I’m going to say the obvious thing here: Surely it should show the volume as 
0-11?

> On May 3, 2019, at 8:13 AM, Justin Scott <[email protected]> wrote:
> 
> Thanks; good advice. I am an EE with 12 years of experience and have worked 
> with HV before. Built my own tube amp with 420 VDC inside. Would love to hear 
> your tips.
> 
> What I'm actually building is a volume display for a tube amp. When you turn 
> the volume pot, a couple of nixies will display 0-99. The amp in question 
> already has a transformer that delivers 220VAC, so I will be dropping and 
> rectifying that to get my 180V for the nixie anodes.
> 
>> On Thursday, May 2, 2019 at 5:01:27 PM UTC-4, gregebert wrote:
> 
>> I dont recommend line-operated designs unless you've done some previous 
>> design work at  high-ish voltages. There are a lot of not-obvious things 
>> that go wrong (line noise, transients, component failure, inadequate 
>> isolation) with very bad consequences.
>> 
>> If you have done a lot of past designs, I can share some tips on how to make 
>> a line-operated design safer and more reliable. The last thing we want is 
>> for someone's nixie clock to cause a fire, or worse.
>> 
>> I've had a few "learning experiences" with line-operated circuits that 
>> ended-up with sparks, smoke, and/or small explosions despite careful 
>> forethought. There's always something you overlook, and sooner or later it 
>> will get you.
> 
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