Introduction to the 7000-Series Oscilloscopes: Difference between revisions

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In August of 1969, Tektronix issued a [[Media:Aug 1969 Catalog Supplement.pdf|supplement catalog]]  
In August of 1969, Tektronix issued a [[Media:Aug 1969 Catalog Supplement.pdf | supplement catalog]]  
featuring a new series of instruments, called the '''[[7000-series scopes|7000 Series]]'''.
featuring a new series of instruments called the '''[[7000-series scopes | 7000 Series]]'''.


[[Howard Vollum]] himself wrote the introduction message on page 1 of this supplement, where he presented the 7000 series as a replacement to the [[500-series_scopes|500 scope series]], emphasizing the necessity to switch to a new platform for modular high-end scopes due to the limitations of the original [[500-series_scopes|500 series platform]] designed in 1953.  
[[Howard Vollum]] himself wrote the introduction message on page 1 of this supplement, where he presented the 7000 series as a replacement to the [[500-series_scopes | 500 scope series]], emphasizing the necessity to switch to a new platform for modular high-end scopes due to the limitations of the original [[500-series_scopes | 500 series platform]] designed in 1953.  


According to Vollum, a significant portion of the previous two years' $28 million engineering budget (~250m in 2023 dollars!) were spent to develop the initial components and products of the 7000 series.  
According to Vollum, a significant portion of the previous two years' $28 million engineering budget (~250m in 2023 dollars!) were spent to develop the initial components and products of the 7000 series.  


The initial family [[introduced in 1969|introduction in 1969]] consisted of the 90 MHz [[7504]] and 150 MHz [[7704]] mainframes, and no less than 13 plug-ins − the [[7A11]] FET-probe amplifier, [[7A12]] dual-channel amplifier, [[7A13]] differential comparator, [[7A14]] current-probe amplifier, [[7A16]] singles-channel amplifier, [[7A22]] differential amplifier, [[7B51]] and [[7B70]] delaying timebases, [[7B50]] and [[7B70]] delayed timebases, [[7S11]]/[[7T11]] sampling system, and the [[7M11]] delay line.
The initial family [[introduced in 1969 | introduction in 1969]] consisted of the 90 MHz [[7504]] and 150 MHz [[7704]] mainframes, and no less than 13 plug-ins − the [[7A11]] FET-probe amplifier, [[7A12]] dual-channel amplifier, [[7A13]] differential comparator, [[7A14]] current-probe amplifier, [[7A16]] singles-channel amplifier, [[7A22]] differential amplifier, [[7B51]] and [[7B70]] delaying time bases, [[7B50]] and [[7B70]] delayed time bases, [[7S11]]/[[7T11]] sampling system, and the [[7M11]] delay line.


While the original [[7504]] and [[7704]] mainframes were short-lived, the series lasted until the early 1990s, with some of the original plug-ins like the [[7A22]] or the [[7S11]] remaining in production throughout.
While the original [[7504]] and [[7704]] mainframes were short-lived, the series lasted until the early 1990s, with some of the original plug-ins like the [[7A22]] or the [[7S11]] remaining in production throughout.


==Common features of 7000-series scopes==
==Common features of 7000-series scopes==
* Designed for [[7000-series plug-ins|plug-ins]] for flexibility. The last digit of the scope designation refers to the total number of plug-in bays.
* Designed for [[7000-series plug-ins | plug-ins]] for flexibility. The last digit of the scope designation refers to the total number of plug-in bays.
* One ([[7912]]) or two (all other 7000) vertical plug-in bays
* One ([[7912]]) or two (all other 7000) vertical plug-in bays
* Zero ([[7612D]]), one (7xx3, 7912) or two (7xx4) horizontal plug-in bays
* Zero ([[7612D]]), one (7xx3, 7912) or two (7xx4) horizontal plug-in bays
* Horizontal and vertical plug-ins can be used in bays of the other type, e.g. an amplifier in a timebase bay can be used for X-Y display
* Horizontal and vertical plug-ins can be used in bays of the other type, e.g. an amplifier in a time base bay can be used for X-Y display
* [[7000_series_readout_system|On screen readout controlled from plug-ins]] including [[BNC_connector_with_readout_ring|probe scaling]]
* [[7000_series_readout_system     | On screen readout controlled from plug-ins]] including [[BNC_connector_with_readout_ring | probe scaling]]
* [[7000_Series_plug-in_interface|Differential, calibrated 50 Ω signal and trigger connections from plug-in to backplane]]
* [[7000_Series_plug-in_interface   | Differential, calibrated 50 Ω signal and trigger connections from plug-in to backplane]]


==Meaning of the type numbers==
==Meaning of the type numbers==
* first digit − series
* first digit − series
** 7000
** 7000
* second digit − bandwith
* second digit − bandwidth
** 3: 25 MHz
** 3: 25 MHz
** 4: 65 MHz
** 4: 65 MHz
Line 32: Line 32:
* third digit − CRT type / storage
* third digit − CRT type / storage
** 0: no storage
** 0: no storage
** 1: variable-persistence ([[7514]]: bistable) storage
** 1: single-mode analog storage: variable-persistence or bistable storage
** 2: multi-mode analog storage
** 2: multi-mode analog storage
** 3: fast multi-mode analog storage
** 3: fast multi-mode analog storage
Line 42: Line 42:


Suffix A or B: later variant
Suffix A or B: later variant
Suffix N: no readout


==7000 series functional color code==
==7000 series functional color code==
:{| cellpadding="4"
:{| cellpadding="9" style="text-align:center; vertical-align:middle;
|-
|-
| bgcolor="LightBlue" | Mode Selection
| bgcolor="#84bded" | Display Mode Selection
|-
|-
| bgcolor="LightGreen" | Trigger Source or Control
| bgcolor="#77ab68" | Trigger Source or Control
|-
|-
| bgcolor="Red" | Uncalibrated Variable
| bgcolor="#e63126" | Uncalibrated Variable
|-
|-
| bgcolor="Gray"  | Denotes functional relation
| bgcolor="#dad9de"  | Denotes functional relation
|-
| bgcolor="#f4ff2c"  | Caution
|-
| bgcolor="#e1a464"  | Exclusive function
|}
|}
This info was taken from a [https://youtu.be/F_p5YsIImMY?t=954 video shared by the VintageTEK Museum on YouTube]
<gallery>
7k series colour coding.png                          | Diagram grabbed from the video
Tektronix New Products 1969-08 page 9 color code.jpg | Taken from page 9 of the [[Media:Aug 1969 Catalog Supplement.pdf | New Products supplement, August 1969 ]]
</gallery>
==Overview==
{| class="wikitable sortable"
|+ 7000 series overview
|-
! rowspan="2" | Scope
! rowspan="2" | Bandwith<br />[MHz]
! rowspan="2" | Plug-in<br />Bays
! rowspan="2" | Start <br /> of Sales
! rowspan="2" | End <br /> of Sales
! rowspan="2" | CRT Type
! rowspan="2" | CRT Raster<br />[cm/Div]
! Bistable<br /><small>(reduced scan)</small>
! Fast Bistable<br /><small>(reduced scan)</small>
! Var-Pers.<br /><small>(reduced scan)</small>
! Fast Var-Pers.<br /><small>(reduced scan)</small>
! rowspan="2" | Digital<br />storage
! rowspan="2" | Readout
! rowspan="2" | Power<br />[W]
! rowspan="2" | Cooling<br />fan
! rowspan="2" | Weight<br />[kg]
|-
! colspan=4 |  writing speed [div/µs]
|-
| [[7313]]  ||  25 || 3 || 1972 || 1979 || split-screen bi-stable storage || 1.0  ||  0.5 ||  -      ||  -  ||  -        ||  -  || YES || 170 ||  -  ||  ?
|-
| [[7403N]]  ||  65 || 3 || 1970 || 1975 || standard                      || 1.22 ||  -  ||  -      ||  -  ||  -        ||  -  ||  -  || 130 ||  -  || 13.6
|-
| [[R7403N]] ||  65 || 3 || 1971 || 1975 || standard                      || 1.22 ||  -  ||  -      ||  -  ||  -        ||  -  ||  -  ||  ?  ||  -  ||  ?
|-
| [[7503]]  ||  90 || 3 || 1970 || 1972 || standard                      || 1.0  ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 258 ||  -  || 21.3
|-
| [[7504]]  ||  90 || 4 || 1969 || 1971 || standard                      || 1.0  ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 285 ||  -  || 24.6
|-
| [[7514]]  ||  90 || 4 || 1970 || 1974 || split-screen bi-stable storage || 1.0  ||  1.0 ||  -      ||  -  ||  -        ||  -  || YES || 225 ||  -  || 19.5
|-
| [[7603]]  ||  100 || 3 || 1972 || 1990 || standard                      || 1.22 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 170 || Some versions || 13.6
|- 
| [[R7603]]  ||  100 || 3 || 1973 || 1990 || standard                      || 1.22 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 170 ||  ?  || 13.6
|-
| [[7613]]  ||  100 || 3 || 1972 || 1990 || variable-persistence storage  ||  0.9 ||  -  ||  -      ||  5  ||  -        ||  -  || YES || 170 || YES || 13.6
|-
| [[R7613]]  ||  100 || 3 || 1973 || 1990 || variable-persistence storage  ||  0.9 ||  -  ||  -      ||  5  ||  -        ||  -  || YES || 180 || YES || 13.6
|-
| [[7623]]  ||  100 || 3 || 1972 || 1975 || multi-mode transfer storage    ||  0.9 || 0.03 ||  50      || 0.5 || 100        ||  -  || YES || 170 ||  -  || 13.6
|-
| [[R7623]]  ||  100 || 3 || 1973 || 1974 || multi-mode transfer storage    ||  0.9 || 0.03 ||  50      || 0.5 || 100        ||  -  || YES || 180 ||  -  ||  ?
|- 
| [[7623A]]  ||  100 || 3 || 1975 || 1990 || multi-mode transfer storage    ||  0.9 || 0.03 ||  50      || 0.5 || 150        ||  -  || YES || 170 ||  -  || 13.6
|-
| [[R7623A]] ||  100 || 3 || 1975 || 1991 || multi-mode transfer storage    ||  0.9 || 0.03 ||  50      || 0.5 || 150        ||  -  || YES || 180 ||  -  || 13.6
|-
| [[7623B]]  ||  100 || 3 || 1991 || 1992 || multi-mode transfer storage    ||  0.9 || 0.03 (Y,?) ||  50 (Y,?) || 0.5 (Y,?) || 150 (2200) ||  -  || YES ||  ?  ||  -  ||  ?
|-
| [[R7623B]] ||  100 || 3 || 1991 || 1992 || multi-mode transfer storage    ||  0.9 || 0.03 (Y,?) ||  50 (Y,?) || 0.5 (Y,?) || 150 (2200) ||  -  || YES ||  ?  ||  -  ||  ?
|-
| [[7633]]  ||  100 || 3 || 1975 || 1990 || multi-mode transfer storage    ||  0.9 || 0.03 (0.2) ||  50 (400) || 0.5 (3) || 150 (2222) ||  -  || YES || 170 ||  -  || 13.6
|-
| [[R7633]]  ||  100 || 3 || 1975 || 1990 || multi-mode transfer storage    ||  0.9 || 0.03 (0.2) ||  50 (400) || 0.5 (3) || 150 (2222) ||  -  || YES || 180 ||  -  || 13.6
|-
| [[7704]]  ||  150 || 4 || 1969 || 1972 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 210 ||  -  || 19.1
|-
| [[R7704]]  ||  150 || 4 || 1970 || 1985 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES ||  ?  ||  -  ||  ?
|-
| [[7704A]]  ||  200 || 4 || 1972 || 1987 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 180 ||  -  || 13.6
|-
| [[7834]]  ||  400 || 4 || 1977 || 1986 || multi-mode transfer storage    ||  0.9 || 0.03 (0.2) ||  50 (776) || 2.0 (12) || 300 (5500) ||  -  || YES || 215 || YES || 17.0
|-
| [[7844]]  ||  400 || 4 || 1974 || 1988 || dual beam                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 235 || YES || 16.3
|-
| [[R7844]]  ||  400 || 4 || 1975 || 1992 || dual beam                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 235 || YES || 15.0
|-
| [[7854]]  ||  400 || 4 || 1980 || 1990 || standard / digital            ||  1.0 ||  -  ||  -      ||  -  ||  -        || YES || YES || 230 || YES || 19.0
|-
| [[7904]]  ||  500 || 4 || 1971 || 1983 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 190 ||  -  || 13.5
|-
| [[7903]]  ||  500 || 3 || ? || ? || standard                              ||  1.0 ||    -  ||  -      ||  -  ||  -        ||  -  || YES || ?  ||  -  || ?
|-
| [[R7903]]  ||  500 || 3 || 1974 || 1982 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 160 ||  -  || 13.5
|-
| [[7904A]]  ||  500 || 4 || 1984 || 1990 || standard                      ||  1.0 ||  -  ||  -      ||  -  ||  -        ||  -  || YES || 190 || YES || 13.5
|-
| [[7934]]  ||  500 || 4 || 1987 || 1990 || multi-mode transfer storage    ||  0.9 || 0.03 (0.2) ||  50 (776) || 2.0 (12) || 300 (8800) ||  -  || YES || 230 || YES || 17.2
|-
| [[7104]]  || 1000 || 4 || 1978 || 1990 || micro-channel plate            || 0.85 ||  -  ||  -      ||  -  || -          ||  -  || YES || 215 || YES || 19.8
|-
| [[R7103]]  || 1000 || 3 || 1985 || 1990 || micro-channel plate            || 0.85 ||  -  ||  -      ||  -  || -          ||  -  || YES ||  ?  || YES ||  ?
|-
| [[7D20]]  ||  70 || - || 1982 || 1992 || - (digital storage plug-in)    || -    ||  -  ||  -      ||  -  || -          || YES || YES ||  -  ||  -  ||  3.9
|-
| [[7612D]]  ||  90 || 2 || 1980 || 1988 || - (digitizer)                  || -    ||  -  ||  -      ||  -  || -          || YES ||  ?  || 400 || YES || 24.95
|-
| [[R7912]]  ||  500 || 2 || 1973 || 1978 || - (digitizer)                  || -    ||  -  ||  -      ||  -  || -          || YES ||  YES  ||  ?  || YES ||  ?
|-
| [[7912AD]] ||  500 || 2 || 1978 || 1987 || - (digitizer)                  || -    ||  -  ||  -      ||  -  || -          || YES ||  YES  || 360 || YES || 24.7
|-
| [[7912HB]] ||  750 || 2 || 1987 || 1989 || - (digitizer)                  || -    ||  -  ||  -      ||  -  || -          || YES ||  YES  ||  ?  || YES ||  ?
|-
| [[P7001]]  ||  175 || - || 1973 || 1981 || - (digitizer)                  || -    ||  -  ||  -      ||  -  || -          || YES ||  ?  || 120 || YES || 21.8
|}
==Suitable Carts==
* [[203-2]] (1970) − 3 bay
* [[204-2]] (1970) − 4 bay
* [[Lab Cart Model 3]] (1976) − 4 bay
* [[K213]] (1985) − 4 bay


==Links==
==Links==
* [[7000-series_scopes|Scopes]]
* [[7000-series_scopes                       | Scopes ]]
* [[7000-series plug-ins|Plug-ins]]
* [[7000-series plug-ins                     | Plug-ins ]]
* [[7000 series readout system|Readout system]]
* [[7000 series readout system               | Readout system ]]
* [[7000 Series plug-in interface|Backplane Interface]]
* [[7000 Series plug-in interface             | Backplane Interface ]]
* [[7000-series remote control connector]]
* [[7000-series remote control connector       ]]
* [[List of 7000 series equipment|List of 7000 series equipment]]
* [[List of 7000 series equipment             | List of 7000 series equipment ]]
* [[Media:Tektronix7xxx Assemblies.pdf|Tektronix 7k Series Assemblies, compiled by Shannon Hill (PDF)]]
* [[Media:Tektronix7xxx Assemblies.pdf       | Tektronix 7k Series Assemblies, compiled by Shannon Hill ]]
* [[Media:Introduction to the 7000 Series Switching and Logic Circuits (Ken Parker, 1970).pdf| Introduction to the 7000 Series Switching and Logic Circuits (Ken Parker, 1970)]] (PDF,OCR,1MB)
* [[Media:Introduction to the 7000 Series Switching and Logic Circuits (Ken Parker, 1970).pdf | Introduction to the 7000 Series Switching and Logic Circuits (Ken Parker, 1970) ]]
* [[7000 plugin packing|Plug-in packaging]]
* [[7000 plugin packing                       | Plug-in packaging ]]
* [[Back-lit switches]]
* [[Back-lit switches                         ]]
* [[Soviet 7000-series clones|Soviet Clones]]
* [[Soviet 7000-series clones                 | Soviet Clones ]]
* [http://www.k100.biz/parade.htm Gianni Becattini's book dedicated to the 7000-Series]
* [http://www.k100.biz/e-Books.html            Gianni Becattini's book dedicated to the 7000-Series ]
* [https://www.youtube.com/watch?v=F_p5YsIImMY  How the frontend design was developed ] @ YouTube
 


[[Category:7000 series scopes]]
[[Category:7000 series scopes]]

Latest revision as of 08:20, 13 August 2024

In August of 1969, Tektronix issued a supplement catalog featuring a new series of instruments called the 7000 Series.

Howard Vollum himself wrote the introduction message on page 1 of this supplement, where he presented the 7000 series as a replacement to the 500 scope series, emphasizing the necessity to switch to a new platform for modular high-end scopes due to the limitations of the original 500 series platform designed in 1953.

According to Vollum, a significant portion of the previous two years' $28 million engineering budget (~250m in 2023 dollars!) were spent to develop the initial components and products of the 7000 series.

The initial family introduction in 1969 consisted of the 90 MHz 7504 and 150 MHz 7704 mainframes, and no less than 13 plug-ins − the 7A11 FET-probe amplifier, 7A12 dual-channel amplifier, 7A13 differential comparator, 7A14 current-probe amplifier, 7A16 singles-channel amplifier, 7A22 differential amplifier, 7B51 and 7B70 delaying time bases, 7B50 and 7B70 delayed time bases, 7S11/7T11 sampling system, and the 7M11 delay line.

While the original 7504 and 7704 mainframes were short-lived, the series lasted until the early 1990s, with some of the original plug-ins like the 7A22 or the 7S11 remaining in production throughout.

Common features of 7000-series scopes

Meaning of the type numbers

  • first digit − series
    • 7000
  • second digit − bandwidth
    • 3: 25 MHz
    • 4: 65 MHz
    • 5: 90/100 MHz
    • 6: 100 MHz
    • 7: 150/200 MHz
    • 8: 400 MHz
    • 9: 500 MHz
    • 1: 1000 MHz
  • third digit − CRT type / storage
    • 0: no storage
    • 1: single-mode analog storage: variable-persistence or bistable storage
    • 2: multi-mode analog storage
    • 3: fast multi-mode analog storage
    • 4: dual-beam
    • 5: digital storage
  • fourth digit − number of bays

Prefix R: Rack-mount version

Suffix A or B: later variant

Suffix N: no readout

7000 series functional color code

Display Mode Selection
Trigger Source or Control
Uncalibrated Variable
Denotes functional relation
Caution
Exclusive function


This info was taken from a video shared by the VintageTEK Museum on YouTube

Overview

7000 series overview
Scope Bandwith
[MHz] 		Plug-in
Bays 		Start
of Sales 		End
of Sales 		CRT Type CRT Raster
[cm/Div] 		Bistable
(reduced scan) 		Fast Bistable
(reduced scan) 		Var-Pers.
(reduced scan) 		Fast Var-Pers.
(reduced scan) 		Digital
storage 		Readout Power
[W] 		Cooling
fan 		Weight
[kg]
writing speed [div/µs]
7313 25 3 1972 1979 split-screen bi-stable storage 1.0 0.5 - - - - YES 170 - ?
7403N 65 3 1970 1975 standard 1.22 - - - - - - 130 - 13.6
R7403N 65 3 1971 1975 standard 1.22 - - - - - - ? - ?
7503 90 3 1970 1972 standard 1.0 - - - - - YES 258 - 21.3
7504 90 4 1969 1971 standard 1.0 - - - - - YES 285 - 24.6
7514 90 4 1970 1974 split-screen bi-stable storage 1.0 1.0 - - - - YES 225 - 19.5
7603 100 3 1972 1990 standard 1.22 - - - - - YES 170 Some versions 13.6
R7603 100 3 1973 1990 standard 1.22 - - - - - YES 170 ? 13.6
7613 100 3 1972 1990 variable-persistence storage 0.9 - - 5 - - YES 170 YES 13.6
R7613 100 3 1973 1990 variable-persistence storage 0.9 - - 5 - - YES 180 YES 13.6
7623 100 3 1972 1975 multi-mode transfer storage 0.9 0.03 50 0.5 100 - YES 170 - 13.6
R7623 100 3 1973 1974 multi-mode transfer storage 0.9 0.03 50 0.5 100 - YES 180 - ?
7623A 100 3 1975 1990 multi-mode transfer storage 0.9 0.03 50 0.5 150 - YES 170 - 13.6
R7623A 100 3 1975 1991 multi-mode transfer storage 0.9 0.03 50 0.5 150 - YES 180 - 13.6
7623B 100 3 1991 1992 multi-mode transfer storage 0.9 0.03 (Y,?) 50 (Y,?) 0.5 (Y,?) 150 (2200) - YES ? - ?
R7623B 100 3 1991 1992 multi-mode transfer storage 0.9 0.03 (Y,?) 50 (Y,?) 0.5 (Y,?) 150 (2200) - YES ? - ?
7633 100 3 1975 1990 multi-mode transfer storage 0.9 0.03 (0.2) 50 (400) 0.5 (3) 150 (2222) - YES 170 - 13.6
R7633 100 3 1975 1990 multi-mode transfer storage 0.9 0.03 (0.2) 50 (400) 0.5 (3) 150 (2222) - YES 180 - 13.6
7704 150 4 1969 1972 standard 1.0 - - - - - YES 210 - 19.1
R7704 150 4 1970 1985 standard 1.0 - - - - - YES ? - ?
7704A 200 4 1972 1987 standard 1.0 - - - - - YES 180 - 13.6
7834 400 4 1977 1986 multi-mode transfer storage 0.9 0.03 (0.2) 50 (776) 2.0 (12) 300 (5500) - YES 215 YES 17.0
7844 400 4 1974 1988 dual beam 1.0 - - - - - YES 235 YES 16.3
R7844 400 4 1975 1992 dual beam 1.0 - - - - - YES 235 YES 15.0
7854 400 4 1980 1990 standard / digital 1.0 - - - - YES YES 230 YES 19.0
7904 500 4 1971 1983 standard 1.0 - - - - - YES 190 - 13.5
7903 500 3 ? ? standard 1.0 - - - - - YES ? - ?
R7903 500 3 1974 1982 standard 1.0 - - - - - YES 160 - 13.5
7904A 500 4 1984 1990 standard 1.0 - - - - - YES 190 YES 13.5
7934 500 4 1987 1990 multi-mode transfer storage 0.9 0.03 (0.2) 50 (776) 2.0 (12) 300 (8800) - YES 230 YES 17.2
7104 1000 4 1978 1990 micro-channel plate 0.85 - - - - - YES 215 YES 19.8
R7103 1000 3 1985 1990 micro-channel plate 0.85 - - - - - YES ? YES ?
7D20 70 - 1982 1992 - (digital storage plug-in) - - - - - YES YES - - 3.9
7612D 90 2 1980 1988 - (digitizer) - - - - - YES ? 400 YES 24.95
R7912 500 2 1973 1978 - (digitizer) - - - - - YES YES ? YES ?
7912AD 500 2 1978 1987 - (digitizer) - - - - - YES YES 360 YES 24.7
7912HB 750 2 1987 1989 - (digitizer) - - - - - YES YES ? YES ?
P7001 175 - 1973 1981 - (digitizer) - - - - - YES ? 120 YES 21.8

Suitable Carts

Links

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