Hello! I've just bought an old fender rhodes 73 suitcase silvertop with an effect loop built-in and I have a lot of question to ask. 1. The keyboard action is quite "loose". I have to hit some keys very hard to get a sound. There's a big groove on each felt hammer and damper. What can I do about it? 2a. One of the speaker is blown. Is it possible to use the preamp without using the speakers? 2b. The preamp is powered by the suitcase. Is there another way to power up the preamp? 3. I'd like to change the original Jensen speakers. Wich speakers would do the job? Thanks for your help.