"To the Chief of the BTU, Military Engineer 1st Class comrade Korobkov
January 31st, 1941
I report the status of the work on the T-150 and T-220 tanks at the Kirov factory as of January 28th, 1941. The T-150 and T-220 tanks are still not ready for trials and have not been presented to the commission.
After replacing the engine that broke during factory breaking in on January 21st, 1941, the tank has still not been returned to a condition suitable for QA and Military Representative approval.
The gun mantlet design is unrefined and allows a gun depression of only 3 degrees as opposed to 6.5 degrees on blueprints.
The engine broke during factory breaking-in on January 25th, 1941. The experimental main bearings melted.
Presently, a new experimental engine is being installed on the tank. Chief Engineer of factory #75 comrade Chupakhin, currently at the Kirov factory, cannot vouch that the engines installed in T-150 and T-220 tanks will work.
Your decision is needed in equipping the T-150 and T-220 tanks with refined engines.
The T-150 and T-220 tanks were weighed on January 25th.
The combat weight of the T-150 is 50 tons 160 kg.
The combat weight of the T-220 is 62 tons 700 kg.
The GABTU's tactical-technical requirements give a limit of 48 tons for the T-150 and 56 tons for the T-220. I ask for your directions on whether or not it is sensible to put the T-150 and T-220 tanks through proving grounds trials if they do not meet the GABTU's requirements."