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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)

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

First, I see something very similar on my 475s here on the opposite coast. I do live just north of Washington DC with a clear view of "Broadcast Hill" in Tenleytown to the south, and (until they were

Hi! The ALT-Mode didn't work correctly on my first 7854. Initially it wasn't complicated to find the error - a diode installed the wrong way. But I couldn't beleave that this mistake wasn't found at

I have a TinySA on the way in the mail. That's exactly what I'm going to do! Dave

While rebuilding my 2235 Scope, I found one wire for the Variable Holdoff pot wasn't soldered, wire was in the hole in the lug, but someone forgot to poke it with the hot end of a soldering iron. I

Borrow a spectrum analyzer and you will see each station.

I guess I expected the different stations to be more distinct, but it is hard to nail down the exact frequency when looking closely. Is it the mix that's causing the consistent beat pattern? Not

Hi Jonathan, What is the sweep speed in the photo with the ringing? Knowing the ringing period is an important clue as to the cause. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford

Hi Dave, You gave the answer yourself: Sutro Tower, and "100MHz". That's FM broadcast. No point in turning off WiFi, etc. in search of something else. You already found it! --Cheers, Tom -- Prof.

Yes, it's very likely that the noise is from the Sutro tower. It has FM transmitters on it. I used to have an office a similar distance (about 2500ft according to Google Maps) from the Palace of

Looks like a local broadcast station.

Dennis, Yes it seems Coiltronics is no longer what it used to be. Perhaps Wayback Machine could get you back some 10 years ago? (did not try yet) Regards, Milan

Could use some help here: I've always had persistent high frequency noise on my scopes. So far I've been focused on lower frequency signals with reasonable signal strength. Between BW Limit turned on,

How is the probe tip grounded? Excess inductance can increase the amount of ringing, so use as short as possible ground. Mike wrote:

For the HV supply needed to power the Spectrum Tubes (long thin glass tubes filled with various gasses) I own I need a HV transformer that was relatively common 25 years ago but not I can't find any

The 500 series in the ultrasound article with the female technician just about has to be a later 545. It definitely has an early style 1A1 plug-in installed. It isn't a 547 because there are no rocker

Somehow, I have accumulated more of these than I need as I have acquired various accessory kits for my 519 in a quest to have one complete set of accessories for my 519. So, in the interest of helping

I binged watched Stargate SG-1 a few weeks ago, and I did see briefly see which I believe to be a RM503, in the intro for an episode in season 3. Beginning of the episode started in Major Carter's