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Could this be for someone at tek to do maintenance on SM11 boxes?

On Fri, Jan 3, 2025 at 12:46?AM Clark Foley via groups.io
<clarkfoley@...> wrote:

They appear to related to Option 1M. I suspect someone needed to access the rear connections to the SM11 box and found it more convenient to patch them to the front. A simple unauthorized DIY mod to the panel probably saved many hours of opening the rack or crawling around the bench and fishing for cables.

They appear to related to Option 1M. I suspect someone needed to access the rear connections to the SM11 box and found it more convenient to patch them to the front. A simple unauthorized DIY mod to the panel probably saved many hours of opening the rack or crawling around the bench and fishing for cables.

That is truly bizarre!? Hard to imagine why somebody would need, or think he would need, that many connectors!
Jim FordLaguna Hills, California, USA

Like this:

The listing has ended. I would like to have seen the unit.

Hi Folks,

I just noticed this unit on ebay. The front panel has a whole extra
array of connectors there.


Does anyone know what these were for?

-Evan

Hi Guys!

I use to say that my books activity is 100% non-profit, but I was wrong.

When you are so kind to appreciate my work I get my salary!

Thanks and best wishes

(I will post soon a draft of the whole book)

The following photos have been uploaded to the JFETs substitution for 12au6s in 575 curve tracer ( /g/TekScopes/album?id=299769 ) photo album of the [email protected] group.

* IMG_1603.jpeg ( /g/TekScopes/photofromactivity?id=3872276 )
* IMG_1602.jpeg ( /g/TekScopes/photofromactivity?id=3872277 )
* IMG_1601.jpeg ( /g/TekScopes/photofromactivity?id=3872278 )
* IMG_1600.jpeg ( /g/TekScopes/photofromactivity?id=3872279 )
* IMG_1598.jpeg ( /g/TekScopes/photofromactivity?id=3872280 )
* IMG_1595.jpeg ( /g/TekScopes/photofromactivity?id=3872281 )
* IMG_1263.jpeg ( /g/TekScopes/photofromactivity?id=3872282 )
* IMG_1261.jpeg ( /g/TekScopes/photofromactivity?id=3872283 )
* IMG_1260.jpeg ( /g/TekScopes/photofromactivity?id=3872284 )

*By:* Anita Abranovic <anita.abranovic@...>

Got your message Richard. I just need to confirm the size with you and find a padded envelope to mail them in.

The crashing is due to some kind of instability when the +5 VL has no load. If I add enough constant load on that supply, the off condition doesn't cause any trouble. It's not something shorting out, but the opposite. I need to check some caps and R value changes in the supply and make sure all are up to date according to the mod history. If needed, I think I can fix it with some extra permanent loading.

The A-horizontal seems to work when the 7B53A plug-in is set just right mechanically - a contact problem I think. I can apply pressure to the bottom of the plug-in to make it fail. It's weird that when it goes bad, both axes are shrunken to about a quarter of normal. I'd think only the horizontal should be affected.

Ed

Probing the AE-35 unit in 2001 A space odyssey

Perhaps Tektronix P6006, Kubrick was a stickler for accuracy....



Jon

Re Probes, cable legnth....

The P600x had relatively thick cables, and massive screw on probe tips, hats.

Meant for tube sockets and B+ voltages.

Compensation was by rotating the probe body.

The later probe's starting with 454 scopes were much smaller, thinner cables slip on hats and had comp box adjust.


Finally the extra long cables traded off bandwidth for legnth, so always look for the standard legnths.

Remember to check probe compensation for each probe- scope- plugins combo.

Jon

Photo of my 536 in the photo library

/g/TekScopes/photo/299466/3866580?p=Created%2C%2C%2C20%2C2%2C0%2C0

Hi Jim. Yes the 536 should be very useful to you. However, the problem will be where to get one. It is arguably one of the rarest of Tek models. And no, you can’t have mine! lol. However you can use any other model to do the same thing. The 536 was designed to be much more precise for phase measurements. But that doesn’t stop you from using any model with a good horizontal amplifier either. I have been looking for certain 502 sheet metal parts on eBay, and I am surprised that there are so few 500 series on there. When I was in the business there were a lot of very reasonably priced examples. Not so any more.

Thanks, John Kolb.? I do have a 5103N-D10 (working properly) and a 5113 parts mule, with a total of twelve 5000 series plug-ins in various states of operation.? Also a 7904 (focus problem - to be solved maybe this month) with a total of nine 7000 series plug-ins, including a 7A22 that has a problem on 0.1, 0.2, and 0.5 V/div - almost certainly an attenuator with a bad connection.? The 5000 series plug-ins include two 5A22Ns, neither of which is working (yet).? My other scopes are a 7104 which needs a bit of TLC, and a (gulp) HP 54120B that needs a new power supply.

And yes, it is probably premature to talk about probes, John Williams, before I invest in a tube scope.? But it's looking like the 536 is the one to get, when the time comes.? Thanks, Jon (Jean-Paul), for pointing out this very intriguing model with the identical horizontal and vertical paths!? And the P600X probe series needs to go on the wishlist as well.? Hey, if that great audio gear at Marantz was designed with the 536, that's plenty to recommend it.
Thanks, John Griessen, for pointing out the 10 by 10 cm grid on the 536.? That's a great feature.
John Williams, I share your dislike for long probe cords!? I have a pile of P6102As and P6106As with the long cords, and they are constantly getting tangled.? I'll have to scour eBay for ones with the more reasonable lengths like 4 foot or 1 meter.? Space here in Southern California and the wife's patience with my hobby (obsession) being limited, everything I have in my garage lab is on one 5 foot wide bench and a 13 RU + 20 RU rack, so nothing is very far from anything else.? The long cords just get in the way.
And Joe, yes, I am familiar with probe compensation.? It's difficult to determine a person's background when he posts to the group.? In my case, I've been a professional EE for over 36 years, thank God only out of work for a few months since graduating with a BSEE in 1988.? But I know next to nothing about vacuum tubes, just that they sound great!
Not sure when I'll have time to jump into the deep end of vacuum tube audio and vacuum tube scopes, but now at least I know what tools to look for.? Thank you very much, everyone!
Jim

Greg,

I also take each knob off to oil the set screw and shafts. This makes it smoother to move and prevents freezing due to electrolysis. I will put a bit of oil on a flat blade screwdriver then put inside on shafts of the time/div. This is for ones where the metal shafts go deeper inside. I also oil the fans.

Mark

Mark,

Thanks for the reply. I also posted this on the TekScopes2 group and have many replies there. Here is a link to that thread:

/g/TekScopes2/message/17100

With all the suggestions I have my work cut out for me. It may take a while, but I will report the results.

Greg

Rebonjour

Probes, as mentioned the P600x series was used at the time.

The later probe's had wider BW but lower compensation C range.

A point of history...Stanley Kubrick's 2001: A Space Odyssey had a scene of astronauts David Bowman and Frank Poole, troubleshooting the AE -35 LNA, with a Tektronix P600x probe. No scopes though

Recommend 1980s Tektronix circuit concept books
Oscilloscope Probe Circuits and
Probe Measurements

536: a unique scope, used throughout the 1960s. So, at Marantz, Sid's , tube amp, preamplifier, tuners, 1,5,7C, 10B, were designed using 536. I was assisting Sid, later at Sequerra, I marveled at the simplicity of his technique.


Jon

“According to George Lydeck on this group, the Tek 535A is the best scope ever for tube audio work.”

Did I really say that?

I think what I meant to say is a good tube oscilloscope, like the 535A, is a good choice for dealing with the high voltages encountered in, let’s say, an audio tube amplifier since it is a little more bulletproof than a solid state scope. Although I have original probes for my 535A I tend to use more modern probes as they are less cumbersome.

Cheers and Happy New Year,

George KD6NEW

On 12/31/24 22:47, Jean-Paul via groups.io wrote:

Sid would display a lissajous of the input audio vs the output or distortion product of a distortion analyzer.

That's a fine looking 10 x 10 equal grid on the CRT face of the 536 on tekwiki.

I see how that would be the analog purist's favorite with 11 MHz bandwidth.
Much finer than a 602 monitor...and with number and letter plugins with the T timebase, (which I had never noticed before), it's better than a 504 503 or anything else without a 10 x 10 measuring grid on the CRT, (like the 535).