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The Tektronix Type 221 is a miniature 5MHz analog scope [[introduced in 1973]].
{{Oscilloscope Sidebar
It has a switching power supply and built-in rechargeable batteries (which are
|manufacturer=Tektronix
a maintenance issue).  It has a transformer-coupled trigger circuit which
|series=200-series scopes
would seem to preclude DC level-based triggering.  The trigger circuit uses a
|model=221
[[1N3713]] 1mA [[tunnel_diodes|tunnel diode]].  The vertical output amplifier that drives the
|summary=5 MHz miniature analog scope
CRT plates is two opamps made from discrete transistors.  One drives the top deflection
|image=Tek 221 1.jpg
plate and the other drives the bottom plate.
|caption=Tektronix 221
|introduced=1975
|discontinued=1991
|manuals=
* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] (OCR)
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]]
}}
The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]].


* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)]
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 5 MHz }}
{{Spec | Input Impedance | 1 MΩ // 29 pF }}
{{Spec | Input Voltage | max. 600 V DC + Peak AC, or 600 V<sub>p-p</sub> AC  }}
{{Spec | Sweep Range | 200 ms to 1 μs, 17 steps }}
{{Spec | CRT | [[154-0705-00]], 6 Div (V) × 10 Div (H), 1 kV acceleration }}
{{Spec | Operating Time on Battery | 2-3 hours }}
{{Spec | Internal Battery | 10 rechargeable NiCd cells }}
{{Spec | Line Voltage | 90-250 V<sub>AC</sub> @ 48−62 Hz, or 80-250 V<sub>DC</sub>}}
{{Spec | Power Consumption | 5 W @ 250 V}}
{{Spec | Dimensions  | (H/W/D) 3" × 5.25" × 9" (7.6 cm × 13.2 cm × 22.8 cm)  }}
{{Spec | Weight | 3.5 lb (1.5 kg) }}
{{EndSpecs}}


==Links==
{{Documents|Link=221}}
==Prices==
{| class="wikitable"
|-
! Year
! 1976
! 1977
! 1980
! 1982
! 1986
|-
! Catalog Price
|align=right| $825
|align=right| $975
|align=right| $1,325
|align=right| $1,600
|align=right| $2,260
|-
! In 2023 Dollars
| $4,500
| $5,000
| $4,900
| $5,100
| $6,300
|}
==Internals==
The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue). 
It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. 
The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. 
The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. 
One drives the top deflection plate, the other the bottom plate.
The power supply in the 221 uses three transformers – [[120-0876-00]] (T633) in the line inverter, [[120-0877-00]]/[[120-0946-00]] (T623) in the base drive for the line inverter and [[120-0875-00]] (T701) in HV inverter.
The 221 contains one integrated circuit, a 741 op-amp that creates a virtual ground, otherwise only discrete (including dual) transistors.
MOD 290A is a version of the 221 made for IBM which adds a Single Sweep function and a "Property of IBM" engraving.
==Pictures==
<gallery>
Tek-221_1.jpeg | Side
Tek-221_02.jpeg | Front
Tek 221 1.jpg|Front
Tek 221 right.jpg|Panel of 221
Tek-221_3.jpeg | Panel of 221
Tek 221 probe.jpg|Probe of 221
221-5.jpg|221 with orginal bag
221-2.jpg|221 on top of 565
Tek 221 trace2.jpg
221 IBM Version.jpg| MOD 290A variant for IBM
221 Single_Sweep.jpg| MOD 290A variant for IBM
</gallery>
===Internals===
<gallery>
<gallery>
Image:Tek 221 1.jpg
Tek221_Int_01.jpeg| Tek 221 - Internals, rear
Image:Tek 221 right.jpg
Tek221_Int_02.jpeg| Tek 221 - Internals, LHS
Image:Tek 221 probe.jpg
Tek221_Int_03.jpeg | Tek 221 - Internals, top
Tek221_Int_04.jpeg | Tek 221 - Front Panel A1/A2 board
Tek221_Int_05.jpeg | Tek 221 - CRT & power supply board
Tek221_Int_06.jpeg | Tek 221 - Power supply board
Tek221_Int_10.jpeg | Tek 221 - Power supply board
Tek221_Int_07.jpeg | Tek 221 - Amplifier board
Tek221_Int_08.jpeg | Battery pack (fused)
</gallery>
</gallery>
==Components==
{{Parts|221}}
[[Category:200 series scopes]]

Latest revision as of 15:28, 27 October 2023

Tektronix 221
5 MHz miniature analog scope
Tektronix 221

Produced from 1975 to 1991

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type 221 is a miniature 5 MHz analog scope introduced in 1973.

Key Specifications

Bandwidth DC to 5 MHz
Input Impedance 1 MΩ // 29 pF
Input Voltage max. 600 V DC + Peak AC, or 600 Vp-p AC
Sweep Range 200 ms to 1 μs, 17 steps
CRT 154-0705-00, 6 Div (V) × 10 Div (H), 1 kV acceleration
Operating Time on Battery 2-3 hours
Internal Battery 10 rechargeable NiCd cells
Line Voltage 90-250 VAC @ 48−62 Hz, or 80-250 VDC
Power Consumption 5 W @ 250 V
Dimensions (H/W/D) 3" × 5.25" × 9" (7.6 cm × 13.2 cm × 22.8 cm)
Weight 3.5 lb (1.5 kg)

Links

Documents Referencing 221

Document Class Title Authors Year Links
60AX-4741.pdf Application Note Floating Oscilloscope Measurements ... And Operator Protection 1981 A6901 • A6902 • 221

Prices

Year 1976 1977 1980 1982 1986
Catalog Price $825 $975 $1,325 $1,600 $2,260
In 2023 Dollars $4,500 $5,000 $4,900 $5,100 $6,300

Internals

The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue). It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. The trigger circuit uses a 1N3713 1 mA tunnel diode. The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. One drives the top deflection plate, the other the bottom plate.

The power supply in the 221 uses three transformers – 120-0876-00 (T633) in the line inverter, 120-0877-00/120-0946-00 (T623) in the base drive for the line inverter and 120-0875-00 (T701) in HV inverter.

The 221 contains one integrated circuit, a 741 op-amp that creates a virtual ground, otherwise only discrete (including dual) transistors.

MOD 290A is a version of the 221 made for IBM which adds a Single Sweep function and a "Property of IBM" engraving.

Pictures

  • Side

    Side

  • Front

    Front

  • Front

    Front

  • Panel of 221

    Panel of 221

  • Panel of 221

    Panel of 221

  • Probe of 221

    Probe of 221

  • 221 with orginal bag

    221 with orginal bag

  • 221 on top of 565

    221 on top of 565

  • MOD 290A variant for IBM

    MOD 290A variant for IBM

  • MOD 290A variant for IBM

    MOD 290A variant for IBM

Internals

  • Tek 221 - Internals, rear

    Tek 221 - Internals, rear

  • Tek 221 - Internals, LHS

    Tek 221 - Internals, LHS

  • Tek 221 - Internals, top

    Tek 221 - Internals, top

  • Tek 221 - Front Panel A1/A2 board

    Tek 221 - Front Panel A1/A2 board

  • Tek 221 - CRT & power supply board

    Tek 221 - CRT & power supply board

  • Tek 221 - Power supply board

    Tek 221 - Power supply board

  • Tek 221 - Power supply board

    Tek 221 - Power supply board

  • Tek 221 - Amplifier board

    Tek 221 - Amplifier board

  • Battery pack (fused)

    Battery pack (fused)

Components

Some Parts Used in the 221

Part Part Number(s) Class Description Used in
120-0876-00 120-0876-00 Discrete component pot core transformer 221
154-0705-00 154-0705-00 CRT CRT for miniature scopes 221
STD933 152-0181-00 Discrete component 1 mA, 5 pF germanium tunnel diode 1S2 • 221 • 422
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