@jasonbourne71 Southwest Technical Products is certainly a blast from the past. I was 16 years old and upgraded from a Dynaco SC35 to a pair Mk III’s. I built a STP preamp kit that had push buttons. Did they have a connection Texas Instruments?
Is my Dynaco Stereo 400 worth repairing for resale?
After all the years, I’m sure it needs a good cleaning and at least all the cans replaced.
Will I even break even?
https://drive.google.com/file/d/10BBbN8Vd2_2sgQAoMI8N5CqnWdhASrbH/view?usp=drivesdk