling/generally shitty tone from my RM4. I changed out all cables, eliminated entire signal chain, and replaced the three tubes on the unit. Am i missing something?
Could my "new" tubes be bad? Something else?
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Randall RM22: Jaded Faith Voxless, Salvation Dreadplate
Deals with Firebird V, blacksun, Ty, and others...

[trimix]

There are a bunch of unused loops on the back of an RM4, try inserting jumper cables in them an see if it eliminates the crackles. The normalled connections will oxidize over time from not being used and creat all kinds of flaky intermittent issues.
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Randall- RM4, Clean, 1086, Mr Scary, Grail
Egnater- SL2X D/S
Salvation- TwinFace, MarkUs
Jaded Faith- Twox, XTC, Custom RVerb
Sacred Groove- Custom SL+
Mesa/Boogie- Stereo Simul-Class 395
(2) Randall 4x12- X-pattern Vintage 30/G12T-75

[joey_truelove]

Sometimes the modules aren't properly seated. I'd recommend electronics cleaning solution.

Sometimes the pots can become scratchy and go in and out, which can be worth looking into.