atcomsystems.ca/forum Forums Other TDM Phone Systems Antique Telephones Replacing a Phone Mic

Howdy all,

Have to get this out of the way, first post!

Anywho, I have this gold radio shack phone I picked up at the thrift store where I work. And its missing a microphone.

I was wondering if putting in a new one was as easy as putting in the mic from a cheap hands free cell phone head set? Or is it more complicated then that?

The wires are all there, just the acuall mic is missing.

PS, I plugged it in and tested it to make sure it dials, rings, and the speaker works fine. So as soon as I pop this mic in I'm good to go.

PSS, the phone kinda looks like this: https://www.flickr.com/photos/37168239@N07/4606284839/.

First, welcome to the wacky world of old phones. The "microphone" is called a transmitter unit, and the thing that you listen to is called the receiver unit.

It probably takes a plain old T1 (tee one) transmitter from a G 3 handset, found on a typical 2500 set.

2500 head set? I'm not sure what that is.

I was thinking of something like this: https://www.xtremecellphoneaccessories.com/servlet/the-230/MOTOROLA-RAZR-V3-OEM/Detail. Something cheap, you can pick up at 7-11.

But then again, I don't know much about the world of phones (just that it'd be awesome to own a functional rotary phone).

2500-a basic touchtone phone. We often refer to phones as sets.
Arthur is talking about the transmitter out of a handset for a 2500 phone.

Now here's something to make your head spin https://www.telephonecomponents.com/transmitters.html

Problem is, by appearance, this is probably not a standard T-1 size. So now, you get to find an electret equivalent and that is going to be difficult unless something pops out at you.
Tough to do without the part.

Carl

I'd be willing to bet a quarter (BIG SPENDER!) that it's a little electret mike on a P.C. board, somewhat like you find if you crack open a NT 7XXX series handset.

are you talking about the phone i'm trying to fix, or the transmitter I'm replacing?

I opened up the....ear piece, and it looked alot like the Carbon Equivalent Electret EMS-94. two screws on the bottom of it, two wires leading into the head set and going...somewhere.

?????????

2500 TEL SET




G3 HANDSET, SHOWING THE GUTS. THE TRANSMITTER IS ONE OF THE TWO BLACK THINGS WITH THE HOLES, ON THE LEFT. THE BOTTOM ONE IS THE TRANSMITTER CAP, AND THE NEXT THING ABOVE IT IS THE T1 TRANSMITTER UNIT.

where can you get one of those 2300 phones? Or just the head sets, don't acually need the phone portion.

Come to think of it, can I just buy the transmitter?

If it is a standard carbon transmitter, but in the smaller [non-standard] size, check Phoneco in Wisconsin.

They will also have the standard carbon units.

Jim
**************************************************
Speaking from a secure undisclosed location.

It is a 2500 type telephone set. It is a handset.

I posted the exact pictures with their exact nomenclature, so that there would be zero confusion on your part. The telephone is illustrated so that you would recognize the most popular telephone set ever produced. The handset is likewise the most ubiquitous one in the country.

A T-1 transmitter is worth about $0.50 or less. If that's what you need, I'll send you one, free. If it turns out that you need a different one, take a measurement and tell us the dimensions. I'm sure that we have what you need. All we need from you is the right info.

fantastic! but....what exact measurements do you need? Or can I just tell you the model number and you look them up?

Diameter and model number.

Model Number is: 43-323B
Made by Radio Shack

I'll get you diameter later.

If you already know the source...Radio Shack....why not just go yourself and buy one?

That looks like an obsolete RS number...

Is that the part number of the entire telephone, or the part number of the microphone/transmitter?

In order:

because that number was (as far as I can tell) last used in the 80's. They don't support it anymore.

I do belive it is

and the entire phone.

oh, and diameter is 2 and 3/4 of an inches as far as I can tell.

Well Arthur you finally got that molar out now all you need is 2 bicuspids and an incisor. :rofl: :rofl: :rofl: :rofl:

The 2 wires you mentioned, what sort of termination do they have? Spade lug, TAB, solder, whatever?


Jim,PLEASE don't get Arthur started!

um....dunno whats with the teeth pulling reference, but ok.

Oh, and the 2 wires I mentioned, they have....a fork ending. 2 prongs screwed into the spot where the input modual would be going. Also, there are 3 prongs that look like where the input-er would be sitting. Like it would be sitting right on top of them (not sottering to be seen). I would assume that the two fork things could just be screwed into the input-er.

Finally, the two fork endings are separate 3 prongs I mentioned. And the circut is completed by connecting the fork endings to the prongs by way of screws.

I'm sure some of that is unclear, and that i'm using terms that are not right. Let me know what needs clearing up.

So that you're "in" on the joke, it took you SIX posts to tell us that the "diameter" of the hole where the transmitter fit is ~2 3/4". That's not good. LOOK AT THE 2500 SET PICTURE! On the left side, the T-1 transmitter capsule in a "G" handset is about 1 and 3/4 inches and the cavity it fits in measures 1 1/2" The only transmitters I distinctly remember that were that large are the (Hack, spit) AE Type 80 phones where everything was non-standard. The transmitter rests on two spring tabs and those "fork things" are called SPADE LUGS and it's standard in most any handset or phone.

If the whole purpose of your posts is because you want a cheap phone, send me $15 and a gently used 2500 set can show up on your doorstep, complete with a message waiting lamp. If your purpose is to restore this phone, then use the link to Phoneco above and start ordering parts.

Carl

I needed a good laugh and this set of posts has made my day. Thanks Matt, for being such a sport. I hope you were able to figure out what you needed.
And by the way, Welcome!

acually, no I didn't. What type of input modual do I need? :shrug:

and where can I buy/order it from? :shrug:

I found your phone here. Perhaps it will help others to help you.

https://www.etsy.com/listing/31357660/ornate-french-cradle-phone-vintage-70s

We really do want to help you, but you must make a small effort to help yourself. The easiest way is to try to use the proper words for what you need.

No one, other than you, has used the term "input modual" therefore we are not sure what that is.

I will repeat myself:

The item you seem to need is a TRANSMITTER UNIT.

They are cheap and plentiful in this industry. It will be easy to find one. We have offered to send one, free, and we have offered a commercial source for them. Call this company. (Click here)

transmitter unit! right, ok. still very new to this whole phone thing.

oh, and the link you provided isn't working.


is this something I could pick up from radio shack?

Odd. The link works for me. If the link doesn't work for you, try just cutting and pasting it into your browser.

Checking with Radio shack wouldn't hurt.

It's probably just an open cord lead, but I'm done here.

Well "I wonder where the thank you went" when you write to Sundance tech. support? :shrug: :shrug: :shrug:

"It's probably just an open cord lead, but I'm done here."
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Arthur, possibly, but he states in the first post that the microphone is missing. Open cord lead would not be surprising, thereby "compounding the felony".

Ha!

Found one at radio shack. Popped it in, and it works too!

Very awesome, first time you talk into your first rotary phone.


Just one problem. The part that screws onto the base of the head set (where the transmitter unit goes) is missing. I knew it was mission for a long time, I just thought the transmitter unit screwed into the head set.

So my question is very simple: can I just glue the transmitter unti to the head set?

Oh and for those of you who are following this thread and don't know, the transmitter unit use's contact points to connect electrically. There are no screws involved (didn't know that till today).

if glue will hold it I dont see why not ...

THIS is a "Headset". :rolleyes: :bang:

OMFG

This thread goes on and on why? :confused: :confused:

there seems to be more interest here in making snide remarks toward someone trying to do something beyond his skill level then in trying to help , even if it means recognizing terms used improperly

is it a matter of trying to show superiority ?

if you have nothing constructive to add then the best course might be to shake your head and just move on ....

sometimes the best response is no response

Rather than glue, try some RTV silicon. Sets up rubbery and if you can do it with little 'threads', it probably wont pick up too much 'handling noise'.

I disagree.

24 Sept: "G3 handset"

24 Sept: "Headset"

25 Sept: "Arthur is talking about a handset"

25 Sept: "two wires leading into the headset"

25 Sept: (photo) "G3 HANDSET"

26 Sept: "...or just the headsets..."

26 Sept: "IT IS A HANDSET"

5 Oct: "...screwed into the headset..."

Instead of criticizing those who try to help, why not try to understand their frustration?

If it frustrates and aggravates you so why do it ?

your right I cant understand the frustration ,life's to short even on hold ... ..I often have customers thanking me for my patience in dealing with them ....rather than teaching telephony 101 as long as I understand whats being asked I solve the issue ...

re read the thread I count 13 posts out of the 40 or so that add nothing ....

BTW "It's probably just an open cord lead, but I'm done here."

We all have our own style, I suppose.

Mine is to help when asked, and I have infinite patience with a person who tries to help himself.

The person asking, though, has an obligation to pay attention.

Accusing me of acting superior does not advance the cause, however.

Let's try to cut down on the name-calling, please.

Looks like the problem has been solved so locking this as it's gone on long enough. I think the best advice given was, if it gets to you just ignore it and move on.

Lots of folks stop by that don't know the proper terms. Don't forget many of people who come here have zero back ground.