How to change to the 12AT7 tube and what it will sound like. Here is the link to where you can buy the LED bulb. http://www.pinballlife.com/index.php?p=product&id=1174
Here are some other products from a dealer I trust and buy from online
https://imp.i114863.net/c/2224555/791999/11319
If you are looking for this tube here is one I like:
https://tubedepot.com/products/jj-ecc81-12at7-preamp-vacuum-tube.
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