SKA6516

The SKA6516  (P/N 151-0367-00) is an NPN Transistor. Note: possibly incomplete info, service manuals to be checked.

Zenwizard Studios found thirteen of these in a 475 and thirteen of those tested as having a parasitic reverse diode junction.

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.

How to identify this transistor

It's not very hard to identify these transistors. They will have a 151-367 number on them and when tested will show a reverse polarity protection diode, which should not be there. These typically have a 100% failure rate so you should replace them with the recommended transistor listed in the "Suitable Modern Replacements" section.

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.

Key Specifications

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Pictures

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  Circuit equivalent of failed transistor

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