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The Entwicklung series, more commonly known as the E-series, was a late-World War II attempt by Germany to produce a standardised series of tank designs. There were to be standard designs in six different weight classes, from which several specialised variants were to be developed. This intended to reverse the trend of extremely complex tank designs that had resulted in poor production rates and mechanical unreliability.

The E-75 Standardpanzer was intended to be the standard heavy tank to be used as a replacement of the Tiger II and Jagdtiger. The E-75 would have been built on the same production lines as the E-50 for ease of manufacture, and the two vehicles were to share many components, including the same Maybach HL 234 engine. The E-75 would have had much thicker armour however, and in fact compared to the Tiger II the E-75 had improved hull armour all round. As its name indicates, the resulting vehicle would have weighed in at over 75 tonnes, reducing its speed to around 40 km/h. To offset the increased weight, the bogies were spaced differently from on the E-50, with an extra pair added on each side, giving the E-75 a slightly improved track to ground contact length. According to some sources, the similarities between the E-50 and the E-75 went further; they were to be equipped with the same turret and 88mm L/71 or L/100 gun, along with an optical rangefinder for increased long range accuracy. German scientists and engineers had successfully designed a Schmalturm, narrow-front turret and infra-red lighting and sights for use on the prototypes of the Panther Ausf. F as the war drew to a close. Other sources however, indicate that the E-75 was to be fitted with the much larger Tiger II turret, which could be adapted to accommodate an even more powerful high velocity 10.5 cm gun.The original complex suspension by torsion bars was simplified with bogies. The standard Tiger II turret was equipped with 8.8cm KwK 44 L71 gun. The engine was an improved, fuel-injected Maybach HL234 which had 900 hp.