I have 3 Tek 2445 scopes and one Tek 2430A scope. While idly bumming around eBay, I noticed that it seemed to me the 2445s were less common and on average more expensive than the 2430As. Seeing as how

Dennis and all, Has everyone been overlooking the best source for tubes and related hardware? https://www.tubesandmore.com/products/tube_accessories Bill KB3DKS

The 150MHz 2445 came out concurrent with the 300MHz 2465, costing $3250 vs the 2465's $4750. Double the performance, and only a third more in price. More the wonder is why any sold at all? -Chuck

The Little Mountain part/Annex of Hill AFB has an interesting history. originally it was a specially built wind tunnel for testing the Ramjet engines for the Bomarc. After that program shut sown it

Voltages at Q114 & Q115 stay exactly the same when switching between ch1 & ch2. I have double checked voltages and there is a slight difference to what I'd previously reported: U130 Pin 13 1.97

The 2465B stores all of the offsets, and gain changes necessary to make the scope in calibration in the NVRAM that is on the A5 board. The only adjustment pots are in places where a resistor must be

Chris, The digitised output only appears on the XYZ connectors, I use a 485 in XY mode and found that the Z connection did not add anything useful. When I press the digital button. Tha analogue

TekScopes@...> wrote: amplifier wasn't working due to, you've guessed it, yet another short-circuit tantalum on the -15V rail which had taken out its 10R decoupling resistor. I replaced

Chris, The fastest sweep speeds need the x10 magnifier so you will have an apparently wide scan. On the 7B90P there is a 'mag' led that comes on. The graticule should show 10 x 8 equal squares so

Dennis and Aris are up here at sphere this weekend, he is bringing back the little meters, and the 570 meter, any other requests? we need to know in the next few hours. I also have clean working

Wow... That's cool!!!!... And the way he made for the shapes to "sing" as well! Awesome! <TekScopes@...> wrote: [Non-text portions of this message have been removed]

Hi David, [TekScopes] <TekScopes@...> wrote: Wouldn't a nylon spacer be plenty enough? Just some nylon struts, 1 inch to several inches in length, covered in corona dope? Welp... leakage

Gain control is through the vertical preamplifiers so it has to be done electronically. Maybe just the channel 2 vertical gain adjustment procedure can be done?

Yes, but ... That is the problem. Breakdown is also possible or even likely between the winding or leads and the steel transformer core so the core needs to be floated somehow as well. If leakage

Hello Stefan, Fantastic! I'd suspect the artist used pills and mushrooms to reconfigure his acoustic sensors and grey matter in X-Y mode, the result is worth the sacrifice though. You may have to

So the voltages at the bases of Q114 and Q115 are correct. Just to be sure, did you check them with and without channel 1 selected? They should not change. Measured: U130 Pin 13 1.7 Volts

The CH 2 vertical gain on my 2465b is a few percent off, relative to the CH 1 gain, which is right on. Is there an adjustment pot for this, or do I have to go through the whole calibration procedure

We've all seen oscilloscope art before, but I haven't seen nothing like this: <https://youtu.be/TOjld0ZcNzs?t=533> Thanks to Jong for digging that one up. Below are the youtube channels of the

Chris, If you have the manuals, look for the calibration of the read gun and you will find the instruction to reverse the connection to the focus coil. You should then get a bright ring on the video

Good news.  You are most welcome. Mac To: TekScopes@... Sent: Saturday, March 25, 2017 7:58 PM Subject: Re: [TekScopes] u800 again   Thank you Machine Guy, Your summary of the