We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
MANAGERS AND PROJECTIONISTS 1373
once one is familiar with it, cannot be mistaken. Bj removing the amplifier cover and blocking the cover switch in closed position, one may sometimes sec smoke coming from the defective condenser. In case no smoke or spark can be seen, cut out one bank of condensers and try the amplifier to see if it now is all right. Then try it with the other bank cut out.
Once you have determined which bank the trouble is in, you can then cut out each individual condenser until the faulty one is found. To get the show going again as soon as possible, after ascertaining which bank the faulty condenser is in, leave the entire bank of condensers out of circuit and continue with the show, making the repair after the performance has ended. You then may test the condensers with battery and phones, or in some other manner if you desire.
Any tube the plate of which is decidedly red or yellow has abnormal current flowing through it. Normally the plates of the rectifier tubes will be dark, the plates of the amplifier tubes will be cherry red. They may only be seen when the tube is shaded from all outside light. Should any tube get much hotter than this, there is trouble which must be found and rectified.
If the grid and plate of one of the amplifier tubes should touch each other, it will cause the plates of both the tubes to overheat and the meter to go off the scale. This is because of the heavy current flow due to the fact that the grids have gone positive. Of course under this condition no sound will come through ; also the plates of the rectifier tubes will be overheated. Removing the shorted tube from its socket removes the fault. The meter will then read between 35 and 46, which is about right with one of the tubes out.