"The Tektronix 545B Oscilloscope is a laboratory instrument designed to operate with all Tektronix letter-series or 1-series plug-in units. It features two separate time-base generators which may be used to provide delayed sweep operation. This feature permits very accurate time measurements and detailed observation of a waveform." (Tektronix, Manual 545B, 1964)

BRIEF SPECS

The 545 series incorporate the industry standard lab scope for nearly three decades. While the predecessors 545 and 545A were exclusive tube, the 545B has some transistor circuitry and replaced the famous signal delay via distributed amplifier with a coax cable for viewing the leading edge of the signal. Triggering was increased to full bandwith and the crt had 1/3 more vertical deflection. The 545 series is very common even in Germany as the german army bought hundreds of instruments which appear frequently on the used instruments market. This particular scope was built in 1966 by Tektronix Heerenveen (NL). Below you see a bunch of plug-ins (D, O, K, CA, 1A1) fitting to all 530/540/550 series scopes:

I did hesitate to buy this scope 'as-is' from a surplus dealer as dust prevented a closer look. At home I was able to get a display. After washing is was clear that the scope was in very good condition, so I decided to do a full restauration. So mechanical near perfect I just had to find three minor electrical faults before it worked properly.