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Thanks for the interest. Our variations on the K9 are certainly different from the European ones. I've not seen pictures of the New Zealand made sets or possibly sets made in South Africa (if it was done there).
I've just compared the circuit of the K9 and K9A PSU and there are several differences. The main one is the use of a high frequency transformer to isolate the rectified mains from the secondaries. Very much like a computer power supply. The power authorities here were suspicious of non-earthed appliances, so all early Australian manufactured sets had earthed power supplies.
I'm not sure why we didn't adopt a modified pre-set tuner from the beginning. I guess cost was a major factor, the varactor tuner would have been expensive compared to the off the shelf locally made VHF rotary tuner.
In the next few days, I'll post some K11 pictures.
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