From: nojunk@knology.net   
      
   On 7/6/2018 7:55 PM, amdx wrote:   
   > On 7/6/2018 7:31 PM, amdx wrote:   
   >> 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   
   >   
   > Found his analog design here. > https://www.youtube.com/watch?v=bmYAgat-sOQ   
   >   
   >                       Mikek   
   And another one, > https://www.youtube.com/watch?v=3fiUZZlveS0   
      
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