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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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11th Jun 2022, 6:59 pm | #21 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: Magneto phone generates no ring voltage
Joe, I'll be disappointed if you and your mates didn't have SCR-536 handie talkies like "The Terrible Ten"
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-- Graham. G3ZVT |
12th Jun 2022, 5:57 am | #22 |
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
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Re: Magneto phone generates no ring voltage
I took the magneto assembly apart. Here are some pics. I'm unsure of the correct names for the various parts.
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12th Jun 2022, 6:16 am | #23 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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Re: Magneto phone generates no ring voltage
One can put a NE2 bulb between the wires of f the generator and it should light if there is voltage. IIRC they strike between 60v and 90V. I have used old military field phone gennys to light the bulbs up.
The phone PS I have generate 90V for the ringer line.(likely less by the time it reaches the house). I was rewiring the house phone lines and someone rang in. It was a pretty good jolt, as I was holding the lines at the time. |
12th Jun 2022, 8:12 am | #24 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
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Re: Magneto phone generates no ring voltage
Roger Ramjet,
NO !! it wasnt fence lines, but a single THICK copper wire. From memory ( and I am talking of my memory 60 years ago ) It was hard drawn copper about 1/8" thick ( 3mm in todays dollars, near enough ) Single insulator and not very high above the ground. Perhaps ten foot at the droop point. The same phone line STILL exists!!!, and I have always wondered why some idiot hasnt pinched the copper wire!!. I would show pics except I moved to the next village 3000 kilometres by road north, so I cant take pics today. Joe Last edited by joebog1; 12th Jun 2022 at 8:13 am. Reason: spello |
12th Jun 2022, 8:16 am | #25 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
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Re: Magneto phone generates no ring voltage
Peter in Parkes,
That armature doent look in very exciting condition !!. It may be black enamel ( which in itself is a disaster ), but it could be cooked. It is VERY black!!. UNless you have the patience of Jobe, rewinding is out of order. Joe |
12th Jun 2022, 9:13 am | #26 |
Heptode
Join Date: Feb 2022
Location: Leicestershire, UK.
Posts: 690
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Re: Magneto phone generates no ring voltage
Yes the coil does look cooked but I wonder how that could happen even if the output was overloaded. Could it be an incoming lightning strike on the line ? Clearly, the magneto is disconnected until turned - although a high transient voltage would make short work of that !
In any event the bell & capacitor would be first casualty. That said the bell capacitor did look a bit cooked also ? Rog |
12th Jun 2022, 10:00 am | #27 |
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
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Re: Magneto phone generates no ring voltage
I’m not too alarmed as I pulled apart a good working magneto to check its state.
Pics attached |
12th Jun 2022, 10:12 am | #28 |
Heptode
Join Date: Feb 2022
Location: Leicestershire, UK.
Posts: 690
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Re: Magneto phone generates no ring voltage
Good move Peter......cannot see clearly on your piccy's so does the coil on the working unit look similar the the blackened coil on the faulty one ?
Rog |
12th Jun 2022, 10:31 am | #29 |
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
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Re: Magneto phone generates no ring voltage
I'll let you guys be the judge.
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13th Jun 2022, 2:31 am | #30 |
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
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Re: Magneto phone generates no ring voltage
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