[Milsurplus] Fixing up an I-177B tube tester

[WA5CAB at cs.com]

#1
The original meter rating is 0-1.4 MADC.  


In a message dated 3/25/2011 1:45:46 PM Central Daylight Time, 
ianmwilson73 at gmail.com writes: 
> I would have thought this was easy enough that I could figure it out; but 
> I
> could
> use some help here.
> 
> Problem #1: can't adjust line to correct meter position
>   It reads low. If I crank it up to max the meter reads in the white zone
> just below
>   the correct line position. However, this gives excessive filament
> voltages. I have
>   measured all the resistors I can get to easily (especially the meter 
> shunt
> and
>   series resistors when in LINE mode), and have checked both rectifier
>   tubes. Unless the meter sensitivity has changed over time, I'm stumped.
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480