2SB555-R Toshiba Original Transistors TO-3 High Power output HFE pretested For Sale

2SB555-R Toshiba Original Transistors TO-3 High Power output HFE pretested


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2SB555-R Toshiba Original Transistors TO-3 High Power output HFE pretested:
$8

2SB555-R Toshiba Original Transistors TO-3 High Power output
These Transistors are NEW old stock, clean never used.Now all transistors and none RF FET's get HFE-Gain test using Tektronix.Free shipping to lower 48 US mainland states only

Aside from Mechanical parts the
followings are my policies regarding all semiconductors:

1) The only transistor testers I accept result from are those that have been verified by transistor (semiconductor) manufacturers.
2) The transistor testers have been recommended to authorized service centers in the past or recently by Audio, TV, and like manufacturers.
3) The transistor testers are fully capable of switching off (mute) base current to reduce unnecessary physical disconnect related spike at the base.
4) I reserve the right to request a clear picture be presented of the bench setup, instrument used, and gloves and grounding of the workbench as well as isolation of bench power.

Note: HFE/hfe (gain) and operating f specification have overtime changed as device manufacturers found different method of manufacturing such as epitaxial manufacturing process. Nevertheless many other power transistors originating from this era (1970~1985) cannot be assumed to have great high-frequency performance and there can be variation of open-loop gain and other specification when compared to modern transistors. Modern successors to early transistors (1970~1980) can be much more suitable in fast-switching circuits or high-end audio power amplifiers which enabled us to design amplifiers with specification of 15Hz~40Khz compared to older amplifiers 20Hz~20KHz. Why buy old transistors then. The group of transistors that work along the defective transistor you about to replace also originated about the same period. It simplifies job!. The reason is too long for this note.



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