Remember yesterday that I said there was a flaw with the original system? Well this flaw was human nature. For whilst the B.B.C. firmly believed that one person in the household would sit and tune in and then vacate the seat for someone else to listen to something else, that was a bit like sitting next to someone trying to do the Rubik`s Cube, you sat there so desperate to have a go that you felt like snatching it away from them, however kind and gentle you were.
The temporary solution to this was to share the earphones so each member of a couple could listen in, but within a short space of time some method of allowing other members of the family to hear the same as you at the same time became an urgent need.
The answer was that you needed to buy something else to fit to the original machine to amplify the sound, (and that is where it all started with the electronics upgrade market!). And for those who didnt want to buy, along came this set to show you how to build your own valve amplifier.
You can see the fronts of all the cards, with an explanation, at The Valve Museum website - and its great fun. However if you look at our card you will notice that the cards are numbered following on from the set we featured yesterday, starting at card 26 and closing at card 50.
By the way if anyone does build one, or remembers building one, please do let us know.