quite a few people have used a speaker either connected directly to pin 4 of PL2A or through a control box. The thing is the audio output impedance of the 19 set is 100 ohms. Most speakers are around 3-8 ohms. This mismatch will result in low audio. You can use an audio matching transformer to match your speaker impedance. Connecting it to a 19 set snatch plug means you don't have to modify the set. It looks like you have a #3 control box so should have a spare drop. Canada actually had a need for a speaker and had a quote from Pye but never followed through.
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