2. amps-preamps
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One of the tube on my preamp flashes on turn on.

I am new in the tube world. I recently bought a tube preamp along with two Mullard 12AT7 and everything was fine until today when one tube flashes for a second on turn on and after that it is ok. Is it anything wrong with the tube?
olimpico

Showing 1 response by upscaleaudio

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upscaleaudio
259 posts
 
100% normal for most any tubes from the Philips Europe factories. It is just momentary resistance in the heater.

So it will happen on Philips Miniwatt, Mullard, Amperex, Radiotechnique, Valvo, and Adzam 12AT7 12AU7 12AX7 and others.

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