Sent: Wednesday, November 05, 2014 4:58 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Repairing an old Sargent Welch 2390 solid
stateinductioncoil
Hi Paul, if you can wait a day or two, I can send you a photo of the inside
of mine.
Tedd
----- Original Message -----
From: "Paul B. Thompson" <mrapol@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, November 05, 2014 2:56 PM
Subject: [TCML] Repairing an old Sargent Welch 2390 solid state
inductioncoil
(If this is OT, please let me know).
I just got my hands on a vintage Sargent Welch 2390 induction coil. The
upper half consists of a standard wood-case primary & second, topped with
HV terminals. Instead of interrupter, there's a sheet metal case filled
with the necessary components to operate the coil with wall current.
There's a On light, an on-off switch, a power level control (a
potentiometer), and a polarity switch. Unfortunately the coil does not
work. The power light comes on when the on-off switch is operated, but
there's no HV output. There are three wires in the base that are broken
loose and I'd like some advice about where to reattach them. No circuit
diagram came with the device, and I haven't been able to find one.
There two terminals used on the power level pot. A purple wire from the
outside terminal is loose; the center terminal of the pot has remains of
solder.
There is a black wire connected to the center post of what looks like a
small transistor. The other end of this wire is floating free.
There's a white wire with brown stripe connected to one of two small
transformers in the base. This wire is unconnected on the other end.
The whole device pretty crudely made--thick, clumsy soldering, etc., but
I'd like to get it working. Any ideas how to reconnect the wires?