Just a quick question, For curiosity i put my DMM on the heater pins of my tester with the filament voltage on 6.3 volts. I zeroed out the meter with the line test. I'm getting like 6.43 volts. My guess is this is due to the fact that todays wall voltage is higher then when this unit was produced. Am i on the right track with this therory?

Thanks

Is there a "Line" adjustment on that one?

Just a quick question, For curiosity i put my DMM on the heater pins of my tester with the filament voltage on 6.3 volts. I zeroed out the meter with the line test. I'm getting like 6.43 volts. My guess is this is due to the fact that todays wall voltage is higher then when this unit was produced. Am i on the right track with this therory?

Thanks

Possibly.

But, remember that without proper line voltage regulation, those 6.43 volts will fluctuate. The line voltage around here has varied from 100VAC to 124VAC, depending on a multitude of conditions (including how well the meter is calibrated, and its level of accuracy).

Measure the heater pins at the tube socket for a more accurate set of readings.

* * * USE CAUTION * * *

. . Falcon

Sounds pretty close to me... is that measured with a tube in the socket? A 6AQ6 (0.15A) or 6AS7 (2.5A)?

Heater voltages WON'T be exact on every tap, since the transformer has an integer number of turns- every tap is an approximation. The heater voltage WILL drop under load, and this drop is built in to the data tables. Some tube testers call for setting the line without a tube in place, some with a tube. Follow your tester's instructions. In the end, don't put too much trust in a tube tester - the circuit is the best tube tester.