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4-400 screen volt circuit

4-400 screen volt circuit

Postby zs2cx » Mon May 02, 2011 7:56 pm

No tubes just solid state :lol:

Image

it so small it fits on a 4cm x4cm bord
will post a pic here later
what the heck ,might as well do it now... ;)


Image

The red Toroid have 34 turns centre tapped on it .9mm wire

here's the underside.
Image
soon soon.... :twisted:
CROC
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zs2cx
 
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Re: 4-400 screen volt circuit

Postby zs2cx » Sat May 07, 2011 3:08 pm

UPDATE


Ok so i tried this circuit now for a few days with some mods deluxe...no success really,
my HT voltage is too high requiring higher screen voltages and no matter what i did corrected the grid amps on the tube from creaping upwards in a minute or so.
this circuit work on 2600v ht :oops: but not 3500v, so hope u diy chaps read this, or even give us a tip i might be missing something.

200mw gave 150 watts out
1watt flat out :mrgreen: with gifox allaround :oops:

I am going to increase my screen to 650 volt and the bias voltage to -127 volt +_
and play around a bit driving the grid.
i do suspect my tank circuit is too close to the valve so will be using a neatralising aluminium plate at 180deg side of the tube mounted on a ceramic studd , adjustable, connected to grid and see what happens...
Eish...
CROC
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zs2cx
 
Posts: 74
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Gender: Male


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