874 connectors were pretty much universally used on GR RF instruments manufactured after 1948.

The Type 774 connectors were used on many GR instruments from its introduction in 1941 until it was supplanted by the Type 874. The 774 was a constant impedance connector which was used for the genera

I agree - I have been collecting and using GR instruments for more than 40 years, and collecting and using HP instruments almost as long. The only Tek instruments that I own are my 453 'scope (second

Because I own a number of GR instruments that use 874 output connectors I have many 874 cables as well as many GR between-series adapters to adapt 874 to BNC, N, PL-259/SO-239, and a few others.

Dennis is correct. The oldest GR instrument in use on my bench is a Type1231-B Amplifier and Null Detector and its accessory Type 1231-P2 Tuned Circuit, both ca. 1950 (my 1231-B is the early design).

I would pretty much have to look at the actual connector to tell whether that is a trick of lighting or signs of damage. There are no "bendies" on the leaves of a GR-874 inner conductor, just on the o

I have never bought one new and have never seen disassembly or maintenance instructions (installation instructions are easy to find online). For about forty years I have worked with turns counters tha

Are those available online?

Datasheets probably won't help much as all three had internal scales and were almost certainly custom-made for Tek. All have P31 phosphors. If you need to find a different -nn variant that might work

The rule of thumb when isolation is required is "Don't isolate the instrument - isolate the DUT." Plug the Motorola supply into an isolation transformer - a true isolation transformer like my RCA WP-2

What went wrong is that images are using up too much storage. Is anyone here willing to pony up $6,000.00 per year to pay for the next level of storage?

I do the same. My Pentax DSLR, in RAW format, takes 6000x4000 pixel images that run about 29mb, depending upon what metadata is stored in an image. An 800x600 pixel JPEG reduction is usually sufficien

Where is it? I'm interested in having a parts machine. My 453 has been a stalwart for the 25 years that I've owned it, and it is still my shop 'scope.

You can look at NTSC video (old analog video) with it. It is pretty much useless for anything else as it is a specialized instrument. It was the waveform monitor of choice back in the day when I was a

Sulphur hexafluoride would be still better. It has a much higher breakdown voltage than nitrogen, and is non-flammable, so it can be used when pressurizing gas-filled cables carrying high voltages. My

Through the tube era and the discrete solid state era professional balanced audio lines in radio and recording studios were also impedance matched at 600 ohms (earlier 500 ohms) because they were tran

Same here but mine is close to 20 years. I have the client on both the desktop and the laptop and synchronize them, so I have those emails, and access to download new emails, whenever and wherever I a

For some people webmail is not a viable option because of the number of accounts that they have to handle from several email servers. If I had to do webmail for all of my accounts and servers that wou

Colin - My worst typos come when I try to write a reply in the morning before I finish my second cup of coffee. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA https://plymouthcolony.net/star

I think you meant 453, not 435. The 453 was developed by Tek specifically for IBM field service. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA https://plymouthcolony.net/starcity/radios/ind