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155-0059-00: Difference between revisions
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The '''155-0059-00''' is a Tek-made HF Amplifier chip. The Tek custom chip | The '''155-0059-00''' is a Tek-made HF Amplifier chip. The Tek custom chip catalog calls it a "Gain Trim Amplifier". | ||
catalog calls it a "Gain Trim Amplifier". It comes in a 12 lead TO-8 package | It comes in a 12 lead TO-8 package and is used in the vertical amplifiers of the 400 MHz and 500 MHz scopes from the [[7000 series scopes|7000 series]]. | ||
and is used in the vertical amplifiers of the 400 MHz and 500 MHz scopes from the [[7000 series scopes|7000 series]]. | |||
The final vertical gain adjustment is after this amplifier and it typically | The final vertical gain adjustment is after this amplifier and it typically leads into either a [[155-0064-00]] or [[155-0065-00]] | ||
leads into either a [[155-0064-00]] or [[155-0065-00]] output amplifier which | output amplifier which drives the vertical deflection plates of the CRT. | ||
drives the vertical deflection plates of the CRT. | |||
==Repair issues== | ==Repair issues== | ||
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Note that this IC can fail by becoming non-linear. It will continue to amplify but | Note that this IC can fail by becoming non-linear. It will continue to amplify but | ||
will show non-linear gain and clipping when using a step calibrator. | will show non-linear gain and clipping when using a step calibrator. | ||
According to [http://hakanh.com/dl/docs/kitinstructions/050-0650-00.pdf Modification 050-0650-00, Vertical Output Microcircuit Replacement], the emitter resistors need to be selected according to a code printed on the device. | |||
==Used in== | ==Used in== | ||
* [[7834]], [[7844]], [[7854]] (A18U50) | * [[7834]], [[7844]], [[7854]] (A18U50) | ||
* [[7904]], [[ | * [[7904]], [[R7903]] (U685) | ||
* [[R7912]], [[7912AD]] | |||
[[Category:Tektronix-made integrated circuits]] | [[Category:Tektronix-made integrated circuits]] | ||