[SwizzyMan]

If this model has a crystal cartridge the cartridge could very well be bad. Crystal cartridges were cheap and easy to manufacture but they often went bad. If it is bad that could be a reason for the low output/volume. If I am not mistaken if the cartridge is in fact bad you would have to use a modern cartridge as I don't think crystal cartridges are made anymore. I do think they can be sent off to be rebuilt. Or you could rebuild it yourself which I think isn't all that easy.