FF PNP All American Transistor Pair
Just finished the build and my FF sounds great. Very interesting that the R4 proper value for my transistor pair is 330 ohm and not the 470 ohm shown on most schematics. If R4 is not the proper value for a specific transistor pair, the FF will probably not be what you are hoping for. Much easier to purchase a transistor pair with the proper resistors than just putting in what the internet schematics show.