Toy12 Plasma tweeter Diy-6

Order 120W VR for step down high voltage.


Put resistors on wood rack and finish high voltage connection.


After long time debug a tiny flaming just pop out.
So far I could make sure my circuit of RF TUB amp. is workable.
But I still need to tuning work voltage and current of PL519 to improve flaming make it large.



Zoom in picture.


Re-modify working voltage and current 480V and 0.2A.
No sound modulation in and Just carry frequency radiation.



Modify flaming size.

Toy12 Plasma tweeter Diy-5

After  check high voltage generate have a problem cause by step-down resistor.
Because PL519 will take 580V/200mA so resistor of step-down is hot .
Step down voltage about 250V by 0.2A ...74W.  Estimate need cascade a 200W resistor for low temp. profile operation.



Finish IF circuit high pass filter and measure modulation out about 105V ...in spec.
But ECL82 and 6C45pi Plate-voltage need check again when replace high voltage resistors.



Because RFC inductor is hard to buy on internet So I  use a 20 ohm resistor hand make a RFC.



Top view.

Hand make Ring wire for PL519 feed back circuit.