EIA/RETMA codes

[Jon Kirwan]

Where does one look up the manufacturer, given the EIA or RETMA code
for them? I've got a part I'm trying to look up for EIA #491. But
I've no idea who that is. Google isn't helping me much.

Thanks,
Jon

 

[Phil Allison]

"Jon Kirwan"

Where does one look up the manufacturer, given the EIA or RETMA code
for them? I've got a part I'm trying to look up for EIA #491.

** Why are you hinding what the part is??

A good description and / or a pic may well allow someone to say straight off
who made it.

Then you will know what #491 indicates.

But I've no idea who that is. Google isn't helping me much.

** Try thinking a bit more laterally.



..... Phil

 

[Jon Kirwan]

"Jon Kirwan"

** Why are you hinding what the part is??

It's a transformer. I didn't know that it was important to state.
Sorry.

A good description and / or a pic may well allow someone to say straight off
who made it.

It looks about like your basic radio shack 12.6V @ 1A transformer,
except that it has two pairs of heavy gauge on one side and what
appears to be center-tapped, much thinner wire on the other side.

The only writing on it is:

46986P1
EIA#491
SEC-8941

No other markings.

Then you will know what #491 indicates.

I assumed the EIA#491 is the manufacturer and I'd hoped there was a
place to go to find it. I noted that, for example, Sylvania is (or
was, or some part of it was) #312. So #491 seemed findable. No luck
from my end.

** Try thinking a bit more laterally.

I can only try.

Jon

 

[Phil Allison]

"Jon Kirwan"
"Phil Allison"

It's a transformer. I didn't know that it was important to state.
Sorry.

** It kinda narrows down the range of possible makers - dramatically.

It looks about like your basic radio shack 12.6V @ 1A transformer,
except that it has two pairs of heavy gauge on one side and what
appears to be center-tapped, much thinner wire on the other side.

The only writing on it is:

46986P1
EIA#491
SEC-8941

No other markings.


I assumed the EIA#491 is the manufacturer and I'd hoped there was a
place to go to find it. I noted that, for example, Sylvania is (or
was, or some part of it was) #312. So #491 seemed findable. No luck
from my end.


I can only try.

** Chances are very high the maker is now long out of business as nearly
all consumer equipment transformer makers were wiped of the face of the
earth by Asian suppliers decades ago.

If you wanna know its specs - you will have to do a series of bench tests
on it.


...... Phil

 

[Jon Kirwan]

"Jon Kirwan"
"Phil Allison"


** It kinda narrows down the range of possible makers - dramatically.



** Chances are very high the maker is now long out of business as nearly
all consumer equipment transformer makers were wiped of the face of the
earth by Asian suppliers decades ago.

This was out of an old slide show projector device that I took apart
for its lenses and first surface mirrors.

If you wanna know its specs - you will have to do a series of bench tests
on it.

I've started that. I've identified what must be the 120VAC pair -- 5
ohms (using Tektronix DC meter), heavy wire, one black and one white.
Color seems confirming. The other pair of heavy wire, blue and
yellow, appears galvanically connected; but only about 1/4 ohm on that
pair and about a 1/4 ohm away from either of the black/white 5-ohm
pair. The CT set of three wires aren't galvanically connected to the
heavy wire side. (As I'd expect.)

Thanks,
Jon

 

[Phil Allison]

"Jon Kirwan" what the part is??

I've identified what must be the 120VAC pair -- 5
ohms (using Tektronix DC meter), heavy wire, one black and one white.

** A 5 ohm primary winding is consistent with a 120 VA transformer - not
12 VA.

The other pair of heavy wire, blue and
yellow, appears galvanically connected; but only about 1/4 ohm on that
pair and about a 1/4 ohm away from either of the black/white 5-ohm
pair. The CT set of three wires aren't galvanically connected to the
heavy wire side. (As I'd expect.)

** You are completely clueless.

Go try "sci.electronics.repair ".

Leave us alone.


....... Phil

 

[Jon Kirwan]

"Jon Kirwan" what the part is??



** A 5 ohm primary winding is consistent with a 120 VA transformer - not
12 VA.

Did I say 12? Look back. I think a pair of glasses may help.

** You are completely clueless.

Well, there is that.

Go try "sci.electronics.repair ".

Leave us alone.

No, thanks.

Jon

 

[Phil Allison]

"Jon Kirwan" <[email protected]

Did I say 12?

** See what you wrote at the top here ????????


** Well, **** you - bloody imbecile.

Well, there is that.


No, thanks.

** **** OFF - you DAMN TROLL




..... Phil

 

[Jon Kirwan]

"Jon Kirwan" <[email protected]

** See what you wrote at the top here ????????

Yes, I said it __looked__ like such a transformer. By that, all I
meant is that it was shaped like one, Phil. About the same
dimensions, weight, etc. You asked for a picture. I tried honestly
to provide that in words. Sorry about your misunderstanding me.

** Well, **** you - bloody imbecile.

Blame me for not using words you can follow. Oh, well.

** **** OFF - you DAMN TROLL

Sorry. I'm hear to stay, until I'm not.

Jon

 

[Jon Kirwan]

Sorry. I'm hear to stay, until I'm not.

_here_

Jon

 

[Jon Kirwan]

<snip>
...like using an oscillator set to 5V, 60Hz and applying it to the hiZ
(thin wire) side (which is very likely center-tapped); measure the lo Z
side to see what the turns ratio is.

I've a variac, as well. Might try that. Either way, I'll figure it
out. Mostly, I was curious about the manufacturer code, though. I
had hoped there was a nice little table to find. Not so far.

Thanks,
Jon

 

[MooseFET]

It looks about like your basic radio shack 12.6V @ 1A transformer,
except that it has two pairs of heavy gauge on one side and what
appears to be center-tapped, much thinner wire on the other side.

You can measure its turns ratio.

If you know that you may be able to get an better estimate of what the
heck it is.

 

[[email protected]]

Does it have flying leads? If so, You know there is a standard EIA
color code for these things?

What colors do you have, or are you suffering witth solder terminals?

I MAY be able to look them up, given the colors.

Steve

 

[Jon Kirwan]

See the power transformer color codes at, eg,
<http://tritium.fis.unb.br/Fis3Exp/fcim.csdc.com/fcimis/compid/ind/
transfor.html>, which are the same as shown in a couple of old
books I glanced at (Allied and ARRL handbooks). If the winding
with blue and yellow is a rectifier-filament winding, it might be
rated at 5V, 3A as for a 5U4 filament.

Thanks. This device does have a small lamp in it. It's rated for
19V, which may also give me a clue for the blue/yellow. There are no
tube filaments. Just the lamp. But your suggestion may very well
relate to this light bulb. Thanks.

Jon

 

[Jon Kirwan]

You can measure its turns ratio.

If you know that you may be able to get an better estimate of what the
heck it is.

Yes, I'll do that when I go into the attic and dig out the variac so I
don't have to take much risk.

Jon

 

[Jon Kirwan]

Does it have flying leads? If so, You know there is a standard EIA
color code for these things?

I didn't know. And it does. They are a kind of light orange for the
two on the outside and red for the middle one. With a magnifying
glass, I was also able to see markings on the wires. But after
looking over them all, most of what is there is impossible for me to
read. On the red wire I do see "STYLE 1589" (or it may be 1569) and
"300V" and "105C OR AWM". The light orange (there seems to be a hint
of pink to me) has "90C" on it, and "TR-?Y" where I can't read the ?
character and the Y might possibly be an N. There seems to also be a
"LL174??" where I can't read the ?? characters.

What colors do you have, or are you suffering witth solder terminals?

Those above are on the side that doesn't accept the 120VAC and are
much thinner wires.

I MAY be able to look them up, given the colors.

That surprises me a bit. With custom designs abounding, it seems that
all manner of shades would be needed and one may require a "color
checker's" eye to figure out and match colors up.

Thanks for any thoughts here,
Jon

 

[Jon Kirwan]

H.W. Sams used to publish the list every couple years as an extra to
one of their Photofact sets. A lot of people on
have large collections of Sams Photofacts
and should have the lists. I didn't find 491 on the 1957 or 1958 lists
so it is older than that.

I found them at: <http://www.audiophool.cjb.net/Techno.html>

Does anyone have information on EIA code 491 for Jon?

Thanks. Do you mean "older" or "newer" though? This transformer
can't be older than 1958. So I'm assuming you mean later, so that it
didn't make those earlier lists.

Thanks,
Jon

 

[[email protected]]

Based on what you have described to me, its Plate B+ -center tap-
Plate B+

Steve

 

[Jon Kirwan]

The numbers were supposed to have been assigned in sequence. Gaps in
later lists were due to mergers and businesses going under. Supposedly
some were either reassigned, or an old name emerged, when a division was
spun off.

Prior to the EIA numbers, companies were identified with a letter or
two. Unfortunately, you have to join the EIA to access the full data.
The lists that were published by Sams may have been limited to companies
who made radio & TV parts. Old HP, Tektronix and military electronics
manuals had a list of all vendors & their codes, but if 491 was a small
company, you may never track them down that way.

Thanks. That's a concise explanation and it clarifies my difficulties
finding the number, too. Very helpful. I'll just test it with the
variac and be done with it.

Jon

 

[Jon Kirwan]

Based on what you have described to me, its Plate B+ -center tap-
Plate B+

Okay. I'm going to test it anyway, but I take it this is what the
color code suggested. Thanks.

Jon