155-0059-00: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
(7 intermediate revisions by 2 users not shown)
Line 1: Line 1:
The '''155-0059-00''' is a Tek-made HF Amplifier chip.  The Tek custom chip
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".   
catalog calls it a "Gain Trim Amplifier".  It's a 12 lead TO-8 package.  Used in
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 7000 series 400 MHz and 500 MHz scopes in the vertical amplifier section.
 
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==


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.


==Used in==
==Used in==


* [[7834]], [[7844]], [[7854]] (A18U50)
* [[7834]]
* [[7904]], [[7903]]
* [[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]]

Revision as of 13:23, 13 June 2020

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". 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.

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.

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 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

Datasheet