SKA6516
The SKA6516 (P/N 151-0367-00) is an NPN Transistor. Note: possibly incomplete info, service manuals to be checked.
Key Specifications
- please add
Zenwizard Studios found thirteen of these in a 475 and thirteen of those tested as having a parasitic reverse diode junction.
The "parasitic diode" is very likely an artifact created by simple transistor testers, see the thread at https://groups.io/g/TekScopes/topic/101335545#201002
A list of eighteen has been extracted from the Service Manual and is shared on the 475 Repairs page.
Suitable Modern Replacement
The 475 Service manual lists some of the transistors with alternatives, and some without - so I'd be careful to check that some need to be closer in spec than others.
In his video, Mr ZenWizard Studios used Fairchild/On Semi KSP10BU from Mouser. Farnell has them, too.
In the 1982 Common Design Parts catalog, -0367 is Cross referenced as AST3571 which appears to be a custom 2N3571.
Pinout
The pinout of this transistor does not correlate with most modern BJTs. With the flat part facing you, from left to right, the pin is collector, base, and emitter. Incorrectly inserting a modern replacement thinking that it follows a standard emitter base collector can potentially bring down the equipment.
Pictures
Used in
Some instruments using part SKA6516
| Instrument | Manufacturer | Class | Model | Description | Introduced |
|---|---|---|---|---|---|
| 465 | Tektronix | Oscilloscope | 465 | Portable 100 MHz dual-trace scope | 1972 |
| 465B | Tektronix | Oscilloscope | 465B | Portable 100 MHz dual-trace scope | 1980 |
| 466 | Tektronix | Oscilloscope | 466 | Portable 100 MHz dual-trace storage scope | 1974 |
| 475 | Tektronix | Oscilloscope | 475 | Portable 200 MHz dual-trace scope | 1972 |