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Title: Screen Modulated 4-1000A Post by: Chris P. on April 21, 2015, 09:47:25 PM It looks like I have the right junk laying around here to build a screen modulated 4X1 rig similar to the method KB3AHE used. Right now its looking like a pair of 6BG6's into a small multi tap mod transformer, but that may change as I dig through the junk and see what I have. Looking at pictures of his rig here: http://amfone.net/Amforum/index.php?topic=16319.0 Can anyone tell me what the control marked drive did? It looks like a wire wound pot. Maybe screen voltage control on the 6146?
Title: Re: Screen Modulated 4-1000A Post by: W9ZSL on April 21, 2015, 10:22:40 PM I have a merit A-3008 10 watt modulation transformer 10K CT primary with 4, 5, 7.5 10 and 12K secondary NOS iron if you could use it. I bought it to build a P/P 6V6 12 watt plate modulator for a QRP project.
Title: Re: Screen Modulated 4-1000A Post by: WD8BIL on April 22, 2015, 09:36:07 AM Yes Chris, Frank was controlling drive by adjusting the screen on the 6146 driver.
Title: Re: Screen Modulated 4-1000A Post by: Chris P. on April 22, 2015, 11:54:39 AM Thanks guys. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I think I have all the right iron here to do this, but thanks for the offer! Hopefully this thing will start coming together soon, and be on the air sometime this year. |