musix2000
Member
Hello ...
Since years diy-members use 400k resistors for the C12 pattern switch. I think because of misunderstanding the original schematics they used. In a C12-schematics from 1959, beside the resistors ladder, is written by hand: 0,4Mo, lin. (0,5Mo/WID.) This means that the common resistance of the 8 resistors is 400k. (lin. = linear, WID. = german: Widerstand = resistor). 0,5M for each of the 8 resistors makes no sense, this is a fault they made in this schematics. They forgot a "0". 0,05M (50K) is the right value to get linear steps and 50k resistors you find on the original C12 pattern switch .
I attached a copy of a schematics from 1960 without this fault. I have another schematics from 1957 which also shows 50k resistors, with an additionel picture of the inside of the pattern switch.
Kind regards .....
Since years diy-members use 400k resistors for the C12 pattern switch. I think because of misunderstanding the original schematics they used. In a C12-schematics from 1959, beside the resistors ladder, is written by hand: 0,4Mo, lin. (0,5Mo/WID.) This means that the common resistance of the 8 resistors is 400k. (lin. = linear, WID. = german: Widerstand = resistor). 0,5M for each of the 8 resistors makes no sense, this is a fault they made in this schematics. They forgot a "0". 0,05M (50K) is the right value to get linear steps and 50k resistors you find on the original C12 pattern switch .
I attached a copy of a schematics from 1960 without this fault. I have another schematics from 1957 which also shows 50k resistors, with an additionel picture of the inside of the pattern switch.
Kind regards .....