[AMRadio] RE: GB> The True Variac

Merz Donald S merz.ds at mellon.com
Tue Sep 20 14:37:06 EDT 2005

Reminder to all--I still have five copies left of the Variac manual below...

General Radio "Handbook of Voltage Control With The Variac Autotransformer." This little treasure is a reprint photocopy of a 40-page booklet published in 1963 by General Radio Company which "designed, patented, introduced and manufactured" the Variac sometime around 1933. It is in an 8.5 x x11 format. The booklet contains 12 pages on Theory and Principles, 19 pages on circuits using Variacs and 8 pages on specific Variac applications. All the GR Variac models are discussed in detail including connection diagrams and so forth. One section shows how to use Variacs in series and parallel applications (with the use of a choke to prevent current oscillation when the 2 Variacs' brushes are not perfectly synchronized). Motor-driven Variacs are also discussed. In short, this may be all you ever wanted to know (and then some) about the mighty Variac. $10.50 PPD. Five copies left out of 25.

73, Don Merz, N3RHT

-----Original Message-----
From: owner-glowbugs at piobaire.mines.uidaho.edu
[mailto:owner-glowbugs at piobaire.mines.uidaho.edu]On Behalf Of Ralph
Sent: Monday, September 19, 2005 8:06 PM
To: glowbugs at piobaire.mines.uidaho.edu
Subject: GB> The True Variac

Can anyone supply the specs for a General Radio
Model 200B Variac? The unit is removed from a
1947 Raytheon diathermy apparatus. The variac
looks heavy enuff for at least 10 A.

This thing is interesting because GR has the name VARIAC
embossed into the bakelite frame. It appears that GR may
have originated the variac name which has now become
generic for all variable transformers of the general type.

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