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556: Difference between revisions
→Challenges in the Vertical Signal Path
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already elevated due to the vacuum tube output stage, from increasing further. | already elevated due to the vacuum tube output stage, from increasing further. | ||
At that time, no silicon transistors were available that could meet the speed and voltage requirements, | At that time, no silicon transistors were available that could meet the speed and voltage requirements, | ||
so we were constrained to use the 2N2929, a PNP germanium transistor that could barely meet the voltage and power dissipation requirements. | so we were constrained to use the 2N2929, a PNP germanium transistor that could barely meet the voltage and power dissipation requirements. | ||
<ref> | |||
In the mid-60s, Tektronix had no resident IC design or fabrication facility, | |||
leaving us constrained by the availability of discrete transistors. | |||
The speed, voltage, and power dissipation requirements of the output devices, | |||
together with the need for high writing speed and small spot size always limited the performance of vertical amplifiers. | |||
</ref> | |||
The seven or eight inches of 93 ohm coaxial cable required a couple of additional time constants to compensate for skin-effect loss. | The seven or eight inches of 93 ohm coaxial cable required a couple of additional time constants to compensate for skin-effect loss. | ||