New Plug For Patch Cords

Although known primarily as an instrument manufacturer, General Radio has developed many components and parts that achieved industry-wide popularity. Notable among these was the "banana" plug, introduced in this country by GR in 1924 and manufactured ever since by us as the Type 274 Plug. The present crop of banana plugs includes single, double, insulated, and shielded varieties. Two patch cords, each consisting of Type 274 double plugs molded on both ends of a shielded cable, have also been available.

A new lineup of 12 Type 274 Patch Cords offers (1) a new, improved double plug, (2) a choice of straight-through or right-angle connection to the plug,

(3) a wider choice of lead lengths, and

(4) new single-plug patch cords.

The new double plug consists of two banana plugs, one gold-plated and one nickel-plated, whose soldered ends are encapsulated first in polystyrene (for its electrical qualities) and then in cellu lose-acetate butyrate (for its high-impact properties). At the other end of the connector body are two banana-plug jacks, and the configuration of the connector is such that any double plug can be connected to any other, regardless of whether the plugs have straight-through or right-angle connections (see Figure 2).

The gold and nickel color coding of the banana plugs is in accordance with electrical wiring conventions (the nickel is the shield, or ground connector). In addition, the word shield is clearly marked next to the shield terminal.

Double-plug patch cords are now available in 1-, 2-, and 3-foot lengths, with either straight-through or right-angle connections. Leads are made of low-capacitance, flexible coaxial cable.

The single-banana-plug patch cord is shown in Figure 3. It is available in either red or blaek and in three lengths: 9, 18, and 36 inches. The connector body

Figure 2. Recess in body of new double plug means any two plugs can be stacked.

is molded cellulose-acetate butyrate and includes a jack for stacking. The banana plug's versatility allows quick conversion of the patch cord to an alligator clip lead by the addition of a Type 838-B Alligator Clip, as shown in Figure 4.

All Type 274 Plugs and Jacks have a contact resistance in the order of 1 milli-ohm. Plugs seat firmly in jacks so that the plug springs are not depended on for mechanical stability.

Patch cords with shielded plugs are also available, as listed below.

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