[d smith]

Hi

No, the 42 audio output does not require a tube shield.

In the model 60, only the 6A7 det-osc tube, the 78 IF tube and the 75 2nd det tube used tube shields. And in later 1936 versions of the 60, the 6A7 did not use a shield.

The shields are very important, however, on the 78 and 75 tubes, The radio will squeal badly without them.

Hi Ron,
thanks for confirming this,
the reason I asked is because sometimes when the radio is playing there is an occassional popping noise, what might cause this?