1a30e4a0   
   From: phil_a@tpg.com.au   
      
   "Engineer"   
      
      
   > PS probably choke input as was common back in the day.   
      
   **************  No, it had a CLC B+ filter from a 510-0-510 PT, so   
   loaded B+ would be quite high, e.g. 600VDC or more.  The choke was   
   huge, too.   
   Type 10-300X Choke   
   10 H @ 300 mA   
   63 ohms   
   Max 800 V winding to core/chassis   
      
   > 250 Watts unlikely, half that is possible in AB2.   
      
   *************  Agreed.  250 was just the speculation of the chap I got   
   if from.   
      
   **  Not so far off what is likely.   
      
   See RCA data on the 807:   
      
   http://www.triodeel.com/807_p4.gif   
      
   In your case, the DC supply under load is about 600 to 650 volts.   
      
   The screens would be fed from a voltage divider and electro cap to ground to   
   give some peak current ability with speech.   
      
   The Hammond OT would be run with double the rated load impedance so the   
   primary Z is also double or 3800 ohms.   
      
   The conditions in the column beginning with 600V then apply to 4 tubes.   
      
   So 160 watts or so.   
      
      
   ....   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)