[daveone23]

This tube tester wont work to test tubes or center the needle but works on DC volts. I checked the line adjust rhehostat and it measures 270ohm. Schematic calls for 1000ohms. I dont really see when it connects to the rest of the circuit in the schematic. Where should I start tracing?

[DaleHCook]

The other end doesn't connect to anything - it is not being used as a potentiometer, it is being used as a rheostat.

[daveone23]

I get that part of it. I moved the switch to the line adj position on the schematic. As you can see it goes no where.

[DaleHCook]

Now I understand. Your schematic has been altered. The original is on Steve Johnson's site at:

599, 599-C Schematic No. 2315-C (4/11/45)

[daveone23]

Yes its been altered. I did that to
Show the switch is not in the A position.
Line adjust is another detent. Look at
Your link, you will see the other detent. Its
Shown in the A position.

[DaleHCook]

There seems to be something wrong with that schematic - in the Line Adjust position that 1k potentiometer should be in series with the meter. See the schematics for the similar 589 and 589-A testers.

[daveone23]

Good catch. The 589 is a better schematic but i dont understand how the voltage goes thru the meter to adj the line voltage on the meter. I tested the 300ohm rheostat and while it ohms out the voltage is steady 118vac thru the adjustment.