HISTORIC TRANSISTOR HOBBYIST SUPPLIES!
Supplies for the Transistor Historian and Kit Builder.
Only from the TransistorMuseum™
Philco was an early
manufacturer of transistors, starting in 1953/54, with the famous Surface
Barrier Type (SBT). This used a
unique electrochemical etching process during manufacture that allowed for
an extremely thin germanium base layer, which in turn allowed the
transistor to operate at very high frequencies (20 to 30 MHZ). Philco sold millions of these
transistors in the 1950s, which were used in high speed digital computer
circuits and high frequency radio circuits. Improvements to the SBT technology lead to even higher
performing MAT and MADT transistors.
Philco continued to be the main
supplier, while Sprague became a major second source of virtually identical
Your Surface Barrier Transistor
Order Will be Supplied in the Storage/Display Envelope Shown Above, which Includes
an Insert with Historical Description and a Schematic.
SURFACE BARRIER & MADT TRANSISTORS
Surface Barrier & MADT
Radio & Computer
Order Will Contain:
Tested 2N128/588 PNP
Germanium Surface Barrier/MADT
the Style Shown Above)
Insert Depicting the Historical Importance of this Classic Transistor,
Includes a Schematic and Project Description of an Early Transistor Project
Using the Surface Barrier Transistor
and Display Envelope
$10 per Package (Two Transistors)
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COPYRIGHT © 2002
By Jack Ward