Some oscilloscope pictures

Sylvia Else · 2021-08-23T02:30:08+00:00

Shows how the power transformer is directly wired to two separate boards. Not sure how, or why, they'd want to do that.Shows the hole through which the transistor has to be soldered. Note the two resistors in plastic tubing that have one end soldered to this board, and the other end soldered to a board at the back of the tube. Also a wire directly soldered to the board that also goes there.Shows the formed leads for the transistors. Fortunately, I now have a 3D printer and have been able to make a template for bending the leads. Not sure whether the white stand-offs have any useful thermal properties. They have to withstand about 170 volts.Another oddity is the two leads covered in yellow insulation. They are only connected at one end, and are marked on the schematic as "wired capacitors" across the resistors that lead to the tube X axis plates. No doubt they do produce some capacitance, but I can't imagine it's much. Anyone know what the purpose would be?Sylvia.

Aug 23, 2021 Last reply: 4 years ago 25 Replies

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Tom Gardner 4 years ago

No! It is a low-end Telequipment DM63 with 2 vertical plug-in slots. I am still surprised that a "budget" brand would have a dual beam storage tube.

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When digitising scopes became available, everybody heaved a sigh of relief, tempered only by realising the slow sampling rate.

The DM63 is 15MHz, but the writing speed isn't up to that.

The Tek tubes are works of art. I have a wall-mounted gharial head fashioned as a small shelf. I've mirrored the gharial's head shape with a Tek CRT that has had the ugly ceramic bit chopped off.

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Jan Panteltje 4 years ago

On a sunny day (Mon, 23 Aug 2021 15:33:47 -0700 (PDT)) it happened Phil Allison snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

And I wonder if J.Larkin could repair his digital scopes 40 years from now, especially after WW3 EPMs.

No parts, no chips, no displays (at least not with a compatible driver).

My CRT will work, if need be in emergency drive the deflection plates directly. Can do analog TV too:

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Phil Allison 4 years ago

Jan Panteltje wrote: =================

** Was that EMPs ? Take out most semis I believe.

JL's collection of Chinese DSOs are for use by his paid staff - a tiny cost compared to their wages. They get to like it or lump it.

** Did that with my home brew 3", 5 tube scope when I was 18.

Hooked up the H, V & Z inputs to suitable spots inside a 17" B&W tube TV set. Got a quite watchable pic of a Kim Novak movie - all in green.

Lucky I did not get a serious shock in the process.

..... Phil

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Jan Panteltje 4 years ago

On a sunny day (Mon, 23 Aug 2021 23:50:51 -0700 (PDT)) it happened Phil Allison snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

Yep.

Ha, my first scope was an old round TV CRT, high voltage came from a car ignition coil driven by a 4W audio amp that had feedback so it oscillated, rectified by some TV tube on a 1.5V battery, And the signals on the deflection coil sitting on my bed (no space) in jail^H^H^H^H cell.. well close.. :-) Where there is a will there is a way my father used to say.

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Phil Allison 4 years ago

Jan Panteltje wrote: ================ >

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** Wow !!! Maybe a 1S2 HT rectifier ?

** Yep - bedroom shenanigans out of sight from parents.....

** Or a Lawyer.

...... Phil

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Jan Panteltje 4 years ago

On a sunny day (Tue, 24 Aug 2021 02:43:39 -0700 (PDT)) it happened Phil Allison snipped-for-privacy@gmail.com wrote in snipped-for-privacy@googlegroups.com:

I think it was a DY86:

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Yes, crystal radio under my pillow, listen to radio plays when I should be sleeping...

He was in the resistance in WW2, before that fought Franco in Spain with the commies. After WW2 he was journalist, had a nice medium+short wave radio to hear what was going on in the world, that radio made me curious about how it worked..

Holly Shiit, they are doing F35 low altitude test here, noisy piece of s*it it is, wonder if one will crash into the water tower just a few hundred meters from here ...

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