All Working on an R4C for a friend BFO transistor is suspect - AM detector works, nil on SSB/CW. How critical is the direct replacement of the 2N3394 in the circuit? Will a substitute work satisfactorily? Does anyone have a 2N3394 in their inventory that they can spare? Mouser offers the 3393 as a replacement - its .08 per piece, so cost isn't a factor. Thanks Paul