Would like to measure the voltages using the Vectors. My wall outlet voltage is 122V. Does this mean that the values will be skewed upwards?
If I were to measure the voltages of a dual triode octal tube, am I to measure only on one Vector adapter? Which pins to measure on the 12AX7 adapter that I use with an additional adapter for octal tubes?
Since your wall voltage is 122, like mine, your heater voltage might be high, around 6.7, like mine. On the other hand, you have a LD III, whereas, I have an LD 1+, so different transformers....
Again, I prefer to take all measurements on the Vectors. In this way, it doesn't matter whether you are running a 6DJ8, 12AX7 or 6SL7.
To measure heater voltage, set meter to AC and measure across pins 3 and 4 on the Vector that is supplying the 9-pin adapter.
To measure Plate voltage, set meter to DC and measure across pin 5 and ground on each Vector. So you would have two readings, for the right triode and for the left.
To measure Grid voltage, set meter to DC and measure across pin 2 and ground on each Vector. Again, two readings, one for each triode.
Substitute your tube, amp and readings, and post like so:
A 1960 Heerlen, Holland E188CC running in an LD 1+:
Heater - 6.7v
Plate (R) - 81.5 Grid (R) - 3.1
Plate (L) - 81.5 Grid (L) - 3.1