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New oscilloscope board test Vid. http://www.youtube.com/watch?v=rLmddhZtDmI&feature=youtu.be

New oscilloscope board test Vid. http://www.youtube.com/watch?v=rLmddhZtDmI&feature=youtu.be

New oscilloscope board test Vid. http://www.youtube.com/watch?v=rLmddhZtDmI&feature=youtu.be

I only just recently acquired my first reciprocal and interpolating counter, a Racal-Dana 1992. Where can you find Thunderbolts for around $100? I suspect the big glut happened before I started

That is how I have done it. On modern receivers using CW instead of USB or LSB will produce a 600 or other tone. You could also just use USB or LSB and tune the receiver 600 Hz off frequency. wrote:

Make sure when buying a replacement that the manufacturer is "Tek" not "Maxtek". Later units (from around 1992) were produced in a new fab after Tek sold theirs. They are of inferior quality. Try and

I just recently picked up a Racal Dana 1992 to rebuild which included the TCXO option and faced a similar dilemma. The 1992 is the only frequency counter I have with an external reference input and

Another suggestion: Set the SOURCE switch to LINE triggering, and with the vertical sensitivity cranked up pretty high (i.e., like 100 mV) on the channel that your probe's connected to, touch the

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