Reli said:
OK but where were the chips and caps made?
OK, so let me have a quick look at what's in the 1964 Zenith Royal, a small but heavy thing with a solid leathern cabinet, that Birmabright chassis and some familiar looking yellow ceramic caps at a time when domestic UK stuff was using waxies..
Plessey electrolytic caps were made in Plessey, a village by Cramlington in Northumberland (UK). Thae yellow ceramic PIO caps are Mullard, made in Plymouth, right down there in the south west of England. Devon if my memory is correct on its political geography. Then a few high value PIOs are the distinctive black pitch ones as made by Philips, somewhere in the home counties by London.
No
"chips" in anything Zenith before around 1969 when a TAD100 served as mw/lw I/F & R/F amp and lw/mw local oscillator, but their
transistors were all Mullard ones, shipped somewhere to have their AF11* numbers scraped off (

) and replaced with "cold cathode" labels such as 0C71, which would have been supplied through GEC or EdiSwan to the overseas markets. Reason for Mullard changing to these labels was so that [Mullard] wouldn't be the ones taken to court in the states by NASA when tin whisker syndrome caused the AF11* equivalents to kill comms between ground control and the fellas in some mission involving the moon and some kind of spacecraft. You might find that it was soon after that episode that the USA started using its own transistors..
