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Title: grid and plate current reading with no meter... pilot lamp Post by: W4AMV on April 01, 2021, 03:06:51 PM Used this on a novice rig as a kid. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Forgot the details and cannot recall if it used link coupling to the oscillator driver tank and the plate tank. Or just in series as shown here with the grid leak return and HV to the plate. I recently found that arrangement in a 1950 handbook for a mobile rig. Schematic attached. Any folks on the forum use this for peaking the grid drive and dip and loading plate current? As I recall, it worked great. I believe it used a #47 dial lamp. Same lamp used to peak oscillator drive. I am short on meters, so looking at giving this a try in a transmitter under construction. Any issues with HV flash over. The unit documented in the handbook is at 300V. How high a V before an incandescent lamp like a #47 flashes over? I think my 6DQ5 was on 500V. Thanks, Alan |