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On 4. Feb 2021, at 07:15, Ozan <ozan_g@...> wrote:

Hello,
I looked at the schematic briefly (I don't have this equipment). When it is stuck at 30V what voltages do you see at both terminals of diode D188 and D189, and node "AD"? The schematic has two different states, voltage mode and current mode. When output is stuck at 30V is the equipment in voltage or current mode?

Node "AD" is the output of differential amplifier, with such a mismatch between what feeds into node "AF" and what is at output (30V constant) Q150A should rail, which should rail node "AD". Railing of Q150A is collector voltage away from ~ 12V.


Ozan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
stevenhorii
Sent: Wednesday, February 03, 2021 8:46 AM
To: [email protected]
Subject: Re: [TekScopes] Slightly OT: OK Electronics tinyscope

Another tiny scope - an RF surveillance receiver made by F.G. Mason used a
small CRT as a spectrum display. The model with the tiny CRT is the Mini
Probe Receiver. Details are here in the Crypto Museum:

You are right; I am mistaken.? But Kay did make Kaypro.? The Electro Instruments company was from engineers who left Kay/NLS.? I would upload a pic of my EI voltmeter but the system won't allow attachments.
Those guys, Kay and Osborne as well as Sinclair were early entrepreneurs in electronics.
Bob
On Wednesday, February 3, 2021, 09:33:15 PM PST, Tom Lee <tomlee@...> wrote:
Are you sure ? I think you might be confusing Andy Kay (Kaypro) with
Osborne. They competed with each other. AFAIK, Andy Kay founded NLS, and
continued to run it through the Kaypro years.

--Tom

? NLS was the brainchild of Adam Osborne.? I still have an Electro Instruments 0.01% digital voltmeter and AC converter.? It uses telephone stepping relays and Nixie tubes.? I calibrated it and it appears to work great.
Bob
? ? ? On Wednesday, February 3, 2021, 08:56:43 PM PST, Ed Breya via groups.io <edbreya@...> wrote:
?
? Yup, I remember some NLS stuff. Many decades ago, I had an early mostly solid state model, maybe one of the first, with a state of the art digital display, using stacked planes of clear plastic with the numerals formed into them, and edge lit by bulbs such that only the selected number would show in each digit position, with a very 3-D effect, much more than with Nixies. It also had an electro-mechanical DAC, using telephone rotary stepping relays selecting precision resistors. It made a wonderful sound, clicking away as it arrived at the answer. Later, I had a couple of their 4-1/2 digit auto-ranging DMMs. They were my only and best DMMs for a long time, but eventually crapped out, and couldn't readily be fixed, since there was no info available. I think NLS is long gone, but for a while, they may have been at the forefront of the technology.

What I'm looking for now though, is something newer or current, like an OEM 5-1/2 digit DPM, if any exist, and at reasonable prices.

Ed

does anyone know where I can buy a pair of beam lead mixer diodes. i have a parrallel gap welder.

NLS was the brainchild of Adam Osborne.? I still have an Electro Instruments 0.01% digital voltmeter and AC converter.? It uses telephone stepping relays and Nixie tubes.? I calibrated it and it appears to work great.
Bob
On Wednesday, February 3, 2021, 08:56:43 PM PST, Ed Breya via groups.io <edbreya@...> wrote:
Yup, I remember some NLS stuff. Many decades ago, I had an early mostly solid state model, maybe one of the first, with a state of the art digital display, using stacked planes of clear plastic with the numerals formed into them, and edge lit by bulbs such that only the selected number would show in each digit position, with a very 3-D effect, much more than with Nixies. It also had an electro-mechanical DAC, using telephone rotary stepping relays selecting precision resistors. It made a wonderful sound, clicking away as it arrived at the answer. Later, I had a couple of their 4-1/2 digit auto-ranging DMMs. They were my only and best DMMs for a long time, but eventually crapped out, and couldn't readily be fixed, since there was no info available. I think NLS is long gone, but for a while, they may have been at the forefront of the technology.

What I'm looking for now though, is something newer or current, like an OEM 5-1/2 digit DPM, if any exist, and at reasonable prices.

Ed

Did any company use magnetostrictive delay lines in scopes or was the early
use for computer memory?

Steve Horii

On Wed, Feb 3, 2021, 08:30 cmjones01 <chris@...> wrote:

On Wed, Feb 3, 2021 at 12:33 AM John Williams <books4you4@...> wrote:

As far as I know coax was never used in any delay lines inside Tektronix

scopes.

The Tek 7912AD here on my desk uses a coax delay line. It really is
just two pieces of coax (one blue, one blue with a black stripe, if I
remember correctly) coiled up at one side of the instrument. I
understand that it's the limiting factor (apart from the vertical
amplifier plugin) on the system's bandwidth, which I've measured in
this case at about 700MHz.

Chris

Can the Digikey BOM be edited (items deleted) without causing problems for the next user? I only need about 1/3 of the parts, and don't want to introduce errors.
-Dave