From: jcandela@prodigy.net   
      
   On Monday, May 22, 2017 at 5:38:13 AM UTC-5, johnn...@gmail.com wrote:   
   > OK Jim, I found a copy of the schematic. The cct is a variation on something   
   somewhat common with old guys like us back in the day, convert down to the BC   
   band & use an ordinary receiver to do the tuning. I did two of them, one for   
   my old Ford car.   
   >    
   > So the front end does a block conversion in this case & the 2nd IF does the   
   tuning, a slick way to get good image rejection. The preselecter completes the   
   job.   
   >    
   > Given the cct constants a B+ of 180V seems unlikely, 140-150V is possible.   
   The first filter cap is shewn as 50 microF & is a problem for the PT. The peak   
   currents are limited only by the PT wdg R's. Better stuff in something like   
   100R in series with    
   the PT HV secondary to limit the peak charging currents. It is the RMS current   
   that heats & kills transformers, not so much steady currents.   
   >    
   > I noticed somewhere on line 5W audio mentioned. I think one Watt more   
   likely. Rather then surgery to do a triode output & driver,if there is space   
   there should be some kind of suitable OPT that would improve the sound.   
   Hammond has several designed for    
   SE output. But rather expensive now.   
   >    
   > If the NE2H neons are still working keep them in the cct as is. The B+ will   
   be about the same as original, no need to complicate with Zeners. My own   
   experience with zeners as the voltage increases so does the change with   
   temperature. As the zener heats    
   up the voltage drifts with it.   
   >    
   > Looks like a very good radio.   
   >    
   > Good Luck, John L Stewart   
      
   John,   Thanks for the very thoughtful reply. The Mosley CM-1 has an   
   interesting history. The designer, John Clemens, W0BD was interviewed in 2013   
   about his receiver. John was 90 years old then. Here is the video:   
      
   https://twit.tv/shows/ham-nation/episodes/129   
      
   Fast forward to 15:00 minutes...   
      
   Here is where I got to thinking about a triode audio output tube:   
      
   http://our-house.jp/6AW8/index.htm   
      
   Jim   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)