tabulation of data on receiving tubes

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taken from the library. SK» TABULATION OF DATA ON RECEIVING TUBES A111QM 023b?B Handbook 103 United States Department of Commerce —QG— 1 . 1151 //103 1967 National Bureau of Standards

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Page 1: Tabulation of data on receiving tubes

taken from the library.

SK» TABULATION OF DATA ON

RECEIVING TUBES

A111QM 023b?B

Handbook 103

United States Department of Commerce

—QG— 1

. 1151 //103 1967

National Bureau of Standards

Page 2: Tabulation of data on receiving tubes
Page 3: Tabulation of data on receiving tubes

UNITED STATES DEPARTMENT OF COMMERCE • Alexander B. Trowbridge, Secretary

NATIONAL BUREAU OF STANDARDS • A. V. Astin, Director

Tabulation of Data on

Receiving Tubes

J. K. Moffitt

The National Bureau of Standards

Electron Devices Data Service

National Bureau of Standards Handbook 103

Issued September 29, 1967

Supersedes Handbook 83

For sale by the Superintendent of Documents, U.S. Government Printing Office

Washington, D.C. 20402 - Price $1.25

Page 4: Tabulation of data on receiving tubes

Library of Congress Catalog Card Number: 67-62081

Page 5: Tabulation of data on receiving tubes

Foreword

This tabulation of data on receiving tubes currently in use has been prepared as part of

the National Bureau of Standards Electron Devices Data Service. Established in 1948 to pro¬

vide technical data on radio tubes to members of the Bureau staff, the service has since been

extended to other scientists in government and in industry. In the course of the program, a

large volume of information on domestic and foreign tubes has been accumulated on punched

cards from which it could be automatically printed. It was felt desirable to make these data

available in a single reference source as an aid to circuit designers in selecting tube types for

particular uses.

The engineer should find this manual useful in narrowing down the choice of tubes to one or a

few types. However, it is not practical to give all possible operating conditions nor to provide

the characteristic curves for each tube in a tabulation such as this. It will still be necessary to

consult the tube manufacturer’s literature for such detailed information.

All information appearing in this publication was taken from manufacturers’ published

specifications and every effort has been made to ensure accuracy and completeness. However,

the Bureau cannot assume responsibility for omissions nor for results obtained with these data.

Additional NBS prepared tabulations which are also available include the following: “Tab¬

ulation of Data on Microwave Tubes” NBS Handbook 104 (1967), which represents a listing

of foreign and domestic microwave tubes; “Tabulation of Data on Microwave Diodes”, “Tab¬

ulation of Data on Microwave Tubes”, “Tabulation of Data on Space—Charge Tubes”,

published in the 1964 & 1965 editions of “Microwave Engineers Handbook and Buyers Guide”,

“Tabulation of Published Data on Soviet Electron Devices Through June 1965”, NBS Technical

Note 265, and “Electron Tube Interchangeability Chart” (published by Electronic Industries,

1962).

ill

Page 6: Tabulation of data on receiving tubes

Contents

Page

Foreword_ in

1. Introduction_ 1

2. Organization of the tabulation_ 1

3. Sorting and terminology of the tabulation_ 2

3.1. Sorting methods_ 2

3.2. Terminology_ 2

3.3. Unit symbols_ 4

4. Numerical listing of data on receiving tubes_ 5

5. Characteristic listing of data on receiving tubes_ 60

6. List of similar types of receiving tubes_ 115

7. EIA basing connections_ 126

IV

Page 7: Tabulation of data on receiving tubes

Tabulation of Data on Receiving Tubes

A tabulation of Receiving-Type Electron Tubes with some characteristics of each type has been prepared in the form of two major listings, a Numerical Listing in which the tubes are arranged by type number, and a Characteristic Listing in which the tubes are arranged by tube type and further ordered on the basis of one or two important parameters. The tabulation is accompanied by a listing of similar tube types and basing connections for the listed tubes.

1. Introduction

The Electron Devices Section of the National Bureau of Standards has developed over the past several years an Electron Devices Data Service. This service attempts to obtain and maintain a file of data on all electron devices, i.e., tubes, transistors, and semiconductor diodes, manufac¬ tured in the United States and other countries. In an effort to make this service more readily available to engineers applying electronics in laboratories throughout the country, it was decided to develop a method of tabulating the essential information on these devices in handbook form for ready reference. For this publication on Receiving Tubes, an easily decipherable code and format for the tube characteristics was developed which would be suitable for a punched card system allowing automatic transfer to the printed page. The sources of information were the manufacturers’ published handbooks and data sheets. The accuracy of the printed infor¬ mation is reasonably assured by verifying tabula¬ tions, by various sortings, and cross checking with manufacturers’ publications.

This tabulation includes only the information normally furnished by the manufacturers in their handbooks or data sheets, and includes those tubes generally known as “Receiving Tubes.” These include tubes to be found in home entertain¬ ment devices, military equipment, general purpose electronic laboratory equipment, etc.

One further restriction is that the tubes are currently active types, most of which have been registered with EIA and are produced by foreign or United States manufacturers. These tubes appear in the manufacturers’ “New Equipment Price Lists” or are those on which a new or revised data sheet has been issued since 1960. Types listed by manufacturers as “For Replace¬ ment Only” or as “Discontinued” types are tabulated only in the Numerical Listing.

The user of this tabulation should be reminded that industry has used various letter suffixes to designate improved versions of a tube type. For example the letter “W” indicates that the type has been improved for military end-use and “WA” and/or “WB” indicate further improve¬

ments. Thus the “6AL5W” is an improved version of the “6AL5” and this is continued to the ultimate improved type designation “5726/ 6AL5W”.

To avoid these complex designations, this tabulation lists only the type numbers by which a type is most commonly designated. The user should be cautioned that these versions of a tube may not be bilaterally interchangeable as the improved versions may differ in some physical dimensions or in one or more electrical charac¬ teristics.

2. Organization of the Tabulation

The Receiving Tube Tabulation comprises four principal sections as follows:

1. Numerical Listing. In this, the tubes are arranged by type number in the numerical- alphabetical sequence which is standard in the industry.

2. Characteristics Listing. Here the current tubes are grouped according to the number of electrodes, and within the group they are arranged by increasing value of one or two pertinent characteristics.

3. Similar Tube Types. Following each tube listed is one or more types similar to it. Here are found those tubes from sections 1 and 2 which are coded as having similar types available, together with some older tubes not included in sections 1 and 2 but which are similar to a current listed tube.

Tubes which are identical in all respects except heater ratings, e.g., 3BE6, 4BE6, 12BE6, etc, have been omitted from the similar tubes list since they are obviously similar types and may be found by turning to the characteristics listing where they will be found in a group or in close proximity to one another.

L Electronic Industries Association (EIA) Base Connections. This section shows the base connec¬ tions in tabular form for the EIA Base Numbers shown in the Numerical and Characteristic List¬ ings. This tabular form contains all the informa¬ tion shown in the normal basing diagram and specifically indicates the use for each base pin. Initial confusion at this method of display will be more than compensated by the ready applicability

1

Page 8: Tabulation of data on receiving tubes

of the specific information contained in this tabular form.

The format has column headings of the base pin numbers up to twelve and one column for a top cap or external connection. Under these head¬ ings, is printed the symbol for the tube element or elements corresponding to the pin number for each base number. The code for the symbols is shown below:

H Heater F Filament HCT Heater Center Tap FCT Filament Center Tap K Cathode Gl, G2, etc. Grid Number P Plate D Deflector T Target IC Internal Connection IS Internal Shield SH Shell, Sleeve, etc.

A prefix number is used before the code letter to indicate the section number of the tube (e.g., the two sections in a twin triode) and a postfixed number to indicate the number of the element in a section. In those cases in which an element is common to more than one section, no prefixed number is used (e.g., a single common screen grid, G2 in a twin pentode).

A blank in the column of a pin number indicates that there is no pin in the base or that the pin has no internal or external connection.

3. Sorting and Terminology of the Tabulation

To assist the user in understanding and apply¬ ing the tabulation, the method of sorting and the definition of terms and abbreviations are explained in this section.

3.1. Sorting Methods

The Numerical Listing is arranged in numerical- alphabetical sequence by tube type number. In the Characteristics Listing the tubes are arranged in 45 groups by tube structure. Within these groups the tubes are arranged according to increas¬ ing value of one or two important parameters and finally by tube type number.

Given below are the groups into which the tubes are arranged and the characteristics by which the tubes are sorted within a group, e.g., all of the single triodes are grouped together, and are arranged in order of increasing value of “n” Where two or more tubes have the same n, these are then arranged by increasing value of “gm” Tubes with identical values of both n and gm are then sorted by type number.

Group heading Characteristics sorted on

Primary Secondary Tertiary

1. Regulator, Single Diode, Cold Cathode.

2. Regulator, Single Diode, Fila- rEb*_ lb*_ Type No. mentary Cathode.

3. Rectifier, Single Diode, Cold Cathode.

4. Rectifier, Single Diode, Fila¬ mentary Type. 'EpX*_ lb Type No.

Type No.

Type No.

Type No.

5. Rectifier, Single Diode, Heater Type.

6. Damper, Single Diode_ 7. Diode, Twin, Cold Cathode_ 8. Diode, Twin, Filamentary Type.. 9. Diode, Twin, Heater Type _ ■Eps. lb

10. Diode, Multiple__ 11. Diode with Triode_ 12. Diode, Twin, with Triode_ 13. Diode with Tetrode _

lb_

15. Diode with Pentode.. 16. Triode, Single___ 17. Triode, Twin__ 18. Triode, Dual Dissimilar _ 19. Triode, Triple..... 20. Triode with Diode_ 21. Triode with Tetrode_ jn- gm-

22. Triode with Beam Type_ 23. Triode with Pentode.... 24. Triode with Hexode.. 25. Triode with Pentagrid.... 26. Tetrode, Single .. 27. Tetrode, Twin_ 28. Tetrode with Diode _ [gm.. Type No..

29. Tetrode with Triode_ 30. Beam, Single _ 31. Beam, Twin_____ 32. Beam, Miscellaneous... 33. Beam with Triode..... 34. Pentode, Single .... _ . gm.. Type No. 35. Pentode, Twin_ 36. Pentode, Dissimilar _ 37. Pentode with Diode.... 38. Pentode with Triode . _ 39. Pentagrid, Single... Igm- fp- . Type No. 40. Pentagrid with Triode_ 41. Hexode, Single _

1

'gm- Type No.. 42. Hexode with Triode _ 43. Thyratron, Triode Type_ 44. Thyratron, Tetrode Type. 45. Indicator, Electron Ray..

j-Epx-.-

Eb.

Ib.

Ib..

Type No.

Type No.

*Eb and Ep, used for sorting are the maximum values, lb is the typical value.

3.2. Terminology

The Numerical and Characteristic Listings are in tabular form containing 22 columns. The headings of these columns and their meanings are given below.

A blank in any column indicates that the char¬ acteristic designated by the column is not appli¬ cable to the tube in question or that no value was given in the available data.

Definitions

Type Number. This column lists the numerical- alphabetical designation assigned to the tube type by the manufacturer.

Code. A letter “S” indicates that this tube is similar to some other type. Such a tube will be found in the Similar Tubes List on pages 115 through 125 with its similar types. It is to be noted that these tubes are similar, not necessarily equivalent or directly interchangeable.

A star (^) in this column indicates that the tube is on the Military Preferred List issued by the Department of Defense as “Military Standard

2

Page 9: Tabulation of data on receiving tubes

Electron Tubes; Selection and use of,” MIL- STD-200H, 17 January 1966.

A plus sign (+) is used to designate a tube not on the Military Preferred List but which the manufacturer refers to as a ruggedized, reliable, or premium type.

In the Numerical List the letters “OBS” have been used to indicate that these tube types were not found on any manufacturers current price list and are thus considered as “replacement only” types and as such should not be considered in the design of new equipment. These will not appear in the Characteristics Listing but have been included in the Numerical List for reference only.

Kind. An easily decipherable three-letter symbol is used here showing the tube to be a diode, triode, beam pentode, etc.

BEA Beam DIO Diode DWD Double Diode GTB Gated Beam HEX Hexode PDD Pentode—Diode PND Pentode PTG Pentagrid SHB Sheet Beam TDI Triode Dissimilar TET Tetrode TRD Triple Diode TRI Triode TRT Triple Triode TTR Twin Triode TWP Twin Pentode

Type. A three-letter symbol is used to amplify the characterization under “Kind.” Thus a tube is designated as single, twin, or combined with some other type in a multiple structure, in one envelope.

No'Te: A tube containing two or more different structures in one envelope will be listed once for each such structure in the Numerical Listing and once in each appropriate group in the Character¬ istic Listing, e.g., the 6X8 is listed as a triode with a pentode section and also as a pentode with a triode section. The data given on any one line refers to the section of the tube as designated in the column headed “Kind.”

DIO With Diode DIS Dissimilar (as applied to Dual

Triodes) DSD Dissimilar with Diode DTR With Dissimilar Dual Triode DWD With Double Diode GTB With Gated Beam PDD With Pentode—Diode PND With Pentode QUA Quadruple SIN Single-Type SXD Sextuple TDI With Triode Dissimilar TET With Tetrode TRD With Triple Diode

TRI With Triode TTR With Twin Triodes TWN Twin Type

Bulb. Designates the type, size, and shape of the bulb by an alphabetical-numerical code defined as follows: A. Initial Letter

MT—Metal Tubular or Cylindrical Shape S—Indicates the “ST” design, i.e., the domed- conical-body glass bulb

T—Glass tubular or cylindrical shape B. Number—this number multiplied by one-

eight 00 inch gives the bulb diameter. Only the whole number is used, thus a T6K bulb is designated T6.

. Descriptive terms are used for the following ACO Acorn Design CM Ceramic-Metal Design LIT Lighthouse Design PEN Pencil Design

Use. Gives the application for which the tube was developed or is most useful as stated in the manufacturer’s data sheet. If a tube is particularly suited to some band of frequencies such as audio, intermediate, very high, etc., it is so designated in this column by AFA, IFA, VHF, etc. Such designation is the only reference to the frequency of operation of tubes in this Tabulation.

AFA Audiofrequency amplifier AFD Audiofrequency Driver CA Cascode Amplifier CH Television Color Control CON Converter DA Damper DET Detector DIS Discriminator EL Electrometer GA Gating Amplifier GEN General Purpose GGA Grounded Grid Amplifier HDA Horizontal Deflection Amplifier HDO Horizontal Deflection Oscillator HF High Fidelity IFA Intermediate-frequency Ampli¬

fier IND Indicator (Electron Ray) MIX Mixer ONA On-Off Applications (Computer

Service) osc Oscillator PA Power Amplifier REC Rectifier REF Voltage Reference REG Voltage Regulator RFA Radio Frequency Amplifier SEM Secondary Emission Tube THY Thyratron TRG Trigger UHF Ultra-high Frequency Amplifier VA Voltage Amplifier

3

Page 10: Tabulation of data on receiving tubes

VDA Vertical Deflection Amplifier VDO Vertical Deflection Oscillator VHF Very-high Frequency Amplifier

Char. Refers to a specific characteristic of the given tube.

GAS Gas-filled (as applied to rectifiers, regulators, etc.)

HIP High Perveance RCO Remote Cutoff i.e., more than 17 V SCO Sharp Cutoff i.e., 7 volts or less SRC Semi-remote Cutoff i.e., more than

7 V but less than 17 V VAC Vacuum (as applied to rectifiers)

Reg. Indicates the manufacturer who registered the type with the EIA. In some cases a manufac¬ turer may no longer make a tube which he regis¬ tered but it was impractical to try to list all companies making a given tube type so the present system was adopted as being fair to all manufacturers.

The not equal sign (=^) is the symbol used to indicate that the original registrant is no longer producing receiving tubes, but the type is cur¬ rently being manufactured by another company or companies.

AE Associated Electrical Industries AM Amperex Electronic Corp. BE Bendix Electron Tube Products CG Canadian General Electric Co. Ltd. CH Chatham Electronics Cl Compagnie Industrielle Francaise GE General Electric Co. HI Hitachi Ltd. HY CBS Hytron LR Standard Elektrik Lorenz MT Matsushita Electronics Corp. MU Mullard Ltd. NN New Nippon Electric Co. NU National Union Electric Corp. PL Philco (Lansdale) RA Raytheon Co. RC Radio Corporation of America RE Rogers Electronic Tubes Ltd. RV Radio Valve Co. Ltd. SH Siemens & Halske SO Sonotone Corp. ST Standard Telephones & Cables Ltd. SY Sylvania Electric Products, Inc. TE Telefunken G.M.B.H. TO Tokyo Shibaura Electric Co. Ltd.

(Toshiba) TS Tungsol Electric Inc. VI Victoreen Instrument Co. WE Western Electric Co., Inc. WH Westinghouse Electric Corp.

K type

C Cold Cathode F Filamentary Cathode H Heater type (i.e., unipotent.ial

cathode)

Ef. Specifies the nominal heater or filament voltage in volts. In the case of tubes whose heater or filament is center tapped to allow series or parallel operation of the sections, the value given is for series connection.

If. Typical heater or filament current in milli- amperes.

Max. Eb or Epx. Maximum plate voltage per¬ missible in the tube. In the case of diodes and thyratrons the value is the peak inverse voltage which can be applied to the tube.

Max. Ib. Maximum plate current in milliam- peres which the tube may pass.

Pp. Maximum plate dissipation of the tube in watts. In the case of twin tubes the dissipation is for one section only, e.g., the 6SN7GTB is listed at a dissipation of 5 W. The manufacturer gives this as the value for each plate, but with both units operating the total for both plates must not exceed 7.5 W. For this reason multiple tubes should be checked in the manufacturer’s data before operating the tube with maximum dissipation in each section.

Eb. Typical value for the d-c plate or operating voltage in volts.

Ib. Typical d-c anode current in milliamperes for the operating voltage in the preceding column.

Gm. Typical value of grid-plate transconduct¬ ance of the tube in micromhos.

fi. Typical tube amplification factor. rp. Typical value for plate resistance in ohms. Capacity in: Typical value for input capacitance of

the tube, i.e., between grid #1 and all other electrodes. Capacity out: Typical value for the output

capacitance of the tube, i.e., between the anode and all other electrodes.

Note: These capacity values are measured with¬ out an external, grounded shield.

EIA Base No. This column designates the number assigned by the EIA to the base connec¬ tions of the tube. These Base Numbers will be found in the last section of the Tabulation begin¬ ning on page 126. The designation “FL” is used to indicate flexible or flying leads on the miniature or subminiature tubes. The column is left blank where no Base Number is applicable as in lighthouse and ceramic-metal tubes.

3.3. Unit Symbols

While the normally used electrical unit is printed at the top of each column, it will be noted that letter symbols are used following some numbers to indicate a change of unit.

Symbol Column heading Uni

K _ Max Eb or Ep*_ Kilovolts. Microamperes. u____ Max Ib and Ib__

A_ Max Ib and Ib- - - . Amperes. K Kilohms. M_ Megohms.

The assistance of Mr. Leroy M. Allison in programming this publication is gratefully ac¬ knowledged.

4

Page 11: Tabulation of data on receiving tubes

4. Numerical Listing of

Data on Receiving Tubes

Page 12: Tabulation of data on receiving tubes

TU

BE

kin

d

TU

BE

K

typical

MA

XIM

UM

plate

TY

PIC

AI

rhA

RA

rT

FR

IS

Tin

S_C

AP

AC

IT

AN

CE

EIA

TY

PE

CO

DE

TY

PE

US

F

RE

G

FIL

AM

EN

T

CH

AR

AC

TE

RIS

TIC

S

EB

IB

GM

MU

RP

PIC

OF

AR

AD

S

BA

SE

NU

MB

ER

BU

LB

CH

AR

TY

PE

V

| M

A

V

1 M

AW

V

MA

UM

HO

OH

MS_

IN

| O

UT

NO

. O 3 O 3 O 3 3 cc -<i > oo <t n < < a in kt 'T kj in kj- kt

O _J _l _» Q LlLU L D O CM CM o rs.

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3 2^ x cr CD CD CG O _l O O <t >0 >0 ro o ro ro 'O

o _J »— h- > O L < O <

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d d a: o: 3 < < < < IE •O nO -O O 'O

O O O O >o m co m

CD CD CD CD CD in TJ CD CD CVJ in r-*

CD CD CD cd o in

CD CD in cc

GOO kj m o

rl <1 rW hn rv C\i <o >c

CD CD in in

G CD in o

o o o CM CO O

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ri in in ® O in cm o o »-t CM ri

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3 3 3 G G G r- G |X G in n o

3 3 G CM M- CM G in in CM CM

in in in g g o g cm n ro co co o ro CM

CC G in G in G CD >0 0 CM tH cm in o

CM

g in g o co o

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GGGGG G G G G ro 'T o ro ro ro -r o

CM

c wc tih o cMn in in in w in in h tr xr

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3 <T C G vH

G 'T «H ro

G G

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0 3 0 0 0

O <X <X <X cc cr in cr a:

CO (/)</) CO C/) < < < < < CD CD CD CD CD

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CM

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6

1U

5 H

A

S

PN

H

DIO

T 5

AF

A

SC

O

XN

U

F

1,4

50

90

3

68

2

60 0

600K

68W

1U

6

PT

C-

SIN

T5

CO

N

SY

F

1.4

25

110

4

90

60

0U

50

OK

2.0

0

6.5

0

7C

D

IV?

mo

SIN

T 6

RE

C

VA

C

RC

F 0.6

300

8K

10

25

500U

0.8

0

9U

1X

2 A

S

DIO

SIN

T 6

RE

C

VA

C

XH

Y

F

1,2

200

20K

11

14K

17

5U

1.8

0

9Y

1X

?B

S

DIO

SIN

T 6

RE

C

VA

C

SY

F

1.2

20

0

22K

45_

18

K

10

0U_

1.0

1)

9Y

Page 13: Tabulation of data on receiving tubes

NU

ME

RIC

AL

LIS

TIN

G

- C

ON

TIN

UF

D

7

Page 14: Tabulation of data on receiving tubes

8

Page 15: Tabulation of data on receiving tubes

NU

ME

RIC

AL

LIS

TIN

G

- -C

ON

TIN

UE

D

9

Page 16: Tabulation of data on receiving tubes

NU

ME

RIC

AL

LIS

TIN

G

- C

ON

TIN

UE

D

10

Page 17: Tabulation of data on receiving tubes

NU

ME

RIC

AL

LIS

TIN

G

- C

ON

TIN

UE

D

tl

Page 18: Tabulation of data on receiving tubes

NU

ME

RIC

AL

LIS

TIN

Q

- C

ON

TIN

UE

D

12

Page 19: Tabulation of data on receiving tubes

TU

BE

KIN

D

TU

BE

K

TY

PIC

AL

MA

XIM

UM

PL

AT

E

TY

PIC

AL

CH

AR

AC

TE

RIS

TIC

S

CA

PA

CIT

AN

CE

EIA

T

YP

E

CO

DE

TY

PE

US

E

RE

G

FIL

AM

EN

T

CH

AR

AC

TE

R I S

T I

CS

ER

TF

1

GM

Tm

iJI

RP

PIC

6F

AB

AC

S

BA

SE

N

UM

BE

R

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Page 90: Tabulation of data on receiving tubes

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Page 91: Tabulation of data on receiving tubes

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Page 92: Tabulation of data on receiving tubes

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Page 93: Tabulation of data on receiving tubes

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Page 94: Tabulation of data on receiving tubes

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Page 95: Tabulation of data on receiving tubes

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Page 96: Tabulation of data on receiving tubes

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Page 97: Tabulation of data on receiving tubes

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Page 98: Tabulation of data on receiving tubes

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Page 99: Tabulation of data on receiving tubes

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94

Page 101: Tabulation of data on receiving tubes

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Page 102: Tabulation of data on receiving tubes

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96

Page 103: Tabulation of data on receiving tubes

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97

Page 104: Tabulation of data on receiving tubes

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Page 105: Tabulation of data on receiving tubes

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Page 106: Tabulation of data on receiving tubes

180

Page 107: Tabulation of data on receiving tubes

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101

Page 108: Tabulation of data on receiving tubes

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Page 109: Tabulation of data on receiving tubes

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103

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Page 111: Tabulation of data on receiving tubes

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Page 112: Tabulation of data on receiving tubes

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< (/) • •—<3 0 LU X Z

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r^ ro ro

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Page 113: Tabulation of data on receiving tubes

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Page 115: Tabulation of data on receiving tubes

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109

Page 116: Tabulation of data on receiving tubes

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110

Page 117: Tabulation of data on receiving tubes

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111

Page 118: Tabulation of data on receiving tubes

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Page 119: Tabulation of data on receiving tubes

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Page 120: Tabulation of data on receiving tubes

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114

Page 121: Tabulation of data on receiving tubes

6. List of Similar Types

of Receiving Tubes

115

Page 122: Tabulation of data on receiving tubes

list

or

sim

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tyres

or

receiv

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tubes

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LP LT\ CP LTv iP ^ 5C it it >- CDU C d U. ro ro ro ro 10

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fO PO ro ro <o

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<y IV.

IT* X <X C\J X CY' «*

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pj x •o

ro < o ro

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CD C/3 X ro

ip ip ip IP > I X >- LLli L. L. ro ro ro ro

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cc C/3 X ^ 'T 'T ro > > o

ro ro ro

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ip ip IP ip cc 3t x x x co I LL) LL X I ro ro ro ro ro

ip ip cp x co Z i: < U ^3 I X I “3 C5 ro ro ro ro ro

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x x

it -y x »- PJ CY

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ro O Pj cc 2 Z D <3 X X X X ro ro ro ro ro

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ip ip ip ip cc ip 3^ O >- 3c: (/3 <3 Li Li L. C C X ro ro ro ro ro ro

LP CP 'O CD o it x x c/3 r— XXXI X ro ro ro ro ro

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ip CD ro ■o

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CP LP IP iP C/3 it >- (/3 X CD X X PJ PJ Pi PJ

IP LP iP iP IP it X CD C2> X CT X X X X C\J PJ CY CY CY

<3 <3

pj ro ^y cy ro <1 <1 < X X o o o o o

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CP cD <r 2 o ro ro C Cl !C J

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ro X lP 3 >- <3 <3 O X X PJ PJ PJ CY CY

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CP CP CP LP IP X CO O >- it X X X X X CY CY PJ CY PJ

116

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Page 144: Tabulation of data on receiving tubes
Page 145: Tabulation of data on receiving tubes

THE NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards1 provides measurement and technical information services

essential to the efficiency and effectiveness of the work of the Nation’s scientists and engineers. The

Bureau serves also as a focal point in the Federal Government for assuring maximum application of

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2 Located at Boulder, Colorado, 80302.

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