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Preamp valves can just be changed, no adjustment necessary
Don't talk politics and don't throw stones. Your royal highnesses.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I agree about using Mesa branded valves - a tech put JJs in my Nomad and it changed the character completely (and not in a good way).
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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Valves don't hold charge, but they do get hot, so leave them to cool down before swapping them (unless you enjoy the smell of your own skin burning)
Not really. It's one of many factors that might make it a little more fiddly on some amps than others, but like @strtdv says, you can always flip the amp upside down, or on its side if it helps you to get at the valves.
I find that the amount of room around the valve you're working on is the thing that makes most difference- if it's sandwiched between two other valves and there's only an inch or two of clearance between the top of the valve and the cabinet to get your hand in to (which is more likely in a head than a combo) you'll have a harder time unseating the valve. I find that a gentle side-to-side or circular motion is good- don't just grab hold and pull directly away from the base.
As far as I'm aware it's only capacitors that can hold charge when the amp is off, and then only the big ones that will give you a jolt. Either way, you won't come anywhere near one if you leave the amp in one piece. Valves only hold heat, so let them cool or wrap a cloth around them before you handle them.
Don't talk politics and don't throw stones. Your royal highnesses.
Don't talk politics and don't throw stones. Your royal highnesses.
1. Ouch.
2. True.
Don't talk politics and don't throw stones. Your royal highnesses.