SWTPC - Southwest Technical Products Corp - made some really sweet power amps back in the 70's. Late in the decade they switched to the new home computer hobby and then went out of business. The 215 was a small 25watt (min) RMS) amp / ch into 8ohms. The kit cost $79.50. IM distortion - less than .01% Damping factor over 100 Hum & Noise 85db
