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Thanks for the info. Checked 3 and 4 and the issue is not present. Looks like a U400. B

Forgot another very important thing: AFAIR, the issue is *not* present on Channels 3 and 4, if it's the Channel Select hybrid. Raymond

Forgot: AFAIK, the Channel Switch problem usually produces symmetrical vertical compression. Since your 'scope seems to suffer only "below the belt", there may be hope... The compression that is

There is a relatively frequent issue with the Channel Switch Hybrid (U400) in 2445's and 2465's. Replacement is the only option if it's the culprit. Sphere usually has it in stock but it isn't a cheap

I have no affiliation with the seller. http://losangeles.craigslist.org/sfv/ele/3331860582.html -Kurt

Pin 6 goes high when auto with no trigger is selected, so that appears to be fine. I've traced it as far as the sweep gate signal going to pin 3 of U380. From there it gets complicated because things

Free for pickup, General Radio "Unit" items: (Full of genuine Cycles instead of the new fangled Hertz) 1203-B Unit Power Supply 1208-B 65-500 MC Unit oscillator 1209-B 250-920 MC Unit oscillator

Oh, also. Use great caution around those pins and don't force anything. If you crack the glass, you will be out a tube. Tom

Maybe one of the vertical deflection plate leads has disconnected from the tube? On the vertical, there are four connections to the plates, two on the bottom and two on the top. Tom

Hi, I have 2465b. Horizontal measures ok. Vertical does the following; Above the center graticule it measures correctly. For example set for 1 volt per division a 2 volt sine wave correctly fills 2

Hi, I just acquired a 7B53A in good condition with option3 that has a good delayed sweep but no mains sweep. I do not have another working low sn 7B53A with trigger board pn670-1865-02. Cleaning the

Just a guess, could the Auto Timing cap C300 at pin 6 be leaking? Albert

I have recently acquired a 543 to add to my collection. From what I can see, it is similar to a 541A, with the addition of several more accurately calibrated horizontal magnifier positions. I was not

The X10 magnifier is on (TB variable knob pulled out) and the intensity turned up. The expanded trace is "reflecting" from the inside of the tube envelope. (Electron scattering.) All tubes do that to

I have a 7B92 (not the A version) plugin that has an odd problem. There's no trace in auto trigger mode unless it's triggered from a signal. Basically, auto behaves the same as normal. I've confirmed

Hey while your at it I need one for my kenwood kc6060 lab scope! Sent on the TELUS Mobility network with BlackBerry

Thanks Steve. I'd be very grateful! ;-) Mark

I may have one. I got 4 or 5 crt's from a friend who worked here 25 years ago. I was going to use one for a FM tuner display for my Sansui 9900. I believe they are still somewhere in my lab... Steve

This method, while close enough for HF work, is not anywhere near as close as a GPSDO. With the prices of Trimble Thunderbolts in the $100 range, you really should consider getting one. I have two

Why dont you drop Greg an email and ask him ...my personal experience is that he is usually decent to work with..(although at least one list memeber had a problem a few years back) Dave -- Dave