155-0078-00
The 155-0078-xx (M084) is a Tek-made broadband vertical amplifier integrated circuit in a minipac package. The input and output are differential. The 155-0078 and its test fixture was designed by John Addis for the 485 scope (Note 1), which uses no less than 18 of these chips in various grades.
The rise time of each M84 was tested using the 25ps Push-Pull Pulse Generator, and parts were binned and were given part numbers with an appropriate speed suffix. Each M84 was also tested for DC characteristics such as balance.
| SUFFIX | SPEED | DC CHARACTERISTICS | REPLACEABLE BY |
|---|---|---|---|
| 00 | Fast | Best | ---- |
| 01 | Fast | Third best | -03,-00 |
| 02 | Fast | Most relaxed | -01,-03,-00 |
| 03 | Fast | Second best | -00 |
| 04 | Slow | Same as -00 | -00 |
| 05 | Slow | Same as -01 | -03,-00,-07,-04 |
| 06 | Slow | Same as -02 | -01,-03,-00,-05,-07,-04 |
| 07 | Slow | Same as -03 | -00,-04 |
| 10 | Fast | Best | ---- |
| 11 | Fast | Third best | -13,-10 |
| 12 | Fast | Most relaxed | -11,-13,-10 |
| 13 | Fast | Second best | -10 |
| Sometimes an instrument will contain a better grade of part than called for in the manual.
The manual should be consulted for the correct replacement type. | |||
The M84 also comes in 14-pin DIP, as 155-0273-00 and 155-0274-00 (slower grade).
Pictures
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Excerpt from 067-0587-01 schematic, showing application of 155-0078-00.
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155-0078-01 amplifiers in 7A26. Note symmetric layout.
Used in
- 475 (U140, U240, U450)
- 485
- 7834, 7844 (U415,U515)
- 7854 (A13U520,A13U590,A13U620,A13U680)
- 7904, 7903 (U5510,U5530,U5550,U5610,U5630,U5650)
- 7912AD, 7912HB
- 7A16A
- 7A16P (U60240, U60340, U60440, U60540)
- 7A24, 7A26 (U1350,U1450,U1550,U1750,U2350,U2450,U2550,U2750)
- 7A42 (A5U1010,A5U1020,A5U1040,A5U1060)
- 067-0587-01
- AM503
- PG502 (U360, -06)
- DC510 (A12U1311, A12U1331, -10)
Notes
- Note 1: See John Addis quote in 7A11 article