Western electric 409 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION ABL6.L;.O9A
Transmission Engineering and Date Issue 1, May, 1948
AT&TCO Standard
Elem be 9 ADVANCE ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC (SASS/409A ELECTRON TUBE
3..
- 7 MAX.
I
BASS/4O
cogEROL-
G ' M IN IAT U R I
. CATHODE PENTOD =
p x I 1/5": 3/32"
§ < MEasURED AT
. 5 2 7/I6 DlA.ON BULB
I'ale 1'"
1
H EATER
HEATER
. U H 57-1 RMA PROPOSED STANDARD
MINIATURE 7-PIN BUTTON BASE
§L§§SIFICATIDN
The SASS/409A electron tube is a 7-pia miniature, triple-grid pentode with an indirectly heated cathode.
It is intended for low pover applications at high and ultra-high frequencies. The usual control-grid and
the suppressor-grid can be used as independent control elements. The tube is suitable for use in
gated amplifiers, gain controlled amplifiers, delay circuits, and mixers.
[OUNTINQ
The dimensions and arrangement of terminal connections are as shown above. The tube may be
mounted in any position.
W
Heater voltage, we or d-o 6.3 volts
Nominal heater current 0.175 ampere
i - ts a
Plate voltage 180 volts
Screen voltage 0 volts
Pasitive suppressor voltage 27 volts
Plate dissipation 1.7 watts
Screen dissipation 0.75 watt
Cathode current 1.8 ailhaaperes
Heater-cathode voltage 50 volts
Bulb temperature lZOCantisrede
OPEATING CONDITIONS AND CMACI'ERlfiTlCS
Plate voltage 120 120 volts
Screen voltage 120 120 volts
Suppressor voltage - 3 0 volts
Grid voltage - 2 - 2 volts
Plate current 3.6 5:2 ailliemperes
. Screen current 4.8 3.5 millianperes
Trensconductance. control-grid 1850 3200 umhoa
, Transconductanoe. suppresor-grid 810 470 umhoe
CONIEOLGBID' PLATE 00MB": CHLOEE CHARAQIEISIIQS SH P E 0 -G C N U -0 A l I S
Plate voltage 120 volts Plate voltage 120 120 volts
~ Screen voltage 120 volts Screen voltage 120 60 volts
Suppressor voltage 0 volts Grid voltage - 2 0 volts
Nominal cut-off, control-grid - 6 volts Nominal cut-off, suppressor-grid -l0 - 8 volts
. Guaranteed cut-off, control-grid -lO volts Guaranteed cut-off, suppressor-grid -lS -lO volts
INTERELECKRODE CAPACITANCES (With JAN l'A No. 314 shield connected to cathode)
Control-grid to heater. cathode, screen
and suppressor- grid 3.9 MM
Plate to control-grid 0.01 unf
Plate to heater, cathode,
screen and suppressor-3nd 3.0 not
Control-grid to suppressor-grid 0.1 not