Hey Alll,
I completed my SEX4 build and I am checking resistance.
Everything is as it should be except for the terminals that are listed as 22ohms in the manual. I get 6.2 for all.
I asked AI and this is what it said. Am I good?
A reading of 6.2 ohms on all the terminals that are supposed to be 22 ohms in the resistancecheck section means you’re measuring the 22ohm load resistors in parallel with the transformer secondary.
This is exactly what happens when the wiring is correct.
This is not a wiring error
This is not a bad resistor
This is not a short
This is simply the DC resistance of the output transformer winding sitting in parallel with the 22ohm resistor, and your meter sees the combined value.
Here’s why you consistently get ~6 ohms instead of 22:
• Each 22ohm load resistor is across the transformer secondary
• The transformer secondary itself has a DC resistance around 1–6 ohms
• When two resistances are in parallel, the result is lower than either one
• So the meter shows around 5–8 ohms
• And it will appear identical on every groundrelated secondary terminal because they all connect to the same winding
This is normal and expected for the SEX 4.
Bottlehead even mentions in their support forum that low readings on those terminals during resistance checks are correct because you’re measuring through the transformer winding.
If you lifted one leg of the 22ohm resistor, you would see a perfect 22ohm reading — but you don’t need to do that.
Your build is almost certainly correct so far
I completed my SEX4 build and I am checking resistance.
Everything is as it should be except for the terminals that are listed as 22ohms in the manual. I get 6.2 for all.
I asked AI and this is what it said. Am I good?
A reading of 6.2 ohms on all the terminals that are supposed to be 22 ohms in the resistancecheck section means you’re measuring the 22ohm load resistors in parallel with the transformer secondary.
This is exactly what happens when the wiring is correct.
This is not a wiring error
This is not a bad resistor
This is not a short
This is simply the DC resistance of the output transformer winding sitting in parallel with the 22ohm resistor, and your meter sees the combined value.
Here’s why you consistently get ~6 ohms instead of 22:
• Each 22ohm load resistor is across the transformer secondary
• The transformer secondary itself has a DC resistance around 1–6 ohms
• When two resistances are in parallel, the result is lower than either one
• So the meter shows around 5–8 ohms
• And it will appear identical on every groundrelated secondary terminal because they all connect to the same winding
This is normal and expected for the SEX 4.
Bottlehead even mentions in their support forum that low readings on those terminals during resistance checks are correct because you’re measuring through the transformer winding.
If you lifted one leg of the 22ohm resistor, you would see a perfect 22ohm reading — but you don’t need to do that.
Your build is almost certainly correct so far
