Hi Chris! I bought some refurb stuff from you a couple years ago to rebuild an old 555. I got the input board and the soft start power supply. I just wanted to circle back and tell you how it’s working out. I recently was able to get an Audio Precision System 2 analyzer in trade for some work. I have been learning how to use it and thought I’d run the 555 on it!

This is just a small sample – looking amazing:

The frequency response is very flat. And the THD+N is really low even at very low volume. THD is even across the frequency range. 

Nice stuff, Chris! You gave me a lot of help and it’s sort of kicked off a hobby for me. I’ve been fixing up old gear in my spare time and have had a lot of fun with it. 

Chris