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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 | 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 | 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 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. | ||
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) | ||
* [ | * [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)] | ||
* [ | * [https://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] | |||
* [ | * [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]] |