If there was no purge the Russian armed forces might be in better shape and considering that the new Russian tanks were far in advance of the German ones (T-34 and KV-1 naturally) can you imagine what would happen if the Soviets managed to also start producing the planned KV-3 with its either 85mm gun or the fearsome 107mm gun.
KV-3 Specifications
Designation: Tyazhyeliy Tank KV-3
Crew: 5 (cdr, gnr, ldr, dvr, co-dvr)
Weight: 149,914lb/68,000kg
Length: 30’4”/9.25m
Height: 10’2”/3.10m
Width: 11’2”/3.41m
Armament: 1x 107mm ZIS-6 gun, 2x 7.62mm DT machine-guns.
Ammunition Stowage: 44x 107mm, 2772 x 7.62mm.
Armour Thickness: Up to 130mm
Engine: V-2SN supercharged 12-cylinder diesel, 2368cu in/39 litre, 850hp.
Suspension: Transverse torsion bar
Maximum Speed: 19mph/30km/h
Road Radius: less than 124 miles/200km
Or the even bigger and better armoured KV-5 both of which were planned but due to war breaking out, never went into production.
KV-5 Specifications
Designation
Tyazhyeliy Tank KV-5
Crew 5 (cdr, gnr, ldr, dvr, MG gnr)
Weight
220,462lb/100,000kg
Length
36’5”/11.10m
Height
13’1”/4.00m
Width
12’11”/3.95m
Armament
1 x 107mm ZIS-6 gun;
3 x 7.62mm DT MGs
Armour Thickness
Up to 170mm
Engine
2 x V-2 12-cylinder diesel;
2368cu in/39 litre, 600hp each
Suspension
Transverse torsion bar
Imagine Panzer IIIs and IV's coming up against them. The Germans were not prepared for the T-34 and the KV-1 how would the do against a better armoured, better gunned KV.