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Title: BC-474 / SCR-288 Post by: KA3EKH on July 07, 2025, 12:53:47 PM been working on a BC-474 transmitter receiver that makes about 4 watts of plate modulated AM on eighty meters.
Its a early WW2 design by RCA that uses one volt tubes in the receiver and three 6V6 tubes in the transmitter. One for the VFO, one for the PA and the last for the modulator. Fun project so far, did not expect much from this set being so simple but have to say after getting it going am impressed by its performance. If there is any interest can post more details. Title: Re: BC-474 / SCR-288 Post by: KD4APP on July 08, 2025, 05:55:40 AM Looks nice! Title: Re: BC-474 / SCR-288 Post by: KA3EKH on August 06, 2025, 04:26:34 PM After a couple delays the BC-474 project is now finished. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
You can see this old WW2 portable radio on the Tube at : https://youtu.be/A_cdnkqMCwc Produces about four watts AM or CW with three 6V6 tubes, one as a oscillator, one for the PA and one for modulator with real plate modulated AM |