Shaun Merrigan's Information Pages


Category: Electronics


New Vacuum Tube Box Scans

Posted by Shaun Merrigan in Electronics, Vacuum Tubes. Comments Off on New Vacuum Tube Box Scans

6th January

New Vacuum  Tube Box Scans

I have uploaded several new vacuum tube box scans including Philco, Canadian General Electric, Wards, and Hitachi (Hit-Ray):

 

 

Thanks,

 

Shaun M.


Tektronix 556 Dual Beam Oscilloscope Images

Posted by Shaun Merrigan in Electronics, Oscilloscopes, Tektronix 556, Vacuum Tubes. Comments Off on Tektronix 556 Dual Beam Oscilloscope Images

31st December

Tektronix 556 Dual Beam Oscilloscope Images

What follows is a series of images of my Tektronix 556 Dual Beam Oscilloscope displaying various waveforms.  I am learning about this scope and how to use it.

A brief description of the unit can be found here: Tektronix 556

 

Thanks for reading.

 

Shaun M.



Tektronix 556 Dual Beam Oscilloscope

Posted by Shaun Merrigan in Electronics, Oscilloscopes, Tektronix 556. Comments Off on Tektronix 556 Dual Beam Oscilloscope

5th December

Tektronix 556 Dual Beam Oscilloscope

I had recently the unique opportunity to acquire a complete Tektronix 556 Oscilloscope setup.  This comprised the oscilloscope itself, the matching scope cart, original manual, probes and 12 plug-in units.  This in itself is rare enough, but in addition, this particular scope has the optically desirable blue phosphor CRT and Tektronix C-27 Camera Bezel.   This 50 MHz bandwidth oscilloscope was the state of the art when it was introduced in the mid 1960’s: Tekwiki Tek 556

This will be the first of many posts and updates as I work my way through checking and restoring this beautiful scope.

And now some images:

Thanks!

 

Shaun Merrigan

 

 


Tektronix Oscilloscopes 7904, 2467B, 2465B at 1GHz

Posted by Shaun Merrigan in Electronics, Oscilloscopes. Comments Off on Tektronix Oscilloscopes 7904, 2467B, 2465B at 1GHz

30th October

Tektronix Oscilloscopes 7904, 2467B, 2465B at 1GHz

The images to follow show a 1 GHz sine wave (amplitude not changed during the testing) on the following Tektronix oscilloscopes:

Tektronix 7904 with 7A24 vertical (400 MHz) and 7B92A horizontal

Tektronix 2467B (400 MHz scope)

Tektronix 2465B (400 MHz scope)

 

 

 

 

 

I have checked the bandwidth of the both the 2465B and 2467B used here, and they meet the 400MHz requirement at -3db (using a Tektronix SG504 with leveling head).  The bandwidth of the 7904 mainframe + 7A24 vertical plug-in used in this test is about 450 MHz (-3db), but it remains at almost that level out to > 600 MHz.  At 1 GHz I can still easily get 175 mV of signal on the screen of the 7904 + 7A24 where the two newer scopes can only manage  25 mV or less.

Shaun Merrigan


Tektronix 7904 Oscilloscope

Posted by Shaun Merrigan in Electronics, Oscilloscopes. Comments Off on Tektronix 7904 Oscilloscope

30th October

Tektronix 7904 Oscilloscope

Here are some images of one 7904 mainframe  with a 7A24 vertical module and a 7B92A horizontal module.  The scope screen shows the pulse from an S52 pulse head; the rise time is about 850ps which translates into a bandwidth of about 412 MHz.  Since the 7A24 plug-in is specified at 400 MHz, this is about right.

 

 

This is the same pulse from an S52 pulse head but using an S4 sampling head instead of the 7A24 vertical amplifier

 

Shaun Merrigan


Tektronix 7000 Series Equipment

Posted by Shaun Merrigan in Electronics, Oscilloscopes, Time and Frequency. Comments Off on Tektronix 7000 Series Equipment

25th October

Tektronix 7000 Series Equipment

I am doing some testing on recently acquired Tektronix 7000 series equipment.  Involved in these images is a Tektronix 7904A mainframe using a 7S12 TDR/Sampler plug in with an S52 pulse generator and S4 sampling head.

The rise time on of the pulse is about 32ps which translates to a bandwidth of about 11 GHz; all this for a few hundred dollars.

Shaun Merrigan