He may say that JC was his first mentor, but I have found the truth.
On eBay is the amplifier on a cart true inspiration of Mr. Slagle. The text said it belongs to a 90 year old ham radio operator, so it clearly predates Dave's New York Noise work.
Stephens TruSonc - High Fidelity Audio Equipment - Here is another vintage Stephens TruSonic from my friend the Tube Hoarder. This is superb check it out. http://itishifi.blogspot.com