36,230
edits
No edit summary |
No edit summary |
||
(9 intermediate revisions by 3 users not shown) | |||
Line 1: | Line 1: | ||
{{Monolithic IC | |||
catalog calls it a "Gain Trim Amplifier". It | |Manufacturer=Tektronix | ||
the | |Model=M077A | ||
|Part_nos=155-0059-00 | |||
|Description=HF amplifier | |||
|an=an | |||
|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]]. | |||
Note that this IC can fail by becoming non-linear. It will continue to amplify but | 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. | ||
will show non-linear gain and clipping when using a step calibrator. | |||
==Repair issues== | |||
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. | |||
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. | |||
==Used in== | ==Used in== | ||
* [[7834]] | * [[7834]] | ||
* [[7904]], [[ | * [[7844]] (U1685, U2685) | ||
* [[7854]] (A18U50) | |||
* [[7904]], [[R7903]] (U685) | |||
* [[R7912]], [[7912AD]] (A34U685) | |||
==Datasheet== | |||
* [[Media:Tek 155-0059-00.pdf|Tektronix 155-0059-00 Datasheet (PDF)]] | |||
[[Category:Tektronix-made integrated circuits]] | [[Category:Tektronix-made monolithic integrated circuits]] |