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Title: Testing a grid input circuit Post by: KC9LKE on January 10, 2012, 01:48:38 PM All
I would like to start winding input coils and testing them for a grid driven 2 x 813 class C amplifier. I plan to have the bias supply connected, the beam plates connected to ground, and the screen bypass caps in. Can I properly test the input circuit with my exciter without having the screen and plate supply’s built yet? Leave the plate swinging in the wind? TIA Ted / KC9LKE Title: Re: Testing a grid input circuit Post by: KC2ZFA on January 10, 2012, 01:53:20 PM The answer is yes. However, you do have to run the filaments.
Peter Title: Re: Testing a grid input circuit Post by: KC9LKE on January 10, 2012, 03:24:16 PM Yes and properly bypassed.
Title: Re: Testing a grid input circuit Post by: KM1H on January 10, 2012, 04:42:55 PM You can also neutralize them at the same time.
Carl Title: Re: Testing a grid input circuit Post by: KC9LKE on January 10, 2012, 07:40:16 PM OK thanks !!
I want to really understand and be able to design tuned grid input circuits. The rest of the amplifier seems easy compared to the different topologies of input circuits. Tradeoffs etc. I have a million questions but will do some “due diligence” and scourer the board before posting questions about the obvious at this time. Many thanks and Best regards Ted / KC9LKE. Title: Re: Testing a grid input circuit Post by: Opcom on January 12, 2012, 10:41:10 PM Please update us on this testing. I was given the same advice to test the RF deck alone, filament only, and it was very useful to fix what ailed it.
Title: Re: Testing a grid input circuit Post by: KC9LKE on January 13, 2012, 07:34:28 AM Pat: AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Sure thing but it may be awhile. I would like to make one more post about the type of circuits that I have found, before I start. On a positive note… last night I mounted the sockets, wired up the filament circuit and fired them up. I was very late so I turned off the shop lights, opened an 807 and observed the gettering process. After casually collecting parts for three decades it was a thing of beauty! I’ll keep ya posted. Best regards Ted / KC9LKE |