Power Transformer mystery lead....

skittletata · 3rd April 2008, 03:26 AM

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.

SY · 3rd April 2008, 03:31 AM

It's probably a shield. If so, it should be grounded to the chassis.

skittletata · 3rd April 2008, 03:40 AM

ok ya i thought maybe as much but i have never actually seen such a thing. thanks for the insight.

3rd April 2008, 03:26 AM	#1
skittletata diyAudio Member Join Date: Mar 2007	Power Transformer mystery lead.... 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.

3rd April 2008, 03:31 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	It's probably a shield. If so, it should be grounded to the chassis. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
My mystery transformer.	azira	Solid State	4	9th September 2007 06:42 PM
Transformer - mystery VA	seventenths	Power Supplies	10	5th September 2007 05:47 PM
How to deal with Lead free Power Fets.	macka	Pass Labs	2	11th August 2007 12:07 AM
Mystery transformer	Ty_Bower	Tubes / Valves	2	15th June 2007 12:24 AM
Sonic impact, which power lead is +ve?	gilbodavid	Class D	2	3rd November 2005 05:22 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

3rd April 2008, 03:40 AM	#3
skittletata diyAudio Member Join Date: Mar 2007	ok ya i thought maybe as much but i have never actually seen such a thing. thanks for the insight.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)