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Some units had a Li-SOCl2 non-rechargeable primary cell soldered to the main board to keep RAM powered, instead of the Dallas SRAMs. Is that what you’ve got?

Hi, Bob, it looks like it is a bit different in my 2432A. There is a big 1,6Ah 3,5v li batterij without Sram underneath. It stll measures 3.6v so I guess this one should be ok? I will concentrate on

This sounds like a handy device, and I particularly like the the reference and DUT inputs displayed on the screen at the same time. This is similar to the Huntron. However, I have to add to the other

Gordon, If a sub transformer is too much to deal with, use a 12V battery and a resistor of 10-12 ohms at 15W in series to drop the voltage from 12-13.5V. That will totally isolate any leakage. It is

Thanks Mark & Morris. I like the idea of replacing the 5642’s with silicon, so I’ll order the 2CL2FLs from Amazon. One less thing to go wrong. Strangely, Digikey doesn’t seem to carry them. It

Thanks Andy. Yes - I noticed on the schematic those parts have a box around them, so I assume my old beast doesn't have them. Good luck on your intensity control problem. Would love to hear of any

My first Science Fair project, in 1972 at age 12, was to convert a TV into a scope. I paid $2 to an ad in the back of Popular Electronics to get "plans" (it was just 4 mimeographed pages). The scheme

There's a popular open source project for creating oscilloscope music with images and 3D effects called osci-render https://github.com/jameshball/osci-render. With the MIDI control feature you could

Missed it AGAIN! ?

For a DIY alternative: https://www.qsl.net/kd7rem/pdf/octopus.pdf [email protected]> wrote:

Hi Gordon, Mark has a good point. There's leakage to ground somewhere in that divider chain. I have had experience of leakage both in a pot (focus) or in the CRT heater winding. You should check both.

<forehead slap> You can do that with any electrostatically-deflected jug, dag or no. I was recalling my failed attempts at trying the experiment with a TV crt. "Never mind." -- Emily Latella

That's a nice jug. The absence of dag means that you can recreate Thomson's "weighing the electron" experiment and double-check his measurements. ;) -- Cheers Tom

That brings back memories of the first scope I had as a kid, a1930s vintage RCA TMV-122-B, which I found at a garage sale for $5 sometime in the late 1970s. Thing weighed a ton, and I remember walking

In the late 1960s, there were a good number of 2 inch scopes from NRI, Conar, and others that could be had for "pump gas-cut grass-throw papers" money. The odd thing is that almost all of them were

Unloaded it looked fine really, but I missed the clue with the drop every 10ms. You live and learn. It's not the TO-3 power transistors in the back that get uncomfortably hot, but Q830 and Q850 (TO-39

Gordon, If you have a 6.3V transformer, use that to see if there is a leakage in the heater winding to the core of the power transformer. A leakage will load the high voltage down. Disconnect the

Hi Mark and Morris: Well, with all the crazy voltages around V814, I decided to pull it and establish the V800 screen voltage at +90V using a 27k resistor from pin 8 to ground. And...nothing blew up!

My demo board is coming in a few days. I'll see if it runs on WINE. John

Gordon, You measure the high voltage at the high voltage test point which is usually the cathode of the crt. A Simpson 630 meter has 5kV capacity. Morris O. is right. See if the 56,000 ohm 2W resistor