• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Power Transformer mystery lead....

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
HI

i recently got a few old chasis with transformers on them that i want to use for parts. i figured out what leads are what with a function generator and a meter (measuring intuctance and continuity etc..)

however on 2 of the power transformers there seems to be an extra wire that is not attached to any other winding. one of them has line in, a pair for high voltage out and a pair for heater voltage and then... mystery wire on

the other one is much older and has a pair center tapped high voltage out, a center tapped 12.6v heater output a 5 volt heater pair and then a wire that does not appear to be inuse with any other winding.

any ideas? i have not plugged in mains level voltage to these, jsut testing with lower voltages and doing the math.

perhaps they are damaged?

any help appreciated.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.