Thanks for the possible explanation Dieter. Does this fit with the fact
that the same tube shows the same defect on just one digit in multiple
different IN-18 clocks?
First: Note that it is NOT a defect. It is a wrong driver circuit. The
mistake is made by the circuit designer, not by the tube.
Now the answer:
Yes and no.
If you try the same tube in a correct designed clock (nixiechron, or
nocrotec IN-18 clocks for example) 100% no IN-18 will show a blue spot.
But, another mistake always is made with the IN-18 tubes.
This is the rated current.
To get a real high definition readout and the magic purple haze the
tubes MUST be driven with 6mA, what is the REAL rated current of IN-18
tubes. And of course they should not be multiplexed.
The only clocks I know ad hoc wich drive them without multiplex, without
Ucc and with 6mA are the Chronotronix IN-18-V2, the Nocrotec IN-18-V3
and the soon coming clock kits: IN-18-V4 and V5. But I'm sure there are
some other clocks out there.
So be careful: a blue spot means that the driver circuit IS WRONG!
Dieter
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