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453 (view source)

Revision as of 09:45, 15 November 2021

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==Internals==
==Internals==
The 453 is almost entirely solid-state, even in its first version, except for the [[5642]] HV rectifiers and CRT.   
The 453 is almost entirely solid-state, even in its first version, except for the [[5642]] HV rectifiers and CRT.   
Early 453's (below serial number 20,000) used a few [[8393]] Nuvistor triode tubes.  The 453A, [[introduced in 1971]],  
Early 453's (below serial number 20,000) used six [[8393]] Nuvistor triode tubes (two of them paired).   
was fully transistorized, with extended bandwidth to 60 MHz, increased the graticule from 6 cm × 10 cm to 8 cm × 10 cm,
The 453A, [[introduced in 1971]], was fully transistorized, with extended bandwidth to 60 MHz, increased the graticule from 6 × 10 cm² to 8 × 10 cm², and introduced a mixed-sweep mode.   
and introduced a mixed-sweep mode.  Mixed-sweep mode starts the sweep at the "A" time/div rate and  
Mixed-sweep mode starts the sweep at the "A" time/div rate and then, after a delay set by a ten-turn vernier dial, continues at the "B" sweep time/div rate.
then, after a delay set by a ten-turn vernier dial, continues at the "B" sweep time/div rate.


There are two trigger/sweep units in a 453, thereby enabling delayed sweep mode.   
There are two trigger/sweep units in a 453, thereby enabling delayed sweep mode.   
There are two delayed sweep modes: "B runs after A" and "B triggerable after A".  
There are two delayed sweep modes: "B runs after A" and "B triggerable after A".  
The A and the B sweep triggering both use [[tunnel diodes]],  
The A and the B sweep triggering both use [[tunnel diodes]], with a trigger preamplifier preceding the actual trigger circuit.  
with a trigger preamplifier preceding the actual trigger circuit.  
The use of tunnel (Esaki) diodes gave the 453 triggering that is stable and useful to twice the oscilloscope's bandwidth.   
The use of tunnel (Esaki) diodes gave the 453 triggering that is stable and
useful to twice the oscilloscope's bandwidth.   


The vertical amplifier that drives the CRT ([[T4533]]) deflection plates  
The vertical amplifier that drives the CRT ([[T4533]]) deflection plates is a cascoded differential amplifier made of NPN transistors.
is a cascoded differential amplifier made of NPN transistors.
Each horizontal deflection plate is driven by a common-emitter amplifier with feedback.   
Each horizontal deflection plate is driven by a common-emitter amplifier with feedback.   


The total CRT acceleration is 10 kV.
The 453 uses the [[Media:Tek 120-0360-00.pdf|120-0360-00]] HV transformer.
The 453 uses the [[Media:Tek 120-0360-00.pdf|120-0360-00]] HV transformer.
The CRT cathode voltage is -2 kV and the CRT anode voltage is +8 kV.  
Total CRT acceleration is 10 kV (cathode −2 kV, anode +8 kV).
 
A Tektronix 453 consumes 100 W power and weighs 29 pounds (13.2 kg).
A Tektronix 453 consumes 100 W power and weighs 29 pounds (13.2 kg).
Part of the heft of this scope is due to its very sturdy aluminum frame and covers.  
Part of the heft of this scope is due to its very sturdy aluminum frame and covers.  
The 453 came with a rigid metal front panel cover with locking latches that protected the scope while it is in transit.   
The 453 came with a rigid metal front panel cover with locking latches that protected the scope while it is in transit.   
This cover has a compartment for storing probes and accessories.   
This cover has a compartment for storing probes and accessories.   
Inside the 453, the electronics are rather densely packed in order for the scope to be compact.   
Inside the 453, the electronics are rather densely packed in order for the scope to be compact.   
The top and bottom cover of the case separate easily using an ingenious thumb screw locking system - truly  
The top and bottom cover of the case separate easily using an ingenious thumb screw locking system - truly  
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The 453A Mod 127C appears in the 1971 Television Products Catalog, with the description:
The 453A Mod 127C appears in the 1971 Television Products Catalog, with the description:
<blockquote>
<blockquote>
With the Mod 127C, and Internal TV Sync Separator circuit permits
With the Mod 127C, and Internal TV Sync Separator circuit permits stable internal line or Field-rate triggering from displayed composite
stable internal line or Field-rate triggering from displayed composite
video or composite sync waveforms.  External /10 trigger sources are replaced by Internal TV Sync positions providing Line sync pulses to the
video or composite sync waveforms.  External /10 trigger sources are  
replaced by Internal TV Sync positions providing Line sync pulses to the
B Sweep circuit and either Field or Line sync pulses to the A sweep circuit.
B Sweep circuit and either Field or Line sync pulses to the A sweep circuit.
</blockquote>
</blockquote>
The 453 has a 182 °F / 83 °C thermal cut-out switch.


==Links==
==Links==
* [https://youtube.com/watch?v=SESxlqvbzig Gale Morris on the history of the Tektronix 453 Oscilloscope] (YouTube)
* [https://youtube.com/watch?v=SESxlqvbzig Gale Morris on the history of the Tektronix 453 Oscilloscope] (YouTube)
* [http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=295306&hilit=453+rewind&start=20 Antique Radio Forum thread discussing Tek 453 HV transformer]
* [https://www.antiqueradios.com/forums/viewtopic.php?f=8&t=295306&hilit=453+rewind&start=20 Antique Radio Forum thread discussing Tek 453 HV transformer]
* [https://web.archive.org/web/20131026150847/http://www.diyguitarist.com/TestEquipment/Tektronix453.htm Paul Marossy's Tek 453 page (archived copy, original site down as of Feb 2015)]
* [https://web.archive.org/web/20131026150847/http://www.diyguitarist.com/TestEquipment/Tektronix453.htm Paul Marossy's Tek 453 page (archived copy, original site down as of Feb 2015)]
* [http://www.reprise.com/host/scopes/ Bill's Tektronix 453 and 454 Info Pages]
* [https://w140.com/gao_B-176564.txt US Government Accounting Office Purchasing Decision and Discussion of  453 Mod 703H (PDF)]
* [http://w140.com/gao_B-176564.txt US Government Accounting Office Purchasing Decision and Discussion of  453 Mod 703H (PDF)]
* [https://readingjimwilliams.blogspot.co.at/2011/07/scope-sunday-3.html Reading Jim Williams blog: Scope Sunday #3 - Tek 453 story]
* [http://readingjimwilliams.blogspot.co.at/2011/07/scope-sunday-3.html Reading Jim Williams blog: Scope Sunday #3 - Tek 453 story]
* [https://web.archive.org/web/2017*/http://www.reprise.com/host/scopes/ Bill's Tektronix 453 and 454 Info Pages] (defunct, link via Internet Archive)
* [http://vondervotteimittiss.com/belfry/?p=248 A 453 HV supply repair] (nice pictures)
<!-- Dead link: [http://vondervotteimittiss.com/belfry/?p=248 A 453 HV supply repair] (nice pictures) -->


==Pictures==
==Pictures==
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{{Parts|453}}
{{Parts|453}}
{{Parts|453A}}


[[Category:400 series scopes]]
[[Category:400 series scopes]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/70503"

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