155-0059-00: Difference between revisions

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The '''Tektronix 155-0059-00''' (M077A) is a Tek-made HF amplifier chip, designed by [[Thor Hallen]].  The Tek custom chip catalog calls it a "Gain Trim Amplifier".   
{{Monolithic IC
|Manufacturer=Tektronix
|Model=M077A
|Part_nos=155-0059-00
|Description=HF amplifier
|Used_in=7834;7844;7854;7904;R7903;R7912;7912AD
|Designers=Thor Hallen
}}, designed by [[Thor Hallen]].  The Tek custom chip catalog calls it a "Gain Trim Amplifier".   
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]].
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]].


The final vertical gain adjustment is after this amplifier and it typically leads into either a [[155-0064-00]] or [[155-0065-00]]  
The final vertical gain adjustment is after this amplifier and it typically leads into either a [[155-0064-00]] or [[155-0065-00]] output amplifier which drives the vertical deflection plates of the CRT.
output amplifier which drives the vertical deflection plates of the CRT.


==Repair issues==
==Repair issues==


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 HF Amplifier Replacement], the emitter resistors need to be selected according to a code printed on the device.
According to [http://hakanh.com/dl/docs/kitinstructions/050-0650-00.pdf Modification 050-0650-00, Vertical HF Amplifier Replacement], the emitter resistors need to be selected according to a code printed on the device.

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