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MV rectifier cloud flicker


I recently installed MV rectifiers (DCG4/1000 RTC) on my SET monblocks. I'm very happy from their performance, although there is something that makes me wonder...

The ionized mercury (blue cloud) sometimes starts to flicker at low random frequencies, ranging from 1 to 10Hz, non-periodically, slightly. This happens from tube to tube. Sometimes one rectifiers stops flickering, but another begins.
A problem is, it is invisible to the camera, but visible to the human eye.

Can anyone tell me, any mechanism of the reason it happens and should I be worrying about it?
The current draw should be constant (100mA), because it's a SET amplifier. The flickering is independent of any music.

Best regards,

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  Michael Percy Audio  

Topic - MV rectifier cloud flicker - aknaydenov 14:05:25 02/07/17 (8)


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