Hi all, That would be a 524B counter, all 90 tubes (depending on the plugin) and 600 watts of it. I still have one in going condition but it's not to be used in the Australian summer with 42C forecast for later this week.
The ovenised 100 KHz vacuum mounted crystal in it still performs pretty well for its age but of course is not in the same class as later instruments in my lab that are locked to a GPSDO. I first saw one as an EE student in the late 1960s when it was the ultimate in frequency measurement technology. The police used to bring their pneumatic tube electromechanical speed detectors into the university to have them calibrated against it. Cheers, Morris From: Neville Michie <[email protected]> Subject: Re: [time-nuts] HP Stories: Frequency Counter business decline, Modulation Domain Analyzers, geeks as models Hi, I used an HP counter in 1961 that had these vertical strings of neon tubes behind numbers, and the two least significant decimals were read off two milliamp meters numbered 0 to 10. For each count the needles would point to the number to be read. The whole instrument was a 2 foot cube that sat on a trolley. After all this time I can not remember the model number. Our company repaired Air force instruments and recalibration of frequency ?meters? (calibrated heterodyne oscillators). Cheers, Neville Michie ******************************* _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
