First of all, unless your idea is something so good, no person will back you and finance your project. You would have to build a prototype and show that it is better than other manufacturer products. It is difficult to build a prototype and bring something to market. How do you plan to sell it? Direct or through dealers? If you don't have the skill to build it, then you are subject to another set of issues and concerns. Once built, getting reviews is another issue. The process to bring something to market is very time consuming and expensive.
If you really think your idea is still worth it, I can probably help you build a prototype. We are a manufacturer or tube audio products. My partner has a Masters in electronics and designs applications for corporations. Contact me if you wish to discuss and need some direction.