[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.

[daveone23]

I found a broken wire from the end og the 300 ohm line adjust to the transforner but i dont think its needed. The transformer is still getting line voltage.

[daveone23]

Iam only getting 4vac out of the tranny
For the 80 filament. The line rheostat
Looks fine and the tranny is getting 116vac. Why does the line adjust show 133vac.

[DaleHCook]

The 300 ohm line adjustment is used to set the primary of the transformer to a nominal voltage for any line voltage from 100 to 130 volts. Although that nominal voltage does not seem to be specified in the manual it should be 115 or 120 volts.

[daveone23]

Iam getting closer to fixing it. I bumped
Up the tranny voltage to get 5v on the 80 tube. I gan get the needle to move only
When i move the "quality rheostat".
https://www.dropbox.com/scl/fi/f618y6ai6...bm5k3&dl=0