9a39ba92   
   From: none@ntlworld.com   
      
   On 05/09/2010 12:33, Patrick Turner wrote:   
      
   >   
      
   >   
   > Most people have utterly no clue about what the tube tester tests   
   > mean.   
    >   
   > Patrick Turner.   
      
   Let's just say that I wanted to make a dedicated tube tester for my   
   KT88's. Not just test the tubes, but to enjoy the experience.   
      
   Okay, let's take this step by step and let's just concentrate on each   
   step. Let's just deal with steps 1 and 2 for now.   
      
   Of course, if the tube is faulty it may turn up in the early stages of   
   testing and testing would stop early on.   
      
   STEP 1: Measure heater continuity.   
      
   If an open condition - stop testing.   
      
      
   STEP 2: Electrode leakage (Cold). If failure stop test.   
      
   What electrodes are tested? And what voltages? AC or DC?   
      
   a) Heater to Cathode (What Voltage?)   
      
   b) Cathode to G1 (What voltage?)   
      
   c) Cathode to G2 (What voltage?)   
      
   d) Cathode to G3 (What voltage?)   
      
   e) Cathode to Anode (What voltage?)   
      
   etc.   
      
   I'm not actually sure which electrodes should be tested in relation to   
   other electrodes. I believe some electrodes would be connected together   
   in the leakage tests. Anyone know all about the leakage part of testing?   
      
   Can anyone give me an idea of a suitable circuit (components) just to   
   test KT88's for leakage? A circuit that protects a meter.   
      
   After leakage is sorted, then I can go to another specific step in testing.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)