Date   

Re: For sale in Spain, my TDS540B

satbeginner
 

Hi Albert,

Good that you noticed, it's probably because I hooked it up to this wonderful Windows 98 machine...
No battery backup in that machine, but it does have a SSD ;-)

I will check and update the pictures if necessary :-)

Leo Kroonenburg


TDS3000B series

 

Is there a proper service manual (e.g. CLIP) or similar for these.

David


Re: For sale in Spain, my TDS540B

Albert Otten
 

Hi Leo, I suppose the date 3 Apr 2036 is an expiration date ;-) ?
Albert


Wanted Tektronix 2756P / 2794

MARC CHRISTIAN
 

Has any Tektronix Member For Sale 2756P / 2794 Spectrum Analyser

Thank you Marc


Re: 7934 on eBay UK

Vintage Test
 

Do you mean physical size or current rating DaveD?

Cheers,
Mel

--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .


Re: Tektronix 2467B Auto Measure Faulty?

Leandro Lindemann
 

Thank you very much for the informations!

One question, out of pure curiosity:

What would have been the reason for Tektronix not to use the X1 - X10 key in its scope line, which, as far as I know, is more advanced at the time? I remember that I had a 2230, with the original probes, and there was the X1-X10 key.


Re: Tektronix 2467B Auto Measure Faulty?

Harvey White
 

The extra pin that contacts the ring is connected to a resistor that is grounded.  With no resistance, the plugin (except the current plugin) reads what you set on the attenuation dial.  With an 11K resistor (guessing, go find a scope probe manual)) it will correct the readout to x10.  There's a probe that allows you to set the attenuation factor readout (by switch) to match the resistive cores you insert as part of the attenuator (P6156?  it's a 50 ohm probe).

On the current probe plugin (I think it's a 7A14), the ring is used to determine which kind of probe you have (P6120 or P6122). Not relevant to your problem.

You can correct to at least x100, not sure about x1000.

What you can do is to find a dead probe with the compensation box.  It can be disassembled.  Remove the innards except for the probe ring and attach a straight BNC connector.  Plugging a 10x probe without a key pin into this allows the existing key pin to work.

Likely more work that it's worth (and I need to do that to a P6020/P6022 probe adaptor).

Harvey

On 2/28/2020 1:38 PM, Leandro Lindemann via Groups.Io wrote:
Your message woke me up for a test:

My test tips (p6137) do not have an X1 - X10 key. Is it possible, using these test tips, to have this option?



Re: AC Gnd DC input coupling switch on 466

Edward Prest
 

Yes, one loose, the other channel ready to let go. Both tightened.
It took 4.5 hours to pull the boards and put it all back.
Picture downloaded under my name.


For sale in Spain, my TDS540B

satbeginner
 

Hi all,

Although I love my TDS540B, I need the space for my other scopes, mostly 24xx, and my other projects.
The unit is with me in Spain and passes both the self test and all internal diagnostics and also the Signal Path Compensation.

Based on the size and weight I think shipping is only realistic on this side of the world...

Some pictures here, if needed I can post more.
https://groups.io/g/TekScopes/album?id=242034

If interested, please contact me off list.

Un saludo,

Leo


Re: 555 Attributes, facets, benefits and General Discussion

fiftythreebuick
 

Hi Bill-

You're right, there are similarities between the 555 and 556, and a good number of differences. For one, the original version of the 555 is all tubes while the 556 is hybrid. The bandwidth difference is 30 mc vs 50 mc. They use the same plug-in units.

One difference that I like in the 555's favor is the design of the high voltage supply. The 555 uses the older style of xfmr and the HV circuit is not sealed in a box. All of the ones that I have had and worked on have been quite reliable!

I also like the plug-in timebases. Put one on an extender card and there is very good service access.

The 21/22 timebases have a really handy auto-level trigger function that's really convenient as long as you're within the bandwidth that the circuit can handle, while the 21A/22A have a really good tunnel diode-based trigger circuit that will trigger on almost anything. Using a Type O Plug-In Unit in one beam as a trigger conditioner even gives you better ability to trigger on difficult signals, with the ability to keep an eye directly on the trigger signal on the extra beam that the O is installed in.

And as mention, it's an extremely pleasing to operate unit!

Tom

On Wed, Feb 26, 2020 at 06:44 AM, bill koski wrote:


I've never seen a 555 up close and personal but I have a 556 that I bought for
25 bucks with the full manual at a HAM/Antique radio fest. From what I know
it's very similar to the 555 but has it's own power supply built in.
Other than a vertical driver tube and maybe 1 or 2 other tubes I've been
running it as I bought it. It had a single and a dual trace plugin with it.
I've since acquired 5 or 6 plugins from a flea market for about 10 bucks each.
All had tubes and needed little more than cleanup. I then got a single bay
(535?) with another 4 complete plugins.
Checked out the plugins but not the scope itself yet.
Fortunately I got to all those plugins before any audiophiles did to strip the
tube out of them. ( I'm actually a tube audio nut myself but would never strip
a Tek unit for an audio project!!!)
I built a cart for the 556 and it sits next to my bench always ready for
action.
It too has quite an inrush when turned on. I have an old analog TV in my
office and before I did some rewiring I could watch the picture get narrower
and lights dim when I switch on the 556!
It used to be a "Hey watch this" moment when I had friends over:)
I love using it. Though it's only rated for 50 MHz I've easily locked on
100MHz+ signals (heavily attenuated.)
The internal construction of those scopes is a work of art to look at in my
opinion.
I've not done a calibration on anything yet but with the plugins I use most
form the basic checks I've done things seem to be pretty close to nut on. I'm
sure it's been decades since a calibration was done on anything and possibly
much not touched since it left the factory.

BTW while I'm here I do have a 1L5 spectrum analyzer plugin that I bought
(cost more than the 2 scopes and all the other plugins put together) I don't
believe it is working. I've checked the FET in it and did find 1 lytic that
was bad but it appears to still have some problems. I need to make an
extension cable to check it further and then that may become a discussion for
another time here other than to ask if there is any common things to look for
that goes bad on those?


Re: Tektronix 2467B Auto Measure Faulty?

Leandro Lindemann
 

Yes, satbeginne.

Thank You.


Re: Tektronix 2467B Auto Measure Faulty?

Chuck Harris
 

Hi Leo,

Not a detour, just a helpful hint.

Thanks!

-Chuck Harris

satbeginner wrote:

Hi Chuck,

Thanks for this great explanation, and sorry for the detour in this thread.

Another example of RTFM on my behalf...

Un saludo,

Leo




Re: Tektronix 2467B Auto Measure Faulty?

satbeginner
 

Yes, it is the original probe type sold with this scope.

Just to be sure, if you set a channel for eg. 50mV with readout on, and you attach the probe to that channel, you do see the sensitivity readout change from 50mV to 500mV?


Re: Tektronix 2467B Auto Measure Faulty?

Leandro Lindemann
 

Yes, it has the pin.

This test tip was the original one for this scope (2467B), right?


Re: Tektronix 2467B Auto Measure Faulty?

satbeginner
 

As far as I know the P6137 is a 10x only probe, not switchable between 1x or 10x.

It should have the spring loaded identifier pin next to the BNC connector to tell the scope to change the readout.

Leo


Re: Want to buy 547 scope HV transformer

David Berlind
 

Ok. So no where near me in Boston. I have two 547s. I haven't started to
dig into either. But the idea was to pick one as the primary and the other
as the parts horse, if I needed a parts horse. But, it's looking more and
more like I should not keep either. I need to thin the herd.

On Fri, Feb 28, 2020 at 1:55 PM Queen Nanu <@QueenNanu> wrote:

I am in Ghana




Sphere Stuff Day CRTs (yes, you can stay home an still get them)

 

Everybody is always looking for unobtainable Tek and HP CRTs, here’s
what we will be clearing out at Stuff Day., along with MANY generic types
which will be posted to the Remote Stuff Day Page. This is an advance look
for list members of the Tek and HP types. These take up a HUGE amount
of room, so I will be very happy to see them live at your place.

Tektronix CRTs any one for US$40 each, unless marked otherwise.
---------------------------------------------------------------------------------
(1) 119-4444-10 Sony CRT assy, NIB ($70)
(1) 154-0235-00 Circ.
(1) 154-0433-00 Circ., w/shield
(1) 154-0633-13 Rect., P7
(1) 154-0633-10 Rect.
(1) 154-0644-09 Rect. Screen dot
(2) 154-0667-02 Rect., w/shield
(1) 154-0672-00 Rect.
(1) 154-0713-04 Rect, Dual Beam
(1) 154-0726-05 Rect., NIB
(2) 154-0731-00 Rect.
(2) 154-0850-01 Rect.
(1) 154-0905-00 Rect.
(1) 154-0910-00 Rect., Spectrum Analyzer
(1) 154-0969-00 Rect. w/shield
(1) 5BGP2 Tek, Circ.
(1) 492 SA CRT w/shield ($70)
(1) SA CRT w/shield, probably 492 style. ($70)

HP CRTs any one for US$35 each, unless marked otherwise.
--------------------------------------------------------------------------
(1) 2510-0531 Rect. Mag. CRT assy (HP 8920) NIB ($95)
(1) 5083-0570 Rect. Storage
(1) 5083-1620 NIB
(1) 5083-2372 Rect. (HP180?)
(1) 5083-2511 Rect. Storage (HP 141T) SA NIB ($75)
(1) 5083-3853 Circ. (HP 1220A)
(1) 5083-3976 NIB (HP 182T) ($75)
(1) 5083-4052
(1) 5083-4652 Rect.

Also have new 5ADP1 circular tubes, used in some early scopes.

All will get posted to the Remote Stuff Day page for casual perusing shortly,
along with another 70 or so US/Euro and Japanese standard CRTs, some as cheap as US$5
each. All are clean, at least filament tested or known to work, some are factory new (NIB).
This means you can get them at any time until Stuff Day ends, whether you pick them up
or have them shipped, but first come, first served.

Please email me off list (walter2 -at- sphere.bc.ca) if any interest in these. You can get them now or reserve them for pick up at stuff day. Keep in mind, the cheapest shipping for a full sized CRT is about US$50 in North America, so pick up makes real sense, as it would pay for your gas up here.

All the best,
Walter
Sphere Research Corp.
https://www.sphere.bc.ca/test/index.html


Re: Want to buy 547 scope HV transformer

Queen Nanu <news@...>
 

I am in Ghana


Re: Tektronix 2467B Auto Measure Faulty?

Leandro Lindemann
 

Your message woke me up for a test:

My test tips (p6137) do not have an X1 - X10 key. Is it possible, using these test tips, to have this option?


Re: Tektronix 2467B Auto Measure Faulty?

satbeginner
 

Hi Chuck,

Thanks for this great explanation, and sorry for the detour in this thread.

Another example of RTFM on my behalf...

Un saludo,

Leo