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Hi,
I have purchased a 1978, Italian Built Cosmo-sound CSE50 keyboard amplifier !
I bought it as a project as it was listed as 'not working'.
The cosmosound cse50 is an Italian built combo amplifier for keyboards but was apparently fairly popular for guitarists due to it having a rotating drum, based on the Leslie cabinets of the same and older era.
The initial repair to get it working involved replacing the original bridge rectifier (about 2 inches by 1 inch by 1/2 inch) a 'large' item with a slightly more modern one as any reference to the original has long gone.
Anyway the 2 pre-amp boards and the power-amp boards are pretty much straight forward and in need of a relatively minor service to bring them up to scratch.
However what I need is a diagram, if possible, for the footswitch - which was not present when purchased. It has a 3 pin socket and plug present labelled as 'control' to vary the speed of the drum. There are 2 motors to drive the drum, both 'geared' differently. The voltage at the control socket is pin 1 - 0 v pin 2 - 220 vac and pin 3 - 220 vac. pin 1 is common to both motors and 2 + 3 are motors 'a' and 'b'. Obviously when you select either 'channel' it should cancel the the other and a further press of a switch will stop the drum rotating altogether. I know it should be a relatively simple switching exercise but with 2/3 switches controlled by the foot carrying 220vac it is not one I am willing to gamble on.
I have considered removing the 220v from the switches and replacing with low voltage relays which would make the switching considerably safer.
I have purchased a 1978, Italian Built Cosmo-sound CSE50 keyboard amplifier !
I bought it as a project as it was listed as 'not working'.
The cosmosound cse50 is an Italian built combo amplifier for keyboards but was apparently fairly popular for guitarists due to it having a rotating drum, based on the Leslie cabinets of the same and older era.
The initial repair to get it working involved replacing the original bridge rectifier (about 2 inches by 1 inch by 1/2 inch) a 'large' item with a slightly more modern one as any reference to the original has long gone.
Anyway the 2 pre-amp boards and the power-amp boards are pretty much straight forward and in need of a relatively minor service to bring them up to scratch.
However what I need is a diagram, if possible, for the footswitch - which was not present when purchased. It has a 3 pin socket and plug present labelled as 'control' to vary the speed of the drum. There are 2 motors to drive the drum, both 'geared' differently. The voltage at the control socket is pin 1 - 0 v pin 2 - 220 vac and pin 3 - 220 vac. pin 1 is common to both motors and 2 + 3 are motors 'a' and 'b'. Obviously when you select either 'channel' it should cancel the the other and a further press of a switch will stop the drum rotating altogether. I know it should be a relatively simple switching exercise but with 2/3 switches controlled by the foot carrying 220vac it is not one I am willing to gamble on.
I have considered removing the 220v from the switches and replacing with low voltage relays which would make the switching considerably safer.
