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The '''Tektronix Type J''' is a 35 MHz dual-trace plug-in for [[500-series scopes]] which never went into production.
The '''Tektronix Type J''' is a 35 MHz dual-trace plug-in for [[500-series scopes]] which never went into production.
It was designed by [[Ron Olson]] with help from [[Phil Crosby]].
Regarding Type J development with Ron Olson, Phil Crosby recalls:
<blockquote>
I was helping him to pursue parasitic oscillations (we used to call it "bird hunting").
It was common to say when an amplifier had a parasitic oscillation to say that it "sung".
At one point I was peering closely at a J unit prototype while Ron was probing it and a finger on his left hand touched the +225.
The reflex caused the back of his hand to strike my nose pretty hard.
Damn near bloodied it.
Vacuum-tube voltages and solid-state devices had an uneasy relationship.
In those days, a common probing tool was the point of a #2 pencil.
</blockquote>


The Type J's tentative announcement was in 1963.
The Type J's tentative announcement was in 1963.
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which was [[introduced in 1964]].
which was [[introduced in 1964]].
The [[547]] training guide, dated December 30th, 1963 mentions "a new dual trace plug-in, the 1A1 (also known as the J)."
The [[547]] training guide, dated December 30th, 1963 mentions "a new dual trace plug-in, the 1A1 (also known as the J)."
Note: The Type J does not have a [[547#Spoiler_Switch|spoiler switch]] hole in the rear panel, while the 1A1 does have such a hole.


* [http://w140.com/Tek_Type_J_tentative.pdf Tektronix Type J Tentative Specs (PDF)]
<!-- * [http://w140.com/Tek_Type_J_tentative.pdf Tektronix Type J Tentative Specs (PDF)] -->
 
* [[Media:type_j_tentative.pdf|Tektronix Type J Tentative Specs (PDF, OCR)]]
* [[Media:type_j_tentative.pdf|Tektronix Type J Tentative Specs (PDF, OCR)]]


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Tek type j.jpg
Tek type j.jpg
Dec 1963 service scope type j.png|Reference to Type J in December 1963 Service Scope
Dec 1963 service scope type j.png|Reference to Type J in December 1963 Service Scope
Late tek type j front.jpg|Late Type J with spoiler switch hole
Late tek type j left.jpg|Late Type J with spoiler switch hole
Late tek type j right.jpg|Late Type J with spoiler switch hole
Late tek type j rear.jpg|Late Type J with spoiler switch hole
</gallery>
</gallery>


[[Category:500 series plugins]]
[[Category:500 series plugins]]
[[Category:Prototypes]]

Revision as of 00:40, 3 February 2021

The Tektronix Type J is a 35 MHz dual-trace plug-in for 500-series scopes which never went into production. It was designed by Ron Olson with help from Phil Crosby.

Regarding Type J development with Ron Olson, Phil Crosby recalls:

I was helping him to pursue parasitic oscillations (we used to call it "bird hunting"). It was common to say when an amplifier had a parasitic oscillation to say that it "sung". At one point I was peering closely at a J unit prototype while Ron was probing it and a finger on his left hand touched the +225. The reflex caused the back of his hand to strike my nose pretty hard. Damn near bloodied it. Vacuum-tube voltages and solid-state devices had an uneasy relationship. In those days, a common probing tool was the point of a #2 pencil.

The Type J's tentative announcement was in 1963. It appears to be similar to the 1A1, which was introduced in 1964. The 547 training guide, dated December 30th, 1963 mentions "a new dual trace plug-in, the 1A1 (also known as the J)." Note: The Type J does not have a spoiler switch hole in the rear panel, while the 1A1 does have such a hole.