Good job so far! I'm interested to hear some recordings of your audio...you can upload to mega.nz.
I have a different type of pre-amp in my possession (after waiting a long time for shipping from China), but haven't had much time to get all the tools out to solder something together.
For those that are interested in clocks. Here is a month duration Longcase clock. In case you have never seen one. Looking at the movement you can see how much bigger some of the wheels are in order for the gearing to be able to last a month on one single full wind. It’s a nice clock.
Good job Eland. Congratulations, you are doing a good job. And do not despair about the broken discs ... I have already lost count of how many I have destroyed, due to excessive heat, excessive force, etc.
It could be that my response is a bit hasty, but I'm sure you do not need any of the devices that you indicate in the links. they are all POWER AMPLIFIERS. And what you need is a pre-amplifier. And seeing what you used in your project, I would consider that what you need is accurate and nothing more. It is possible that some modifications could be made but they would be minor. I would like to ask you to share an on-screen capture of the waveform to determine the level of the signal you are getting. I send you an example of what I am requesting.
If I live to retire and will be in good health (you never know) my plan is to dedicate a lot of time to this wonderful hobby and perhaps even be able to make some extra money doing it. I really don't know if there's any money to be made by building quality watches and try to market them and sell them on eBay, but I'm going to give it a try. Perhaps branding is more important than I imagine, but I'll see. Also, I've been asked by several people to "have a look" at their old mechanical and automatic watches, but so far I've denied it, having too little time even for my own projects.