[ARC5] ART-13 Power Output

[DSP3]

Not to re-open a closed discussion but I noticed that one (probably 
both) of my ARC-8 setups had apparently dropped in power output.  The 
p.s. for this system has the filament voltage at about 26.5 volts.  With 
the line voltage down a bit as a function of increased neighborhood 
usage (assumed), the ART-13 was putting out about 110 watts.  I noticed 
that the LV reading was down at the bottom of the arc, as was the 
drive.  So, I put a 20A variac in the line and bumped the line voltage 
up so that I got 28v on the filaments.  The low B+ came up from 380v to 
about 410v and the B+ from 1000v up to about 1150v.  The power out is 
now back to an easy 150 watts, which I re-tuned back to a nominal 125 
watts.  It would appear that filament voltage is more of a factor that I 
previously appreciated.  As I mentioned earlier, I use about 700pf of 
loading on 75 meters.  Anyway, as Chief Inspector Clouseau would say... 
"I have sol-ved the case".....

Jeep - K3HVG