Sencore TF151 - Test Jacks and Connections; Transistor Chart Columns Explained

ON-OFF Switch. Co ntr ols the AC power to the TF151 and glows in the ON position
to act as a pilot light.
TEST JACKS
SOURCE/E: mack lead connects to the emitter of a regular transistor or to the
source of a field effect transistor.
GATE liB: Yellow lead connects to the base of a regular transistor or to the
gate of a field e ffect transistor.
DRAIN/C : Red lead connects to the collector of a regular transistor, or to
the drain of a field effect transistor.
GATE 2: Blue l ead connects to the second gate of a dual gate field effect
transistor .
USING
THE SENCORE FET AND TRANSISTOR REFERENCE BOOK
The Transistor Referenc e Book supplied with the TFl51 is a unique book, listing
more transistor and field e ffect transistor than any other one ' source of information
in the field. Th e Transistor Reference Book is in three parts; regular transistor
listings, field effect transistor listings, and manufacturers part numbers. Tlle tran-
sistor section has the field e ffect transistor numbers in the same listing. If you don't
know if it is a regular (bi -polar) transistor or FET, the book will tell you. If it is a
regular transistor, the information will follow the transistor number. If it is an
FET, you will be told to look under the FET section of the book. The manufacturers
part numbers will be list ed under the manufacturers name. The manufacturers are
listed alphabetically in the back section of th e book. Figure 1 shows a section of the
regular transistor chart.
•
TRANSISTOR I
2N2440
2N2443
2N2444
2H2445
I
2 3.
LO PW
N=NPN
P=
PNP
HI PW
PM
SPEC'L
OA
RF d
NS
NS
V PG
V PG
4.
BASE
DIAG
32
32
500
56
5.
GAIN (BETA)
-------
MIN. AVE. MAX.
50
75
20
185
120
60
Figure 1.
SECTION OF TRANSISTOR CHART
6 .
LEAKAGE
leBO
MAX uA
. 001
. 01
ISO
200
1. TRANSISTOR column indicates the transistor numb er or manufacturers part
number.
2. This column indicates the proper test position of th e function switch. Tlle
check mark ·. (./) indicates a high power transistor and the function switch
should be set to the HI POWER position. The asterisk (*) indicates that the
transistor is a special R F type and that th e SPECIAL R F check should be used .
No
mark indicates that the transistor is 10 power and the LO POWER check
on the TF151 should be used.
3. The POL / MAT column te lls the polarity and the material of the transistor.
The type switch should be set to NPN when the lett er N is indicated and PNP
when the letter P is indicated. The G stands for germanium material a nd S
for silicon. This is handy when selecting a replacement type such as a general
replacement line transistor.
6