The mod 1 torpedoes were longer, slower and heavier than mod 0, but offered better target acquisition capabilities and higher ability to intercept agile submarines.
They used wire-guidance.

The efficiency of Mk37 torpedoes was high for targets with speed lower than 20 knots (37 km/h) and depth less than 1,000 ft (300 m).
As submarines with higher speeds and operating depths appeared, new torpedoes were developed.
Of them, NT37C, D, E, and F are based on the Mk37 design.

In 1967, the mod 0s started being refurbished as mod 3, and mod 1 as mod 2.
These modifications involved many changes including replacement of magneto-constrictive transducers with piezoelectric ones, and resulted in target acquisition range increased from 700 yd (640 m) to 1,000 yd (910 m) without loss of sensitivity with increasing depth.

The torpedoes used Mark 46 silver-zinc batteries.
These had a known tendency to overheat, occasionally igniting or exploding.
Training torpedoes used reusable rechargeable secondary batteries.

For a long time, the Mark 37 was a primary U.S. submarine-launched ASW torpedo.
It was replaced by the Mark 48 starting in 1972.
The remaining inventory was then rebuilt and sold to several countries, including Israel, as the NT-37C after the vacuum tube guidance systems were replaced by solid-state electronics and the electric propulsion was replaced with a liquid monopropellant.
The mod 1 torpedoes were longer, slower and heavier than mod 0, but offered better target acquisition capabilities and higher ability to intercept agile submarines. They used wire-guidance.
The efficiency of Mk37 torpedoes was high for targets with speed lower than 20 knots (37 km/h) and depth less than 1,000 ft (300 m). As submarines with higher speeds and operating depths appeared, new torpedoes were developed. Of them, NT37C, D, E, and F are based on the Mk37 design.
In 1967, the mod 0s started being refurbished as mod 3, and mod 1 as mod 2. These modifications involved many changes including replacement of magneto-constrictive transducers with piezoelectric ones, and resulted in target acquisition range increased from 700 yd (640 m) to 1,000 yd (910 m) without loss of sensitivity with increasing depth.
The torpedoes used Mark 46 silver-zinc batteries. These had a known tendency to overheat, occasionally igniting or exploding. Training torpedoes used reusable rechargeable secondary batteries.
For a long time, the Mark 37 was a primary U.S. submarine-launched ASW torpedo. It was replaced by the Mark 48 starting in 1972. The remaining inventory was then rebuilt and sold to several countries, including Israel, as the NT-37C after the vacuum tube guidance systems were replaced by solid-state electronics and the electric propulsion was replaced with a liquid monopropellant.
Mark 37 torpedo