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Hi all
I was just wondering how long is a normal warming up time for valve mics. I know a lot of people like to leave them for 45 minutes, but I have noticed that my AT4060 sounds best after about three hours. I now leave it turned on for as long as possible before using it on anything serious. I think it sounds nicer when the body warms up. It's being fixed by AT at the moment, who reckon the power supply is faulty.

I have an Oktava MKL 5000, but warm up time for that is about five minutes and it doesn't sound any different after that amount of time, but I have noticed that it starts to crackle after about five hours. I'm assuming that this has something to do with the other components warming up. I'm going to re-build it anyway, as the internal build quality is appalling; I've opened it up a few times to change the valve and now it's falling apart! I'm hoping that this will get rid of the crackles.

Thanks
John Stafford

Comments

AudioGaff Sun, 05/08/2005 - 14:03

45-min is the least amount of time, a good hour to hour and a half is what I do with any tube gear. It is not just the warm up time as it is warm and stabilize time. Depending on the tubes, their age, circuit and the temp/humity of the room, the stabalize time could be 2+ hours. If your finding it takes 3-hours for best results, then it takes 3 hours.