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Registered Member #3974
Joined: Mon Jun 27 2011, 06:50PM
Location: Germany
Posts: 23
yes i know that, the vttc will have a built in variac to vary the voltage from 0 to 3000 VDC, or is the voltage coming out of the fullwave rectifigher 3KV or close? BTW the vttc has meturing equitment to messur the anode voltage an current. the maximum voltag of the meter is 3KV and im using a variac to regulat the voltage. but if the output voltage of a fullwvave rectifigher is greater than 2 KV i will use that.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The output of a MOT is ca. 2100 VAC, after rectification this turns out to 2960 volts with no load. Of couse the voltage will drop under load and because MOTs are shunted, it will drop a lot...
Registered Member #3974
Joined: Mon Jun 27 2011, 06:50PM
Location: Germany
Posts: 23
so using a full wave dubler would work? an shood i use a audio output transformer in the amp cercuit? btw the amp im using is this one, well sort of:
im going to use a 1 nF 6KV cap as a cupling between the anode of the pentode part of the pcl86 and grid2 on the qb3/300 and im using a 8K resistor infront of the anode of the pentode part of the pcl86.
dose the pcl86 amp have enough power to modulate the qb3/300?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Prof. TeraVolt I have looked for screen grid drive circuits to and i found this one in a 1956 arrl radio handbook. I have a gu-39b as you can see in my avatar.hope it helps ]kmbt22220110628070612.pdf[/file]
Registered Member #3974
Joined: Mon Jun 27 2011, 06:50PM
Location: Germany
Posts: 23
yes thanks a lot. this is prittymuch just what i was looking for. :) What was the title of the handbook, i might get a copy of it or look it up on the internet.
Registered Member #1642
Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96
Thanks for the mention, Dr. Spark! If I had more time (or time to do it over) I would use that 4CX1000 instead. Probably would require about 30 to 50 watts of audio drive to the screen. Very simple design. Makes a good flame thrower!
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Audio Modulated Tetrode VTTC
