From: liz@poppyrecords.invalid.invalid   
      
   Cursitor Doom  wrote:   
      
   > On Sun, 30 Nov 2025 19:51:28 +0000, liz@poppyrecords.invalid.invalid   
   > (Liz Tuddenham) wrote:   
   >   
   > >Cursitor Doom  wrote:   
   > >   
   > >> I posted this for opinions on S.E.R so apologies to those like Jeff   
   > >> who frequent both groups. SED's got a wider readership, so I thought I   
   > >> might as well ask here as well.   
   > >> I'm just wondering if this damage was due to over-current or just a   
   > >> manufacturing defect. It still reads its advertised value of 1200   
   > >> ohms. What does the Panel think?   
   > >>   
   > >>   
   > >> https://disk.yandex.com/d/ommuYJD2ZKsW8A   
   > >   
   > >If we assume a relatively small overload of 10 W was sufficient to caue   
   > >the damage, that corresponds to over 100 v across the resistor.  Where   
   > >would a voltage like that come from in that machine?   
   > >   
   > >In practice I would expect is would take an even greater instantaneous   
   > >overload than 100v to instantly blow a hole, rather than a sustained   
   > >overload which would gradually cook the whole thing.   
   >   
   > The highest voltage in that thing is 90V p-p at 100kHz from the bias   
   > oscillator, but it's nowhere near the AGC.   
      
   ...and the oscillator would stop if it were loaded with 1200 ohms.   
   There just isn't that sort of instantaneous power avaialble in the   
   machine to blow a resistor like that, so you need to look for a   
   different type of fault altogether.   
      
      
   --   
   ~ Liz Tuddenham ~   
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   www.poppyrecords.co.uk   
      
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