I believe you need a cap to block DC at either the ouput of the preamp, or the input of the amp. You don't need both, so it may be safe to remove one or the other as long as you keep this in mind when changing to other components. I'm no tech, just a tinkerer, so please, someone correct me if I am wrong. This cap will change the sound, but I suppose it's possible to prefer it with, rather than without. I removed them from my vintage amps and it did improve the sound. I now have to be careful though that any pre I use will have output caps.
