That just helps to confirm my advice that I think you have a bad/dirty or broken contact in the setting I described above .
For those not used to repairing tube testers switch contacts wear down over time especially on a well know and popular range of tubes like the 6V6 --seen it many times before ,you will have to take time to check the row of switches at the bottom at the position I have posted , and if worn might take more than a "schoosh" of switch cleaner as we are not dealing with an audio signal but a voltage containing current enough to cause sparking and blackening of the contacts .
I have even seen a whole chunk taken out of a switch contacts and make sure enough pressure is applied to each contact in that position ---NOT a "5 minute job " .
For those not used to repairing tube testers switch contacts wear down over time especially on a well know and popular range of tubes like the 6V6 --seen it many times before ,you will have to take time to check the row of switches at the bottom at the position I have posted , and if worn might take more than a "schoosh" of switch cleaner as we are not dealing with an audio signal but a voltage containing current enough to cause sparking and blackening of the contacts .
I have even seen a whole chunk taken out of a switch contacts and make sure enough pressure is applied to each contact in that position ---NOT a "5 minute job " .
When you say to make sure to apply enough pressure, are you talking about cleaning? The connectors on the switches all look pretty black, but measured voltages in the sockets are fine. Should I apply contact cleaner, but diligently? I have a brass brush I could try to use as well.
I am talking about the pressure applied by the switch contacts in the 6V6 position .
You say its only the one set up code that's not working and other tubes test okay so that should rule out the test switch .
Its one thing saying --"the voltages are okay" but have you tested them when under load ?
I take it you have already tested a variety of tubes and they test fine ?
You say its only the one set up code that's not working and other tubes test okay so that should rule out the test switch .
Its one thing saying --"the voltages are okay" but have you tested them when under load ?
I take it you have already tested a variety of tubes and they test fine ?