![]() The louder the pop, the better the compression. You can test this by pulling out the 1st or 3rd valve slide (not all the way), then depressing the valve. Sometimes you're better off just buying new pistons and having them aligned properly. ![]() Low compression = a looser fitting valve, which needs more viscous valve oil like Hetman Classic #3 (that's what I use, personally), or in extreme cases the valves themselves will need to be lapped and re-plated. ![]() High compression = a tighter fitting valve, which can use almost any valve oil. If you're using oil that's too thin for your valves, you could be forced to re-oil more often ("this horn eats valve oil" is another way to say "I'm using the wrong oil") or in extreme cases, it will seem like the oil isn't doing anything at all - because it isn't it's too thin to actually provide a lubricating cushion between the piston and casing wall. Older trumpets or ones that are not well built or taken care of have a larger gap between the piston and casing, which requires more viscous oil to fill. I think you underestimate high school kids' abilities to lose things, haha!Ībout the compression, yes that is talking about the microscopic gap between the valve piston and the casing.
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