Rick,
I have a Kees kit and the symptoms are almost exactly as you describe. I don't know that I've heard squeals but otherwise muffled RFI is how I would describe it. Unless Don weighs in with a better variant of this mod I'll probably try Mark's version this morning as that's very simple for others to effect and easier to modify Kees's kit to reflect that change relative to bridging the base/emitter on Q1 with a capacitor. Thanks for the good troubleshooting and persistence- this was a tough bug to swat.
John
KC9OJV
