Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Stereomour => Topic started by: Thoburn on October 12, 2010, 03:08:43 PM
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I received my Mullard tubes today and carefully installed them. When I turned on the amp I practically had a heart attack! The tube flashed bright white, and I mean BRIGHT white, before settling into a normal looking orange glow. It only lasted for a fraction of a second. I hope that flash does not damage it. It sounds fine so far (I'm only listening to FM).
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As I've mentioned before, this is not uncommon for certain vintages of European small tubes. It had something to do with the formulation they used for "controlled heater warm-up".
It should behave the same way every time it is turned on from a cold start.
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Thanks and yes, I have read that before, but I was shocked by the 'flash bulb' intensity of it.
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It is shocking the first few times you see it! Imagine firing up a vintage Marshall guitar amp with 3 or 4 of those little flash-bulbs in it---that was how I first was introduced to this! I was dead-certain that a fire was about to erupt!