I have a remarkably ancient Electric keyboard that I bought for £8 (a GEM electric organ that was probably on sale in Faraday's time) and which I use occasionally for working odd things out. (And sometimes just to make terrible noises with an atrocious brass sound over a very synthetic bossa nova drums rhythm just to torture myself and the neighbours).

But it is curiously tuned which is a little annoying. The A is not 440Hz but 433Hz (might be 432Hz) which is an odd choice as I can't believe that it is an organ that was targeted towards early music lovers.

I know it begs the question of why not set fire to it or give it to a worthy cause...

But is there a way to change it so that I can use other things that I have that are in 'normal' tuning.

I was hoping that there might be a switch or something inside that I could easily fiddle wth to up it to 440z? It seems odd that it would be gradually getting flatter over time.

It is ALL the keys. The thing is in tune with itself (relatively) so it suggested to me that there might be an overall tone generator that might be 'tweakable'.

I thought I would ask before I take it to bits an electrocute myself experimenting.