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INSTRUCTION

MANUAL

FOR

Model

667

SOLID

STATE

TUBE

TESTER

B

& K

DIVISION

OF

DYNASCAN

CORPORATION

1801

West

Belle

Plaine

Avenue

Chicago,

Illinois

60613

TABLE

OF

CONTENTS

Page

Brief

Description

of

Model

667

Solid

State

Tube

Tester

............

3

Summary

of

Haw

To

Use

The

667

Solid

State

Tube

Tester

...........

4,5

Specifications

2.00...

......

000008.

Ie

cieR

EIAs

iawn

Gin

Gehan’ Gonads

GaRewAR

o

6

Equipment

Description

........0

0.6.00

cee

ec

eee

eee

ee

7,

8,9,

10,

11

Calibration

TWiStFuctiOns

24.

2

nyse

Fens

aon

es

ae

ime

ss oe

pa

ees

exenes

12

MODEL

667

SOLID

STATE

TUBE

TESTER

BRIEF

DESCRIPTION

OF

MODEL

667

SOLID

STATE

TUBE

TESTER

The

B&K

Model

667

is

a

versatile,

up-to-date,

completely

solid

state,

portable

tube

tester

that

will

test

all

tubes

commonly

used

in

today’s

elec-

tronic

industry,

including

many

foreign

tube

types.

The

following

tests

are

made

on

each

tube:

1.)

Shorts

and

leakage

between

any

element

and

all

other

elements,

with

a

sensitivity

of

1

megohm.

Because

of

exclusive

“multiple

lockout

switch”

all

modern

tubes

which

have

more

than

one

pin

connected

to

the

same

element

can

still

be

completely

tested

for

shorts

from

cach

element

to

every

other

element.

2.)

Quality

is

checked

in

a

test

circuit

that

determines

the

full

capability

of

cathode

emission

under

current

loads

and

voltages

simulating

actual

operating

conditions.

Grid

emission,

gas,

grid

contamination,

or

obscure

grid

to

cathode

leakage

are

all

disclosed

by

an

exceptionally

sensitive

grid

current

check.

This

test

will

indicate

with

less

than

1

microampere

of

grid

current.

‘Phis

tester

incorporates

the

casy-to-use

lockout

pushbuttons

to

increase

testing

capability

and

prevent

obsolescence

and

a

special

tube

chart

display

holder

to

facilitate

rapid,

error-[ree

testing.

The

tester

is

housed

in

a

highly

attractive,

weatherproof,

very

durable,

VIP/Attache-type

carrying

case.

SUMMARY

OF

HOW

TO

USE

THE

667

SOLID

STATE

TUBE

TESTER

eo

a

2

oF

A

gL

10.

1].

12

Look

up

tube

in

chart.

Rotate

HEATER

voltage

switch

“A”

to

indicated

setting.

Insert

tube

in

indicated

socket.

Depress

RESET

pushbutton

“B”.

Depress

LOCKOUT

switches

“C”

as

indicated.

Set

LOAD

switch

“D”

to

position

indicated.

Actuate

(depress)

POWER

switch

“E”.

To

test

for

all

shorts:

Rotate

SELECTOR

switch

“F”,

pausing

in

each

of

its

twelve

positions,

and

observe

SHORTS

Lamp

“G”.

A

steady

glowing

of

the

SHORTS

Lamp

on

any

position

of

switch

is

cause

for

rejection

of

the

tube.

(Momentary

flashes

between

positions

are

to

be

ignored).

;

A

light

tapping

of

the

tube

with

the

finger

tip

while

rotating

for

shorts

will

help

to

locate

intermittent

shorts.

Never

tap

with

a

screwdriver

or

other

hard

object,

as

this

does

not

constitute

a

valid

test

and

may

cause

damage

to

the

tube.

Certain

types

of

video

amplifier

tubes

with

high

Gm

of

15,000

or

more

such

as

12HG7,

6GN7,

and

others,

should

not

be

tapped

at

all.

Tapping

of

these

Frame

Grid

tubes

may

cause

a

grid

short.

Set

SELECTOR

switch

to

position

indicated.

Depress

LEAKAGE

button

“H”.

A

deflection

of

the

meter

pointer

into

the

GRID

EMISSION—REJECT

area

of

the

top

scale

“J”

is

cause

for

rejection

of

the

tube.

Depress

QUALITY

button

“K’’.

Observe

test

results

on

the

GOOD-

BAD

scale

of

the

meter

“L’’.

This

completes

the

test.

Turn

tester

power

off

by

releasing

the

POWER

pushbutton.

CAUTION

Always

set

the

heater

switch

to

the

correct

filament

voltage

position

before

inserting

the

tube

in

the

socket.

Failure

to

observe

this

precaution

may

result

in

burning

out

the

filament

of

the

tube.

4

POMurnre

weer

etry

SPECIFICATIONS—MODEL

667

Type

of

Tests:

Cathode

Emission,

Shorts,

Grid

Emission

and

Gas

Test

Capabilities

and

Method:

a.

Tests

all

commonly

encountered

tubes

plus

many

special

and

in-

dustrial

types.

b.

Multiple

filament

voltages,

loads

and

lockouts

provided.

c.

F.E.T.

solid

state

DC

amplifier

drives

precision

meter.

Short

Sensitivity:

|

Megohm

Short

Indicator:

Neon

Bulb

Grid

Leakage

Sensitivity:

100

Megohms

Grid

Leakage

Indicator:

High

input

impedance

F.E.T.

amplifier

drives

meter.

Special

Features:

a.

Multiple

lockout

pushbuttons.permit-rapidly

opening

any

desired

combination

of

tube

pin

connections.

|

b.

Reset

button

clears

all

lockouts

simultaneously.

Case:

Portable

attache-type

constructed

of

black,

weatherproof,

durable

molded

plastic.

Size:

10”

x

13”

x

514”

thick,

including

cover

Input

Power:

117

VAC

60

Hz

continuous

duty.

.

50

Hz

intermittent

duty

Actual

Weight:

6

lbs.

DESCRIPTION

OF

667

TESTER

Basic

Test

Connections

Used

in

Detecting

Shorts

Shorts

and

leakages

to

one

megohm

are

indicated

by

a

neon

SHORTS

light.

The

SELECTOR

switch

is

rotated

through

all

twelve

positions,

selecting

one

element

and

shorting

all

others

together

(See

Fig.

1).

1A.

Plate

Selected

1B.

Cathode

Selected

1C.

Control

Grid

Selected

1D.

Screen

Grid

Selected

1E.

Suppressor

Grid

Selected

IF.

Heater

Selected

FIGURE

1.

Tube

Element

Connections

Made

in

Shorts/Leakage

Test

Preventing

Misleading

Shorts

Indications

by

Lockout

Switching

In

figure

2,

the

schematic

for

a

6KG6

or

21KQ6

tube

is

shown

(both

popular

horizontal

deflection

amplifier

types).

The

control

grid

has

two

connections

(1,

8),

the

screen

grid

has

two

connections

(3,

6)

and

the

7

suppressor

grid

also

has

two

connections

(2,

7).

On

a

normal

tube

tester

without

multiple

lockout

switches,

the

SHORTS

lamp

would

glow

in

positions

2, 3, 6

and

7

and

the

chart

would

have

to

say

“normally

shows

short

in

positions

2,

3,

6,

7”.

By

using

the

lockout

switch

we

open

pins

6,

7

and

8.

A

short

in

the

tube

between

screen

grid

and

suppressor

will

now

show

up

in

positions

2

and

3

of

the

Selector

switch.

Without

the

multiple

lockouts—this

short

would

go

undetected!

Through

the

use

of

this

lockout

technique

we

know

that

any

time

the

SHORTS

lamp

glows,

there

is

definitely

a

SHORTS

defect

in

the

tube.

FIGURE

2.

Checking

for

shorts

between

Suppressor

Grid

and

all

other

elements,

Pins

6, 7,

and

8

are

locked

out

Testing

Tubes

for

Quality

The

test

for

the

quality

of

a

tube

is

a

comprehensive

cathode

emission

test.

It

is

important

to

test

the

tube

under

a

load

condition

which

will

in-

sure

that

a

tube

passing

this

test

will

have

adequate

emission

to

properly

operate

in

a

circuit.

One

of

a

number

of

different

voltage-load

resistor

com-

binations

is

selected

to

offer

the

most

appropriate

test

for

a

particular

tube

type.

The

resultant

cathode

current

is

measured

by

a

sensitive

solid

state

amplifier

and

a

quantitative

reading

is

obtained

on

the

meter

(See

Figure

3).

The

meter

is

divided

into

three

sections:

Bad-Questionable-Good,

al-

lowing

a

fast

and

accurate

determination

of

the

tube’s

quality.

8

SELECTED

VOLTAGE

Sane

;

SELECTED

D.C.

AMP

MES

ee

METER

RESISTOR

NN

FIGURE

3.

Cathode

Emission

Test

Testing

Tubes

for

Grid

Emission

and

Gas

Vhe

Grid

Emission

and

Gas

‘Test

is

a

valuable

aid

in

‘TV

servicing

because

it

quickly

picks

out

those

tubes

which

can

cause

trouble

in

a.g.c.,

syne,

LF.

amplifier,

and

R.I*.

tuner

circuits.

In

order

to

understand

how

a

tube

can

have

“grid

emission”

and

“gas

current”

we

must

look

into

the

theory

of

electron

tubes.

There

is

normally

some

gradual

evaporation

of

the

electron

emitting

material

which

the

tube

manufacturer

applics

to

the

cathode.

Some

of

this

vaporized

material

tends

to

deposit

on

the

grid

and

gives

rise

to

what

is

known

as

“grid

emission”,

where

the

grid

itself

emits

electrons

and

draws

current

commonly

known

as

“negative

grid

current”.

The

flow

of

this

“negative

grid

current”

can

be

followed

in

Figure

4.

||

-

+

FIGURE

4.

Negative

Grid

Current

9

The

electrons

flow

from

the

grid

to

the

plate

then

back

through

the

power

supply

to

the

grid

leak

resistor

Rg

and

up

to

the

grid

again.

Notice

that

the

voltage

drop

across

the

grid

leak

resistor

Rg

is

such

that

it

causes

the

grid

to

go

more

positive

than

it

normally

would

with

no

grid

emission.

If

a

shght

amount

of

“gas”

is

present

in

a

tube,

some

of

the

electrons

from

the

cathode

will

collide

with

molecules

of

the gas

and

may

knock

off

one

or

more

electrons,

leaving

positive

ions

(ionization).

Some

of

these

pos-

tive

ions

may

then

strike

the

grid,

taking

an

electron

from

the

grid

to

form

a

gas

molecule

again.

The

electron

flow

of

this

“gas

current”

is

in

the

same

direction

as

the

“grid

emission

current”

and

can

be

traced

on

Figure

4.

Notice

again

that

the

grid

is

made

more

positive

by

this

“gas

current’.

To

achieve

a

sensitive

grid

emission

or

gas

test,

the

circuit

shown

in

Figure

5 is

employed.

"|

==

SOLID

STATE

uae

D.C.

AMP

METER

j

N

{11

+

FIGURE

5.

Grid

Emission

&

Gas

Test

The

tube

under

test

has

its

normal

plate

voltage

applied

with

the

grid

biased

beyond

cutoff.

This

bias

is

applied

to

the

tube

under

test

through

the

8.2

megohm

resistor

which

is

also

the

input

resistor

of

the

solid

state

D.C.

amplifier.

The

DC

amplifier

is

biased

so

that

it

is

cutoff

unless

the

tube

is

gaseous

or

its

grid

contaminated

with

some

of

the

cathode

coating.

Then

current

will

flow

from

grid

to

plate

of

the

tube

through

the

8.2

meg-

ohm

resistor.

This

produces

a

voltage

across

the

resistor

which

is

amplified

by

the

solid

state

D.C.

Amp,

causing

a

deflection

of

the

meter.

The

meter

is

marked

“grid

emission”

and

is

divided

into

two

parts

for

this

test,

the

reject

area

being

above

10%

deflection

and

the

good

area

below.

A

meter

deflection

of

10%

is

equivalent

to

a

leakage

of

100

megohms.

NOTE:

Some

tube

manufacturers

recommend

that

10

Megohms

of

grid

10