Labels:text | font | black and white | document OCR: THE RED BOX wala Lae CONSTRUCTION The largest units in the red box are the telephone earpiece and battery. Since the unit works on 9V and has no coils, 10V parts can be used. The push buttons are high quality units that won't bounce on you and fire the box twice. Grayhill makes some good ones. Snap action are the best, but they make noise when you hold the box up to the phone. -BB MISSISSIPPI- Different earpieces or speakers will produce different volumes. If a low im- pedance (8-32ohms) speaker is used, less volume and more battery drain will result. Increase the value of the 10 mid. output capacitor with low impedance speakers, and increase 22K gain resistor if necessary. -JK ARIZONE- Remember, with a red box you are going to play it for an operator who will easily recognise a faulty ton ...
