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Registered Member #4800
Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39
hello everyone
i got my gu81m tube today and decided to put my tesla coil together, i have checked everything and it all seemed too be wired up correctly but when i turned it on i got nothing, no tube reddening, no streamers, no humming (exept for my noisy fillament transformer), no nothing!!!! i tried changing the direction of both feedback and primary coil and that made no difference i tried two mots 1 mot, still nothing. yes the secondary is grounded and i also tried arcing the secondary to a grounded rod, still no arc!!! why.
here are the values being used: grid resistor 4k grid capacitor 1.5nf tank capacitor 1nf tube gu81m filament capacitor 4.7nf all grids are connected together
Registered Member #2018
Joined: Tue Mar 10 2009, 09:56AM
Location: Switzerland
Posts: 74
Are there earth grounds on the feedback resistor and the center tap of the filament transformer?
Maybe the coil is just out of tune. With a discharge lamp (neon lamp or similar) you could check if there is an rf field near the coil. The light bulb lights up long before there is a discharge from the top terminal.
Registered Member #4800
Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39
kilovolt wrote ...
Are there earth grounds on the feedback resistor and the center tap of the filament transformer?
Maybe the coil is just out of tune. With a discharge lamp (neon lamp or similar) you could check if there is an rf field near the coil. The light bulb lights up long before there is a discharge from the top terminal.
Best regards kilovolt
yes the earth is connected too the center tap of the filament but not the feedback resistor instead i have the grids going into the the resistor and cap and then into the feedback coil and then to ground does this make a difference ? ill try changing it and ill also make a schematic of my exact setup :)
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why wont my vttc work!!!
