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RADIO BROADCAST ADVERTISER
63
Protect yourA'C tubes
from high line voltages
'with
Ward Leonard Vitrohm Resistors and Rheostats
Radio receivers, made for complete operation from the power lines, are designed, usually, to operate at a fixed line voltage. Where the line voltage exceeds the arbitrary value assumed by the set manufacturer, damage to the tubes may result unless means are used to reduce the line voltage to the value at which the set is designed to operate.
Two methods are used, ordinarily, to correct for excessive line voltages ; a resistor or rheostat placed in series with the input to the power unit of the receiver. The resistance value and current carrying capacity of these units is determined by the receiver primary current and the maximum potential drop required. Vitrohm Resistors, fitted with Edison medium screw bases, are the most convenient units to use where fixed resistance is desired. These resistors screw into a series tap which is in turn plugged into the convenience outlet or socket. They are priced at $2.00 each and are available in the resistances listed below:
Catalog Number
Resistance In Ohms
Catalog Number
Resistance In Ohms
507-96
2.5
507-97
15
507-39
3.5
507-98
22
507-41
5
•507-99
31
507-43
7
507-100
45
507-44
10
507-101
62
507-45
12.5
Vitrohm 4-inch, 11 step, Rheostats are used where adjustment of voltage is desirable or necessary. Mounting may be either front or back of panel. The price is $5.50 each.
Catalog Number
Maximum Resistance In Ohms
507-83 507-59 507-63
12.5
20 50
Your dealer stocks Vitrohm Resistors and Rheostats, or can get them for you. Circular 512 describes methods of line voltage control and shows complete diagrams of circuit connections. It will be sent to you promptly upon request without charge.
WARD LEONARD ELECTRIC CO.
MOUNT VERNON, N.Y
RESISTOR SPECIALISTS FOR MORE THAN THIRTY-SIX YEARS