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Old 29th Mar 2012, 6:29 pm   #121
6AL5W-Martin
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Default Re: Oscilloscope Collection / Junky

5A22N: "this unit is junked, following to the order 9/93"

greetings
Martin
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Old 29th Mar 2012, 9:20 pm   #122
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Smile Re: Oscilloscope Collection / Junky

Swob III at work: displaying a 480kc LC with homebrew FET Interface.


greetings
Martin
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Old 1st Apr 2012, 6:58 am   #123
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Default Re: Oscilloscope Collection / Junky

hello friends,

our world is a small town, thanks to the internet !
The special dual fet from the input stage of my 5A22N (151-1027-) was found in the nederlands and is on the way. The friend who found it was searching for the screen frame + filter of a 7k, both parts are on the way to NL, it was in my spare parts collection. So 2 Tek become repaired.

greetings
Martin
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Old 7th Apr 2012, 7:16 am   #124
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Default Re: Oscilloscope Collection / Junky

happy eastern to all of you.

The next Tek comming on my table is a 564B, to repair / restore.
My first storage Oscilloscope.
greetings
Martin
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Old 7th Apr 2012, 10:11 am   #125
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Default Re: Oscilloscope Collection / Junky

Hi Martin, how stable is your SWOB III at 500KHz?

(and how do you get your green phosphor to show white...)
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Old 7th Apr 2012, 10:28 am   #126
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Default Re: Oscilloscope Collection / Junky

Hi Martin,

Happy Easter!

If you're about to get your first storage scope, I can pass on some advice I got a long time ago...

Always set the intensity with the storage system working and the persistence turned down to something short enough to be usable, NEVER with it set to 'Conventional'.

Good oscilloscope tubes are capable of high beam-current densities making very bright spots, so that they write a visible trace even when triggering and delayed timebases and 'holdoff' mean that the beam is off for a large proportion of time.

This means that the beam, when writing a slow-moving spot can be powerful enough to burn the phosphor on the screen. This is well known to ordinary scope users.

Storage tubes have the same beam current capabilities to allow them to write at very high speeds for non-repetitive signals. But they have some fragile mesh structures behind the screen. It is very easy to burn the storage mesh without even knowing you're doing it.

Run the scope with 'normal' storage settings, low persistence and a dim trace. Now gradually increase the intensity and the spot will get brighter, though the stored after-glow following it will not get any brighter. At some point the picture will start to bloom and light will spread outwards from the spot. You now have more beam current on that is good for the life-expectancy of your tube. You should reduce the intensity until the spot is not blooming, but just leave it for a moment. Switch the storage system to 'Conventional' and your picture changes to that of a normal scope with no persistence enhancement. The spot won't seem unusually bright.

What this means is that if you use a storage scope as a normal oscilloscope, you can't tell when you pass the point where you start to damage the tube. Storage scopes are best saved for when you really want storage for viewing slow events and one-shot events. If you do use a storage scope, try to avoid using its 'conventional' mode, and run it with some persistence enhancement working

This also applies to spectrum analysers with storage tubes.

Most storage scopes I come across have damaged tubes because few people know how to drive them. What you find is permanent bloomed areas left on the screen that pushing the erase button will not clear.

Sorry about the lecture, but it's something that any user needs to know, but it's not common knowledge.

Good luck. I hope your unit has a good, undamaged tube.

David
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Old 7th Apr 2012, 3:23 pm   #127
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Default Re: Oscilloscope Collection / Junky

Quote:
Originally Posted by PJL View Post
Hi Martin, how stable is your SWOB III at 500KHz?
(and how do you get your green phosphor to show white)
that swob is like an old tube boatanchor, warm him up for 20 minutes or more,
then it will not run away.

About the phosphor: this is a P7.
P7 is light-blue, with green shadow, very slowly shut down.
There is some different graticule glasses, when you use the green plate it will not show the blue beam. Change it to the transparent, to see the same then me.

greetings
Martin
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Old 23rd Apr 2012, 5:40 am   #128
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Default Re: Oscilloscope Collection / Junky

yesterday I found a Tek 549 storage,
the CRT is allready.

a funny old Tek, warm and heavy.

greetings
Martin
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Old 11th May 2012, 6:11 am   #129
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Default Re: Oscilloscope Collection / Junky

561A, R561A, R647
all are dirty and to restore.

greetings
Martin
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Old 16th May 2012, 10:30 pm   #130
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Default Re: Oscilloscope Collection / Junky

Here's one from the British contingent.
Solartron CD1212, still going strong after 50 years.
Cheers, Rob.
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Old 17th May 2012, 12:54 am   #131
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Default Re: Oscilloscope Collection / Junky

hello Rob,

that is a greatful Scope, and I see a plugin slot.
You have also some plugins for the Scope?

greetings
Martin
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Old 17th May 2012, 7:24 am   #132
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Default Re: Oscilloscope Collection / Junky

Good morning from a new recruit (still finding my way around).

For your interest, I have the following:

1 x Tek 7613 (storage display) with 7L13 analyser plug-in (working but uncalibrated)
1 x Tek 7603 with 2 x 7A18 dual-channel / 1 x 7853A timebase
2 x HP 1700 (modified for broadcast transmission use)
1 x HP 1701 (dead in the water - acquired for spares only)

Pictures to follow a.s.a.p.

Kind regards

Guy

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Old 17th May 2012, 10:31 am   #133
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Default Re: Oscilloscope Collection / Junky

Hi Martin, I only have the CX1252 plug-in that came with it, very similar to the Tektronix type CA.
Rob.
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Old 19th May 2012, 9:01 am   #134
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Default Re: Oscilloscope Collection / Junky

Got the 'Tron working without too much effort, now got a healthy 12kV at the final anode.
The triggering was initially a bit jumpy, but has settled down now.
Pic shows rise-time of calibrator output, 20Vpk-pk, 0.2us/cm sweep.
Rob.
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Old 19th May 2012, 9:56 am   #135
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Default Re: Oscilloscope Collection / Junky

a healthy 535A, with cart.
buyed for 50

my collection of old glowing Tek Scopes is growing.

greetings
Martin
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Old 19th May 2012, 10:10 am   #136
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Default Re: Oscilloscope Collection / Junky

Nice pic Martin. Maybe it's time for a web-page (or site) to show off your collection and restoration work?
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Old 19th May 2012, 10:57 pm   #137
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Default Re: Oscilloscope Collection / Junky

later ...

I`m collecting the Dual Beam series from Tek. (other scopes get also the home)
Today I am happy, the Tek 565 is buyed. (beside a 585A..)
So I need only 5k to be complete, Tek 5112 and 5113, 5444 (rare)

greetings
Martin

Last edited by 6AL5W-Martin; 19th May 2012 at 11:06 pm.
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Old 20th May 2012, 6:33 pm   #138
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Default Re: Oscilloscope Collection / Junky

Quote:
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Maybe it's time for a web-page (or site) to show off your collection and restoration work?
Definitely do this, Martin
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Old 20th May 2012, 7:33 pm   #139
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ok I will do that.

Last month I was on a meeting of radio collectors forum, and made there with a friend a little Tek show for the people.
There was more old scopes running then old radios on high power electric, 3x16A

keep smiling, here is one picture.

greetings
Martin
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Old 28th May 2012, 11:13 pm   #140
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hello friends,

the fine old 565.
Not so fast but fascinating, one of the both heavy Dual Beam Scopes in 19" size,
the other is the 556.

greetings
Martin
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