Tektronix 455

My second scope was the wonderful Tektronix 455 – a great analog scope with lots of great features – about 100 times better than my first Soviet C112 scope. Reasons:

Bandwidth50 MHz10 MHz
Number of channels21
Z - modulation (beam intensity channel)YesNo
Screen sizeBigVery small
Trigger modes/sources/combinations of themA lotThe basic ones
XY modeYesNo
Multimeter(Voltage, ohms)NoYes
A truckload of other cool featuresYesNo

I had to sell it to buy my current digital scope, but I remember it well 🙂 Good times…

If you need the manual, I have it in PDF form, just ask me for it.
Here are some photos – while looking for any pics, I couldn’t find any. So, here are some pictures of the scopes innards:

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Some nasty ASIC is under the heatsink…

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A part is missing! They stole my parts!!!

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Nice wavy routing 🙂

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Note the mechanical connections to various control elements.


Note the funny delay line above.

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This entry was posted in Measurement tech, Miscellany, Vintage tech and tagged . Bookmark the permalink.

12 Responses to Tektronix 455

  1. Paul C Johnson says:

    Hi Dave
    I ran into your site looking for some information about my Tek tas 455.
    My brother gave it to me.
    I read above that my machine has x y function. Could you point me to a site of how to implement X Y mode. Thank You Paul

    • daqq says:

      Hi Paul,

      Your machine does indeed have an XY function. To use it, IIRC you must set the time base to XY – then the timebase is turned off and X is sourced from one of the channels. More detailed tutorials are available on youtube.


  2. Keith Schreiter says:

    you said you have the manual on the 455 scope, Well I could use one. Let me know if you send a pdf on it

    Thanks Keith N9QDS

  3. daqq says:

    Sorry, I no longer have those files.

  4. John says:

    Hello Paul,
    I needed a scope to work in an environment where very low radio frequency noise was important. This requires a linear power supply and (usually) some additional shielding.
    Digital devices, cell phone, laptop etc. were all problems. So, back to stone age… Simpson 269 and Tek 455. Your site was a big help in the decision process, and the manuals were very useful too. Purchased a parts only from ebay, and have managed to fix nearly all the bugs. Wish me luck.
    Thanks for keeping your site up. /John

  5. Tom Huckaby says:

    Thank you for this site. I need an on/off switch for a Textronix 455 I have on order. I also would like to get an operator’s manual. Can you help me with obtaining either or both of these items or could you point me in the direction I should go to find them? Thank you,….Tom

  6. RC says:

    If you seek 455 info I have a complete manual set. Let me know what you need and I’ll scan some pages. fincemgr at yahoo dot com. What a fantastic example of premium commercial grade test equipment available at that time.


  7. Tont says:

    I just purchased a 455 yesterday with no manual it’s my first scope if you could pass along the part work it would be very much appreciated

  8. Wayne says:


    I have a 455 scope and could really use the manual. Could you please email me the PDF manual.



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