I just received a note and this is an excerpt. Does anyone know and more ? "It would be interesting to see how others made out. There is a HBR in the Hammond Museum in Guelph Ontario. Would you believe that I only recognized it from the rear, because of the coil/ capacitor layout. I'm told by hams who have built them when properly tuned up will give a 75A4 a run for the money. 73 Kees K5BCQ