Maybe... who knows... I highly doubt that. Mine as well. Everything is stock as can be. The only person sho has bee in there was only to take a few compositions out; maybe in a attempt to repair it. O

I seem to remember that blanking doesn't work the same way on the 335 as on other Teks. There is a deflection? plate that just repels the beam off to one side for blanking and in dim light with the in

For awhile now I have been taking photographs of my TV screen whenever I see a Tektronix ‘scope. One of these days I will put together a photo album and create a page on TekWiki and post them there.

When I worked at Curtis Mathes TV plant in Benton AR in late 1963 early 1964 they had a homemade screen room. 8 ft on all sides. Each section was 2x4 framework covered on both sides with 1/2 inch hard

Hello Dave I have been skipping over this thread, assuming that it concerned dealing with "ground bounce" on MSI logic chips on a buss. It’s a synchronous logic thing from the days of 54/74 TTL logic.

i noticed this last night. the show is about 3 yrs old so maybe it has already been posted. https://www.pbs.org/video/nova-wonders-whats-the-universe-made-of-2eyoyw/ 30:37 in Peter Fisher's lab at MIT

Dave, I visited Smith-Kettlewell Eye Research Institute in SF around 1974 for some collaborative work. Google maps shows them about 2.5 miles from the Sutro Tower that is your RF ground noise nemesis.

Thanks everyone for their inputs. Keep the stories coming. They're great! I was pretty punchy last night and probably wasn't saying what I was trying to very well. I think what was throwing me was the

Back in my early teens we lived on s slight hill and could see the State Police tower red lights on another hill 2-3 miles and could hear them on my homemade crystal radio and they were on 30 megacycl

Bonjour, sealed reed relays are VERY reliable and the telephone system had lifetimes for 40 years in constant use on 24.48V. But reeds can develop film on the contact surfaces, especially if unused fo

Just generally (perhaps not specifically for calibrating verticals) you can move to smaller but cheaper (if not as accurate, and as low a noise floor) like the TinySA, NanoVNA, et. al. They also gener

In my teens I live 10km from the CBK transmitter: 540KHz 50KW clear channel omnidirecional... I had an end fed antenna in the back yard of no more than 30m in length. I built a cheap Heathkit GR64 sho

Hi Eric, Just a thought here - you said: “I am having issues with 60, 20 and 6. With them also causing some havoc on auto range as well. When I have a situation where they are working the unit locks i

Pulled the tube last night and found a rice grain sized piece of glass and a smaller bit of metal rattling around inside. I assume ANY loose bits in a tube is a bad sign? Also, it looks like the tube

I was able to use an FM radio, probe, and Internet streaming to identify FM stations on noise. No need for a spectrum analyser... even though we have them.

Dave Tell your kids that the wifi will be off at a certain time and be off for xx minutes, they will not die, you are the boss. Leon Robinson K5JLR

Dave, As others have replied, no doubt FM broadcast from the Sutro Tower. Unreliable sources (Wikipaedia) indicate there are at least 4 FM broadcast stations 96.5 to 104.5 MHz transmitting from there.

You who replied to this are amazing! If you want to see more photographs of difficult-to-identify scopes (and very early ultrasound devices - including the famous one made from a B-29 ball turret) hav

There are no rocker switches on a 547.

Both versions (the one spotted by Siggi and the one currently listed) seem to be 1AD3001-0S for 16-22 V compared to 1AD3001-0A, version for 10-15 V; otherwise hard to spot a difference. TT