Looking for a book on the Morrow LDA 1000-SA scope. Appears to maybe be a modulation monitor but I am not sure. Need to know what type the 4 nixies are and connections to the 4 pin jones plug. Thanks Don Brooks Rt 12 Box 2924 Palestine, Tx, 75801 Radio W5ORW since June '48 Milliwatts to Megawatts