Re: {Collins} 4cx1000/8168

Based on many years of experience with ceramic tubes, I recommend you burn that filament for 24 hours prior to applying B+.



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On Aug 29, 2013, at 5:25 PM, "Leigh" <bipi@xxxxxxxxxxx> wrote:

> Most will tell you it will make no difference at all but I have had NOS 4CX1500B's pop the high voltage if applied after just putting it in the amp (with 3 min warm up of coarse).  I'd run it with filaments on and high voltage off for 30 mins or more before applying high voltage.  Sure won't hurt to do that.
> 73 de Mike
> K7PI 
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