On Dec 19, 3:57 am, Lucky <[email protected]> wrote: > I would be interested to follow what you do Grahame as I too would > like to convert one to 230v. (Is this not the one?http://threeneurons.wordpress.com/dekatron- stuff/) > > On 19 Dec, 09:38, Grahame Marsh <[email protected]> wrote: > > BTW, Mike, could you post a link to your all valve/tube relaxtion driven > > dekatron - I had wished to modify it to 230V 50Hz but now I've lost your > > design. Ta.
Here's the direct link of the one above: http://threeneurons.files.wordpress.com/2011/08/vr_tube_spinner.gif 230V might be tough. You can cheat, and tap midway between the capacitor divider in the filament leg. Two 3.9uf caps in series will do. Then pretend its just 120V source. Max possible 1/2cycle surge is 3.5A. Actual current pulse should be ~500uS. Tube filaments should handle it. Another method is to use a dual 115V primary 12V transformer. Hook the primaries in series. Tap the midpoint for 120VAC, and use the 12V secondary to power the filaments. This second one might be a better option in 230V-land. The heater-cathode specs are pretty tight. The 6AL5/12AL5 have greater range than the 12BF6. Of course, in my un-modified circuit, the filament and cathode of the 12BF6 is tied together, so its heater-cathode spec is a non-issue. BTW: I use the term heater and filament interchangeably here. That is NOT the convention. One is used for directly heated cathodes, and the other for indirectly heated cathodes, and my memory is too crappy, to remember which is which. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
