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7A22: Difference between revisions
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The '''Tektronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], designed by [[Val Garuts]] and produced from about 1969 to 1991. Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input or front panel signal output. | The '''Tektronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], designed by [[Val Garuts]] and produced from about 1969 to 1991. Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input or front panel signal output. | ||
The 7A22's input sensitivity reaches down to 10 μV/Div. Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges. | |||
Applications include audio, biological signals, sensors etc. | Applications include audio, biological signals, sensors etc. | ||
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The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications in the [[3A9]], [[5A22N]], [[AM502]], and [[5030]]/[[5031]] ([[26A2]] too?). | The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications in the [[3A9]], [[5A22N]], [[AM502]], and [[5030]]/[[5031]] ([[26A2]] too?). | ||
The 7A22 | <blockquote> | ||
[[John Addis]] [[Preamble DA1855|says]]: | |||
The [[1A7A]] (designed by [[Thor Hallen]]) and the 7A22 (designed by [[Val Garuts]]) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts. Val does not remember who created the circuit, and Thor died in 2002. | |||
</blockquote> | |||
==Prices== | ==Prices== | ||