TABLE XVI

EELECTRICAL CONSTANTS FOR VARIOUS TYPES OF VACUUM TUBES

CODE NO. PRINCIPLE USES CLASSIFICATION CATHODE OR HEATING UNIT VOLTAGES & CURRENTS OF PLATE & GRIDS u Rp
(OHMS)
POWER OUTPUT (WATTS) MAX SAFE Eb MICROPHONIC NOISE (DB BELOW 10-5 WATTS)
If or Ih (Amperes) Ef or Eh (Volts) Eb (Volts) Ec (Volts) Es (Volts) Ib (Mils) Is (Mils)
101-D C, M, R, T F-3 0.97 4.4 130 -9.0 - 8.0 - 5.9 6,000 .06 160  
101-F C, M, T F-3 0.485 4.0 130 -8.0 - 7.0 - 6.5 6,000 .06 160 19
102-D or G C, M, P, R, S, T F-3 0.97 2.0 130 -1.5 - 0.75 - 30 60,000 .0042 160 30
102-F C, M, T, S F-3 0.485 2.0 130 -1.5 - 0.75 - 30 60,000 .042 160 20
104-D C, M, T F-3 0.97 4.4 130 -22.5 - 20.0 - 2.5 2,300 .17 160  
205-D
205-E
C, P, R
P
F-3
F-3
1.60
1.60
4.5
4.5
350
130
-22.5
-9.0
- 33.0
5.0
- 7.0
6.8
3,500
6,600
.07
.89
350
350
25
25
215-A R, M F-3 0.25 1.0 67.5 -6.0 - 1.0 - 6.0 18,000 .008 100 27
245-A C H-4-Sc 1.60 2.0 180 -1.5 45 5.1 1.4 170 220,000 .025 200 29
246-A R F-4-Sc 0.10 3.4 135 -1.5 45 1.5 0.2 285 725,000 .028 180  
259-A C, R H-4-Sc 1.60 2.0 180 -1.5 75 5.5 1.2 550 400,000 .05 200 20
281-A C F-4-Co 1.60 5.0 150 -60.0 70 35.0 0.7 5.0 3,500 2.20 170  
285-A P, R H-5-P 1.60 2.0 180 -12.0 150 9.0 1.6 130 145,000 .65 200 20
310-A C, P H-5-P 0.32 10.0 180 -3.0 135 5.4 1.2 1800 40,000 .34 250  
311-A C H-5-P 0.64 10.0 155 -16.0 155 40.0 3.5 85 30,000 1.80 250  
328-A C, P H-5-P 0.425 7.5 180 -3.0 135 5.4 2.2 1800 40,000 .34 250  
Code for "Principal Use"
C = Carrier
M = Measuring apparatus
P = Public address & Program Pickup
R = Radio transmitters & receivers
S = Signalling apparatus
T = Telephone repeaters
Code for "Classification"
F = Filament type cathode
H = Heater type cathode
3, 4, 5 Designate number of electrodes
Sc = Screen grid tube
Co = Coplanar grid tube
P = Pentode

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Taken from

Principles of Electricity
applied to
Telephone and Telegraph Work

L.L. Dept. AT&T Co.
1938 Edition
(Reprinted with corrections January, 1941)