Tektronix 120-120 transformer - Page 1
Forum section: electronics / general

author: electronics-whiz
author_rank: Regular Contributor
timestamp: February 13, 2014, 04:25:57 pm
content: I was talking to a friend the other day that is electrical instructor at local college. He gave me this transformer said they had an old tube type scope die, and pulled this out of it. I kind of googled it, but i'm not seeing any specific info on the terminals for this model. Acording to the info i have found it is a factory original from a 545A tektronix scope.I have seen info on some other similar transformers, but there like 120-140 or something. I don't know if there the same or not.Also i see some stuff about 6.3 V heater, he told me it would have a 300V output for a tube heater. so i'm not real sure what the 6.3 is about. I saw something i think was on something at the geek group, saying something about the 300V and 6.3 are like linked, but i didn't understand what they meant, because was kind of confusing.I'd like to know what the terminals for this do, or if i should just go by specs of a 120-140 or some other model.Normally i can kind of tell with transformers, but this has so many terminals, and i can't see the wires to guess at whats what, i'm just about to take an ohm meter to it to see what i may find out.Right now i'm thinking about using this to drive an old gas laser tube. I inquired about the specs for the tube, it apears i need heater, and 1500-1800V DC to run it.

author: electronics-whiz
author_rank: Regular Contributor
timestamp: February 13, 2014, 06:56:32 pm
content: I think i got it figured out, once i looked at it made since, a pair of posts were bonded so i figured that's likely primarys in parallel. I used ohm meter to find the others, one post 29 is linked to post 19 which is a 6V output. I'm not sure what that does, it also has a bare wire on it i think may have been linked to GND of some sort. found has a 200V out, and 2 110 outputs that can all so be 220. Don't look like laser will be practical with this, unless i use a flyback of some sort to get the 1500-1800V. I don't know what i'll do with it now, may be decent bench supply with some work. Maybe an isolation transformer, but i don't think the 110 outputs are rated for much.

author: shortwave
author_rank: Newbie
timestamp: February 22, 2014, 01:23:10 pm
content: Hello, I have been looking for a 120-120 transformer for a power supply I'm building. Would you consider selling it to a good home?Go here for some information on Tek power transformers:http://www.pmillett.com/Tek_xfmrs.htmRegards, Rob.

author: electronics-whiz
author_rank: Regular Contributor
timestamp: February 22, 2014, 06:54:40 pm
content: hello shortwave, i'd have to give that some thought. Right now i only use for the 240 out primarily, and occasionally the 6V. I have other supplies for low voltage, and most those are DC and that's usually what i use. I have a few other things i'd like to do with it next week, then i don't see using it much after that.I was hoping it had a good 300V heater output and a CRT driver, but it don't so i can't use for laser like i had planned to. Near as i can tell the heater isn't even needed since i had running from a CRT flyback.

author: shortwave
author_rank: Newbie
timestamp: February 22, 2014, 08:27:26 pm
content: If you decide you don't need it and wish to let it go, let me know.

author: electronics-whiz
author_rank: Regular Contributor
timestamp: February 23, 2014, 05:23:29 am
content: I'll let you know what i decide to do, may be early the week after. I realized next week i may not get done what i had hoped to do with it.