Early ones were dodgy in the output transistor area and there was I believe (hopefully Mick will know more) a factory recall to fit more robust output devices and whilst there change a few parts associated with bias regulation.
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My one hums a bit if i put my hand near the top. Shielding not up to task i guess
Welcome to AoS
It's a long time ago but my recollection is that the did start independently of Ferrograph and headhunted a number of our design engineers. I cannot ever remember talk of a cassette drive at the Ferrograph South Shield factory. I moved down the road to Comet as a bench engineer and lost touch.
welcome mick great to have you on board !
absolutely ...its coming up quick !!