>>283846Notice the symmetry. It is from an amplifier circuit.
When you have a push-pull type amplifier, you can have 2, 4, 6...or more tubes! That one has 4. Symmetry is important so that all 4 tubes have the same "match". The impedance and inductance of the circuit must be exactly the same.
If the impedance or inductance is not the same, efficiency will be reduced. Damage to the tubes may result.