Author Topic: French Grammont Marty 1910 schematic needed  (Read 1576 times)

Offline newphoneguy

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French Grammont Marty 1910 schematic needed
« on: March 09, 2016, 05:02:25 PM »
Recently I got a nice Grammont Marty 1910 French telephone. I found it on my grandmother atic, just finished the cleanup of this nice phone, and would like to restore it to working condition, it remains all the original componentes inside, but do not have the schematic of this phone. If anybody can help geting it wiil be greatly appreciated
here is a picture of my phone just cleaned.

unbeldi

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Re: French Grammont Marty 1910 schematic needed
« Reply #1 on: March 09, 2016, 05:59:08 PM »
Welcome!

I think the phone has a connector bar of two rows of screws.  The diagram is very simple for these.

This is a local battery telephone, which means that the transmitter is powered not from the telephone line, but from a separately connected battery of two or three cells, i.e. 3 or 4.5 V

In addition, the phone should have connection points for L1 and L2, the telephone line.

Can you show some inside pictures?  Is the inside wiring still in place too?   It's very nice piece of history.
I think I found a diagram for this or a similar one at one time.
« Last Edit: March 09, 2016, 06:01:54 PM by unbeldi »

Offline newphoneguy

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Re: French Grammont Marty 1910 schematic needed
« Reply #2 on: March 09, 2016, 06:20:04 PM »
Here are some pictures from the inside. Certainly on the connector panel there are two connection points for L1 and L2 , on the connection panel start to the left with M and M , then is R1 and R1, then S3 , then is CM and ZM , then is S2 and S, next is L1 and L2 , and finally on the right is R2 and R2. when I opened it for the first time the line cord that has 6 wires were connected on this way. the blue to L2 , the white to L1 the red to S2 the green to S, the yellow to CM and the brown to ZM . but I do not know if it was rewired . my land line only has two wires, green and red. I think these go to L1 and L2 . I connected on this way but does not work, no sound, nothing, I cheched the internal transmitter capsule and is OK, I checked it on another phone I have and works propely, also the receiver is OK. the coils are OK. 1 ohm the primary and 160 the secondary as are printed on the otside of the coil. There is no capacitor on this phone, usually there is at least one capacitor inside the phones but on this one when I got it there was none. The magneto is ok. once I cleaned it generates the proper voltage. 48 to 60 volts.

unbeldi

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Re: French Grammont Marty 1910 schematic needed
« Reply #3 on: March 09, 2016, 06:43:46 PM »
Here are some pictures from the inside. Certainly on the connector panel there are two connection points for L1 and L2 , on the connection panel start to the left with M and M , then is R1 and R1, then S3 , then is CM and ZM , then is S2 and S, next is L1 and L2 , and finally on the right is R2 and R2. when I opened it for the first time the line cord that has 6 wires were connected on this way. the blue to L2 , the white to L1 the red to S2 the green to S, the yellow to CM and the brown to ZM . but I do not know if it was rewired . my land line only has two wires, green and red. I think these go to L1 and L2 . I connected on this way but does not work, no sound, nothing, I cheched the internal transmitter capsule and is OK, I checked it on another phone I have and works propely, also the receiver is OK. the coils are OK. 1 ohm the primary and 160 the secondary as are printed on the otside of the coil. There is no capacitor on this phone, usually there is at least one capacitor inside the phones but on this one when I got it there was none. The magneto is ok. once I cleaned it generates the proper voltage. 48 to 60 volts.

Ok, just as expected.
The phone cannot work on a modern telephone line, because it uses a local battery to power the transmitter.  As you found, the primary winding of the induction coil has only 1 ohm resistance.  The reason for such a low resistance is that it presents very little load to a battery, so very little energy is wasted into heat, rather than for converting sound into electric signals.   A telephone line that was used for this phone did not have any DC voltage present from the exchange. Therefore, no capacitor was needed in the circuit.

The R1 terminals go to the receiver, R2 terminals go to a second receiver if it is present, for a second person to listen in, M terminals are for the microphone (transmitter), CM and ZM are for the battery, which is in series with the transmitter, S (sonnerie) terminals are for a ringer, and L1 and L2 indeed are the telephone line.

The six-wire cord undoubtedly provided L1 and L2, and the connections for the battery and for the ringer, which would both be mounted on a wall somewhere.


« Last Edit: March 09, 2016, 06:47:07 PM by unbeldi »

unbeldi

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Re: French Grammont Marty 1910 schematic needed
« Reply #4 on: March 09, 2016, 07:02:55 PM »
Ok, I found the diagram for you, and the original source:

http://alain.levasseur.pagesperso-orange.fr/page6.htm

Offline newphoneguy

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Re: French Grammont Marty 1910 schematic needed
« Reply #5 on: March 09, 2016, 07:09:20 PM »
 unbeldi. you have saved me a lot of work. I did not know this phone requiresa battery for the transmitter. my plan is to use this nice phone as my daily telephone on my land line. with the magneto removed from the inside there is plenty room for a dial, I cut the front wooden case and installed a small drawr to fit a dial. this is my plan. now that I know this coil is not useful with the modern lines I think will be better to replace it maybe with a WE 101 coli and use a WE 202 schematic or something similar to put this guy to work . Appreciate so much your attentions. everyday one knows something new. Thanks.

Offline LarryInMichigan

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Re: French Grammont Marty 1910 schematic needed
« Reply #6 on: March 09, 2016, 07:24:35 PM »
That is a great phone you have found.  I would very strongly suggest that you not make any modifications to it because they will reduce the value of the phone considerably.  Many collectors will be willing to pay a high price for an original phone in that condition.

Larry

Offline newphoneguy

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Re: French Grammont Marty 1910 schematic needed
« Reply #7 on: March 09, 2016, 07:43:55 PM »
yes , I think is also a great phone and in very good condition, it took me almost a week to clean it as it is now. but, I do not think to sell it. my plan is to use it daily on my home. and on the original condition will only be for exhibition. and I want to use it, so I have decided to remove the magneto , I will preserve all teh original parts, already I did the modification on the wooden case. I have opened a small drawer to fit a dial . with the drawr closed the modifications will not be visible, and will let me do outgoing calls. at the momento my grandfather told me it was complete with a ringer so I need to look carefully on their attic to see if it is there.  here is a picture of the drawewr opened, with the dial , although I have not wired it yet. I am on the process of wiring it properly so it can be used daily

unbeldi

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Re: French Grammont Marty 1910 schematic needed
« Reply #8 on: March 09, 2016, 08:21:52 PM »
unbeldi. you have saved me a lot of work.

I wish I could have saved the phone. :'(

Offline newphoneguy

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Re: French Grammont Marty 1910 schematic needed
« Reply #9 on: March 10, 2016, 09:52:11 AM »
I was lucky. my grandmother called me to help cleaning her attic. And when she saw I liked this old phone she gave to me, I will go back next weekend to look for the ringer box my grandfather told me this phone also has when it was on service. It will take to me sometime to make it work.