I just had a look at the datasheet for the tube and it is shown as all 
voltage regulators are encased in one envelope, not four separate.

http://www.radiomuseum.org/tubes/tube_zz1030.html 
& http://frank.pocnet.net/sheets/128/z/ZZ1030.pdf

/Martin



On Wednesday, 16 March 2016 13:09:37 UTC+1, Dekatron42 wrote:
>
> As you say it looks like the tips are open, they certainly aren't melted 
> at the tip like the four separate ones.
>
> It would be interesting to see the result if the ZZ1030 was checked with a 
> plasma lamp, that would show if there is neon gas in the envelope or just 
> in each voltage regulator tube.
>
> /Martin
>
> On Wednesday, 16 March 2016 12:49:26 UTC+1, jrehwin wrote:
>>
>>
>> OK... so why a getter in this one?  All the little NEON tubes are each 
>> already sealed.
>>
>>
>> I don't think they're sealed.  I think their tips are open to the main 
>> enclosing envelope.
>>
>> - John
>>
>>
>>

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