The 41MTA is a purpose designed high μ triode for use in television timebase circuits. This exhibit has a clear bulb of the earlier Cossor style, our other 41MTA is of later construction and the inside of the glass is coated.
The 41MTB was a triode for push-pull timebase circuits.
The box anode has a front to back dimension of 7mm.
The grid is wound on thick copper rods and while the anode is blackened the grid needs no cooling fins.
A closer view of the electrodes. The cathode tube is flat across the working face and the heater passes through the cathode four times.
The classic envelope is 44 mm in diameter, and excluding the B5 base pins is 95 mm tall.
Reference: 1043. Type 41MTA was first introduced in 1937.