07-21-2022, 11:05 PM
boy, am i missing something. i don't even see an IF grid resistor [which grid, by the way??]. except the one on grid 2 which is labeled on the schematic as 51K ohms to ground. i do see that "the that the RF amp has grid bias and the IF amp has cathode bias developed by the 400 ohm resistor in the cathode circuit." but i read 700 ohms on the IF cathode resistor, not 400 [just a typo?]. and the schematic says 15 ohms from the grid cap to ground, not 51K. but regardless, i'd like to know why the IF grid 3 is coupled to the IF transformer, which isn't common at all on the relatively few radios i've looked at.