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7514: Difference between revisions
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The stored writing speed is 1 cm/sec. | The stored writing speed is 1 cm/sec. | ||
==Background== | |||
Regarding the 7514, Ron Barrett WB7PMP says: | |||
<blockquote> | |||
I used to work at Tek and took the opportunity to purchase a 7514 from Tek Surplus in 1978. | |||
I have used it on and off over the years and it has never quit. | |||
The 7514 was the pinnacle of the original generation 7000 series. | |||
As I found out from it's project manager and my division engineering manager at the time it pushed design to the limit in two areas. | |||
The basic electrical and mechanical design was based on the 7504 which is a real boat-anchor. | |||
In order to supply the additional power for storage and to reduce weight, | |||
one of the first switching power supplies to appear in test and measurement equipment was designed. | |||
This was a nontrivial achievement in the late 60's. | |||
The resulting design with some modifications was used for all subsequent 7000 series mainframes. | |||
When combined with the goal to not degrade 7504 on-screen performance, | |||
elevated storage with split-screen capabilities and every storage function imagined at the time | |||
made electrical design difficult and CRT design nearly impossible. | |||
Lesson learned: future generations of Tek CRT storage did not try to serve all needs. | |||
So the 7514 is somewhat unique, was very expensive and had a relatively short life in production | |||
as Tek rushed to introduce second generation products which were cheaper to produce. | |||
No more gold circuit boards like those used in the 7514. | |||
There have been a few of these pop up on E-bay but none have approached the condition of this one. | |||
I completely calibrated it several years ago and checked it out just prior to listing. | |||
As you can see from the photos, storage works fine and non-store rise time is about 3ns with very clean transient response. | |||
Measured bandwidth was 108 MHz and would be more if the spec. on aberrations was pushed to the limit. | |||
Spot size, trace noise and writing rate are what one would expect. | |||
</blockquote> | |||
==Links== | ==Links== | ||
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==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
File:Tek 7514 1.jpg | |||
File:Tek 7514 3.jpg | |||
File:Tek 7514 4.jpg | |||
File:Tek 7514 5.jpg | |||
File:Tek 7514 6.jpg | |||
File:Tek 7514 7.jpg | |||
File:Tek 7514 8.jpg | |||
File:Tek 7514 9.jpg | |||
File:Tek 7514 2.jpg|Spare boards from a 7504 also work in the 7514 | |||
File:Tek7514.jpg | 7514 | File:Tek7514.jpg | 7514 | ||
File:7514_Front.jpg | 7514 Front | File:7514_Front.jpg | 7514 Front | ||