Off Topic about GRiD and 1958 Oscilloscope- Help requested.

Upon the date 03:24 PM 6/17/99 -0500, Greg Linder said something like: Hmmm, I've got no manual for this exact model but I could give you some rough guesses as to possible causes. I recommend that you search out a manual for this machine as it will give you the "road map" you will need to travel to the solution. Sorta sounds like a simple problem. Maybe one of the leads to a horizontal deflection plate is broken or that part of the horiz. driver has failed. I can help you with suggestions where to hunt for a manual if you like. Test probes could be a simple hunk of stiff wire if you're not at all concerned with looking at short pulses or high frequencies (above, say, 200 kHz or so) or low level circuits which could be overloaded by the typical 1 megohm input impedance of the 'scope or by high voltages. But I recommend you invest in a reasonable probe for your scope. You'll be happy with the results. $40-$50 for some lo-cost units I've seen advertised plus several $ for a BNC-to-PL259 adaptor. Virtually all probes sold today have BNC connectors. Contact me off-list about these issues if you like. The connector type on those earlier Tek scopes like yours is called SO-239. A PL-259 connector mounted on a coaxial cable plugs into it. Later on, I can't recall exactly when (mid-60's?), BNC type connectors came into use on most 'scopes. Lower losses at high frequencies, lower impedance and, therefore, less rounding of leading/trailing edges of waveforms with BNC conns. RG-58 and other RG-numbers are coaxial cable type designators. The RG-numbering system was created by the military over 50 years ago to standardize coax cable specs for consistent manufacture. Regards, Chris -- -- Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA cfandt(a)netsync.net Member of Antique Wireless Association Check our redesigned website! URL: http://www.antiquewireless.org/