From: nojunk@knology.net   
      
   On 7/6/2018 6:17 PM, jurb6006@gmail.com wrote:   
   >> "** For that to be the case, YOU have to know in ADVANCE what the   
   acceptable ESR readings are for each electro you need to test."   
   >   
   > Not so much. The ones that are bad were stressed more, the others in the   
   unit of the same make and age may not have been and not as much of the   
   electrolyte has been boiled out. In circuits of the latter type, ESR is not   
   that critical. Nut with the high    
   pass filter it makes the value less important.   
   >   
   > So acceptable ESR readings are not going to be found on a chart. What's   
   more. my device does not actually read ESR in a lab type fashion, it is meant   
   more as a go/nogo tool to speed up troubleshooting, even for those who can't   
   really troubleshoot.   
   >   
   > Even in the user manual for this thing I would include to look at the   
   positive (or whatever) lead and look to see if it is green and to look for any   
   of them bulging. My goal is to keep as much of this stuff out of the dumpster   
   (skip) as possible.   
   >   
   >> "I regularly work on valve / tube amplifiers and am therefore familiar with   
   ESR readings for high voltage electros in the range of 22 to 220 uF. No need   
   to look up any lists and my spares stock is available to compare readings with   
   new parts."   
   >   
   > With your experience you don't have to look up shit. you can say right away,   
   "This is good", "This is marginal" and "This is bad". But I do realize that   
   many, especially novices have not had that inculcated into them.   
   >   
   > For them all I can say is change the worst first.   
   >   
   >> "For example, the 5 or 6 HV filter electros in most Fender tube amps can be   
   checked and evaluated with a Bob Parker meter in under 1 minute. The small   
   cathode bypass ones take about another minute and you are done."   
   >   
   > Yeah, double or even triple the secondary voltage and the condition of the   
   caps becomes quite important.   
   >   
   >> "Of course, extremely old caps and any that show signs of having oozed   
   electrolyte get replaced -  no questions."   
   >   
   > Have you noticed that most of them took a hell of alot longer to go bad ?   
   >   
   > Anyway, I think my doodad can be useful to novices as well as masters. Very   
   fast. In a power supply, clip one lead to ground and check all of them, a   
   minute ? That's like an 8086 compared to today's processors. A minute to chack   
   a cap ? That is an    
   eternity.   
   >   
   > There is the Dick Smith, fine and good. But for servicing you don't need to   
   know between 1.7 and 1.8. Why ?   
   >   
      
      Here's a video, most of it uses a scope to see the results of the   
   test, but at the end of the video he does show test with results on an   
   analog meter.   
   > https://www.youtube.com/watch?v=115erzCCxgE   
      
                       Mikek   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)