Around 165, can’t remember exactly, but enough so as not to sacrifice tube 
brightness and yes you could have a bad cap. 
 

On Saturday, March 28, 2015 at 10:49:05 AM UTC-7, Kiran Otter wrote:
>
> MichaelB, what did you lower the voltage to?  And I did replace C6.  Could 
> I have a bad cap?  I had a hell of a time finding just one; got it shipped 
> free from RS for for like a dollar.
>
> On Saturday, March 28, 2015 at 12:46:24 PM UTC-4, MichaelB wrote:
>>
>> I have had this same issue with 3 of Jonas' clocks and each time the fix 
>> has been a combination of replacing C6 and a dropping the voltage a bit to 
>> keep the temperature down on that VREG. I also ended up changing the design 
>> of my enclosed cases to allow better cooling internally and this seemed to 
>> fix the issue. These clocks all seem to do this when there is inadequate 
>> cooling in an enclosed case. 
>>
>>

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