I bought a Tektronix 4014 in 1991 and had it until 2016. During that time it never required any repairs or calibration. Built like a tank. The guy I sold it to

I bought a Tektronix 4014 in 1991 and had it until 2016. During that time it never required any repairs or calibration. Built like a tank. The guy I sold it to had to replace capacitors in the power supply, and still uses it today.