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For a long while i was completely immersed in the world of tube microphones.... I know studio guys that actually leave their tube mics on ALL YEAR LONG....
strange.... but MANY of the studio guys I've talked to subscribe to this type of theory....
I use a CAD VSM at home (never understood the Neumann price vs. sound comparison).... it's a semi cheap tube microphone.... and yes... it does respond and sound better after it's been on for a couple of hours...
Bear in mind that common practice is to hang tube mics upside down to allow the heat to escape upwards....
just food for thought...
oh yeah... I've got an amp with the powertube section in the bottom of the amp to eliminate the hum of that the power transformer creates when cranked AND to allow the heat off the powertubes to escape.. without putting wear and tear on the preamp components....... and on a 3 hour gig.... NO fluctuation in the sound.... but it's got a TON of mojo.... consistent mojo..
so the heat theory sounds VERY reasonable as to fluctuation in response of the amp... but not so reasonable when talking about amp mojo.....
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