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Re: [TCML] Repair/restore of an old induction coil
Your description sounds like the Electrotechnic Products 3-inch coil. Some
of those and the Pontiac coils seem very similar.
I've found new caps like that recently at hamfests for about $1 each, much
cheaper than in stores or online.
You might also want to check the condition and adjustment of the contacts.
I also like to disassemble the interrupter assembly and clean all the metal
surfaces which touch each other to insure a good connection.
You could also remove the base and inspect the tar insulation inside to try
to see if there is any arcing through cracks in the tar. You could run it
and watch for any sparks inside the case.
Good luck with it!
Tedd
----- Original Message -----
From: <mrapol@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, September 30, 2013 8:14 PM
Subject: [TCML] Repair/restore of an old induction coil
I just acquired a rather large Ruhmkorff type induction coil, circa 1920 or
so. After cleaning the contacts I get a modest spark but such a large coil
ought to be good for more. There are three ancient condensers, and I
suspect at least one is bad. Each is rated at .45 MFD and 400 volts. They
are linked in parallel and are easily accessible. If I replace the
condensers, should I cleave exactly to the original setup, or could I use
other configurations to achieve the same capacitance, etc?
The coil was made by the Pontiac Coil Company, and it's about 14 inches
long by 7 wide.
Paul Thompson
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