Toy12 Plasma tweeter Diy-4

This week finish audio amp. (6C45pi) and IF modulation (ECL82) circuit.


For good shielding reason I design to build a small space for IF module.
But this cause it's hard to hand make and modify circuit.


Finish IF high-voltage and prepare for 6C5pi,ECL82,PL519 heater test.
Meanwhile I measure PL519 (insert already) heater voltage only 36.4V.
I got check spec. of  PL519.  So far the transformer of heater  is one way ticket.



The PL519 heater light is turn on.

Toy12 Plasma tweeter Diy-3

Fix shielding net on front side and assemble power bottom panel.
Mid panel for fix volume knob.


Fix shielding net on rear side and assemble AC connector.
Mid panel for fix Audio in RCA jack.


High voltage Design in a delay on relay (about 10 sec.) for heater turn on first.
High voltage I usage 2 times frequency boost to 1000V then step down to about 600V.
Finish L channel C-R-L-C filter.


Finish R channel high voltage connection.
IF frequency high voltage about 500v than step down to 350V for ECL82 plate and setp down to 190V for 6C45pi plate-voltage.



Two times frequency boost to 1000V Rectifier tub is 5U4G.

Toy12 Plasma tweeter Diy-2

Fix front plate and rear late.


Placement IF components.


Placement high voltage components.


Prepare net of copper.


For radial issue to prepare shielding nets.



Extend shielding nets for each block of plasma tweeter.