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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I don't like that schematic, specifically the fact that the secondary is 'grounded' to B+. Just use the same schematic Steve Ward used, except use a resistor for screen supply and use a lower plate voltage... Its all the same thing. Use mains ground for the secondary.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I used this schematic for a PL 509 VTTC I built for a friend. It makes 10cm sparks and will run continuously without the plate changing color, it was possible to tune it for 15cm sparks but I didn't check plate heating at this power.
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Well, here is what I plan to do:
Arcstarter, let me know if you like it better this way...
I'll use the BV131 Power Supply, as it is
And for the VTTC part, I used a schematic found here and on many other .pl or .cz sites like (I had more luck with 6P45S than with EL509 )
I just made a few changes, like connecting secondary bottom to ground instead of +HV
The circuit is very close to Steve's one, differences are:
- grid leak cap and res are connected between g1 and feedback coil - grid leak resistor has a high value of 1OOk-2W instead of 5k-50W in Steve's design - we dont have a plate choke, maybe its not needed with this tube (I'm not sure bout that)
Dr. Kilovolt wrote ...
I used this schematic for a PL 509 VTTC I built for a friend. It makes 10cm sparks and will run continuously without the plate changing color, it was possible to tune it for 15cm sparks but I didn't check plate heating at this power.
Woaw , sounds impressive !
Many thanks for the schematic, I'll try that one too...
Is the purpose of the IRF740 driver to turn the tube on for a short time every cycle ?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
PhilGood: Yes it is. It's unwise to operate a VTTC on a filtered supply without an interrupter, this way the input power is very high and streamers are not very long. Ps. You can experiment with component values in the schematic, eg. the output voltage of the drive transformer as well as zener diode voltage affects on-time. Phasing of the drive transformer is important. The output of the voltage multiplier peaks at 1600 volts at deadly currents so be very careful.
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
thanks for the additional infos and nice sparks for such a small tube !
Well I will first start with my design which is very simple, as this will be my very first TC ! I should be safe with the low voltage and the transformer...
Then later I'll try your design, and I'll probly have more questions on how to tune it ... btw does it requires a scope ? cause I don't have one atm ...
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EL509 VTTC
