Dynascan B&K 667 Manuel utilisateur

INSTRUCTION

MANUAL

FOR

Model

667

SOLID

STATE

TUBE

TESTER

& K

DIVISION

DYNASCAN

CORPORATION

1801

West

Belle

Plaine

Avenue

Chicago,

Illinois

60613

TABLE

CONTENTS

Page

Brief

Description

Model

667

Solid

State

Tube

Tester

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

Summary

Haw

Use

The

667

Solid

State

Tube

Tester

...........

4,5

Specifications

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MODEL

667

SOLID

STATE

TUBE

TESTER

BRIEF

DESCRIPTION

MODEL

667

SOLID

STATE

TUBE

TESTER

The

B&K

Model

667

versatile,

up-to-date,

completely

solid

state,

portable

tube

tester

that

will

test

all

tubes

commonly

used

today’s

elec-

tronic

industry,

including

many

foreign

tube

types.

The

following

tests

are

made

each

tube:

1.)

Shorts

and

leakage

between

any

element

and

all

other

elements,

with

sensitivity

megohm.

Because

exclusive

“multiple

lockout

switch”

all

modern

tubes

which

have

than

one

connected

the

same

element

can

still

completely

tested

for

shorts

from

cach

element

every

other

element.

2.)

Quality

checked

test

circuit

that

determines

the

full

capability

cathode

emission

under

current

loads

and

voltages

simulating

actual

operating

conditions.

Grid

emission,

gas,

grid

contamination,

obscure

grid

cathode

leakage

are

all

disclosed

exceptionally

sensitive

grid

current

check.

This

test

will

indicate

with

less

than

microampere

grid

current.

‘Phis

tester

incorporates

the

casy-to-use

lockout

pushbuttons

increase

testing

capability

and

prevent

obsolescence

and

special

tube

chart

display

holder

facilitate

rapid,

error-[ree

testing.

The

tester

housed

highly

attractive,

weatherproof,

very

durable,

VIP/Attache-type

carrying

case.

SUMMARY

HOW

USE

THE

667

SOLID

STATE

TUBE

TESTER

10.

1].

Look

tube

chart.

Rotate

HEATER

voltage

switch

“A”

indicated

setting.

Insert

tube

indicated

socket.

Depress

RESET

pushbutton

“B”.

Depress

LOCKOUT

switches

“C”

indicated.

Set

LOAD

switch

“D”

position

indicated.

Actuate

(depress)

POWER

switch

“E”.

test

for

all

shorts:

Rotate

SELECTOR

switch

“F”,

pausing

each

its

twelve

positions,

and

observe

SHORTS

Lamp

“G”.

steady

glowing

the

SHORTS

Lamp

any

position

switch

cause

for

rejection

the

tube.

(Momentary

flashes

between

positions

are

ignored).

;

light

tapping

the

tube

with

the

finger

tip

while

rotating

for

shorts

will

help

locate

intermittent

shorts.

Never

tap

with

screwdriver

other

hard

object,

this

does

not

constitute

valid

test

and

may

cause

damage

the

tube.

Certain

types

video

amplifier

tubes

with

high

15,000

such

12HG7,

6GN7,

and

others,

should

not

tapped

all.

Tapping

these

Frame

Grid

tubes

may

cause

grid

short.

Set

SELECTOR

switch

position

indicated.

Depress

LEAKAGE

button

“H”.

deflection

the

meter

pointer

into

the

GRID

EMISSION—REJECT

area

the

top

scale

“J”

cause

for

rejection

the

tube.

Depress

QUALITY

button

“K’’.

Observe

test

results

the

GOOD-

BAD

scale

the

meter

“L’’.

This

completes

the

test.

Turn

tester

power

off

releasing

the

POWER

pushbutton.

CAUTION

Always

set

the

heater

switch

the

correct

filament

voltage

position

before

inserting

the

tube

the

socket.

Failure

observe

this

precaution

may

result

burning

out

the

filament

the

tube.

POMurnre

weer

etry

SPECIFICATIONS—MODEL

667

Type

Tests:

Cathode

Emission,

Shorts,

Grid

Emission

and

Gas

Test

Capabilities

and

Method:

Tests

all

commonly

encountered

tubes

plus

many

special

and

in-

dustrial

types.

Multiple

filament

voltages,

loads

and

lockouts

provided.

F.E.T.

solid

state

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:

Multiple

lockout

pushbuttons.permit-rapidly

opening

any

desired

combination

tube

connections.

Reset

button

clears

all

lockouts

simultaneously.

Case:

Portable

attache-type

constructed

black,

weatherproof,

durable

molded

plastic.

Size:

10”

13”

514”

thick,

including

cover

Input

Power:

117

VAC

continuous

duty.

intermittent

duty

Actual

Weight:

lbs.

DESCRIPTION

667

TESTER

Basic

Test

Connections

Used

Detecting

Shorts

and

leakages

one

megohm

are

indicated

neon

SHORTS

light.

The

SELECTOR

switch

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

Tube

Element

Connections

Made

Shorts/Leakage

Test

Preventing

Misleading

Shorts

Indications

Lockout

Switching

figure

the

schematic

for

6KG6

21KQ6

tube

shown

(both

popular

horizontal

deflection

amplifier

types).

The

control

grid

has

two

connections

(1,

8),

the

screen

grid

has

two

connections

(3,

and

the

suppressor

grid

also

has

two

connections

(2,

7).

normal

tube

tester

without

multiple

lockout

switches,

the

SHORTS

lamp

would

glow

positions

2, 3, 6

and

the

chart

would

have

say

“normally

shows

short

positions

7”.

using

the

lockout

switch

open

pins

and

short

the

tube

between

screen

grid

and

suppressor

will

now

show

positions

and

the

Selector

switch.

Without

the

multiple

lockouts—this

short

would

undetected!

Through

the

use

this

lockout

technique

know

that

any

time

the

SHORTS

lamp

glows,

there

definitely

SHORTS

defect

the

tube.

FIGURE

Checking

for

shorts

between

Suppressor

Grid

and

all

other

elements,

Pins

6, 7,

and

are

locked

out

Testing

Tubes

for

Quality

The

test

for

the

quality

tube

comprehensive

cathode

emission

test.

important

test

the

tube

under

load

condition

which

will

in-

sure

that

tube

passing

this

test

will

have

adequate

emission

properly

operate

circuit.

One

number

different

voltage-load

resistor

com-

binations

selected

offer

the

most

appropriate

test

for

particular

tube

type.

The

resultant

cathode

current

measured

sensitive

solid

state

amplifier

and

quantitative

reading

obtained

the

meter

(See

Figure

3).

The

meter

divided

into

three

sections:

Bad-Questionable-Good,

al-

lowing

fast

and

accurate

determination

the

tube’s

quality.

SELECTED

VOLTAGE

Sane

;

SELECTED

D.C.

AMP

MES

METER

RESISTOR

FIGURE

Cathode

Emission

Test

Testing

Tubes

for

Grid

Emission

and

Gas

Vhe

Grid

Emission

and

Gas

‘Test

valuable

aid

‘TV

servicing

because

quickly

picks

out

those

tubes

which

can

cause

trouble

a.g.c.,

syne,

LF.

amplifier,

and

R.I*.

tuner

circuits.

order

understand

how

tube

can

have

“grid

emission”

and

“gas

current”

must

look

into

the

theory

electron

tubes.

There

normally

some

gradual

evaporation

the

electron

emitting

material

which

the

tube

manufacturer

applics

the

cathode.

Some

this

vaporized

material

tends

deposit

the

grid

and

gives

rise

what

known

“grid

emission”,

where

the

grid

itself

emits

electrons

and

draws

current

commonly

known

“negative

grid

current”.

The

flow

this

“negative

grid

current”

can

followed

Figure

FIGURE

Negative

Grid

Current

The

electrons

flow

from

the

grid

the

plate

then

back

through

the

power

supply

the

grid

leak

resistor

and

the

grid

again.

Notice

that

the

voltage

drop

across

the

grid

leak

resistor

such

that

causes

the

grid

positive

than

normally

would

with

grid

emission.

shght

amount

“gas”

present

tube,

some

the

electrons

from

the

cathode

will

collide

with

molecules

the gas

and

may

knock

off

one

electrons,

leaving

positive

ions

(ionization).

Some

these

pos-

tive

ions

may

then

strike

the

grid,

taking

electron

from

the

grid

form

gas

molecule

again.

The

electron

flow

this

“gas

current”

the

same

direction

the

“grid

emission

current”

and

can

traced

Figure

Notice

again

that

the

grid

made

positive

this

“gas

current’.

achieve

sensitive

grid

emission

gas

test,

the

circuit

shown

Figure

5 is

employed.

SOLID

STATE

uae

D.C.

AMP

METER

{11

FIGURE

Grid

Emission

Gas

Test

The

tube

under

test

has

its

normal

plate

voltage

applied

with

the

grid

biased

beyond

cutoff.

This

bias

applied

the

tube

under

test

through

the

8.2

megohm

resistor

which

also

the

input

resistor

the

solid

state

D.C.

amplifier.

The

amplifier

biased

that

cutoff

unless

the

tube

gaseous

its

grid

contaminated

with

some

the

cathode

coating.

Then

current

will

flow

from

grid

plate

the

tube

through

the

8.2

meg-

ohm

resistor.

This

produces

voltage

across

the

resistor

which

amplified

the

solid

state

D.C.

Amp,

causing

deflection

the

meter.

The

meter

marked

“grid

emission”

and

divided

into

two

parts

for

this

test,

the

reject

area

being

above

10%

deflection

and

the

good

area

below.

meter

deflection

10%

equivalent

leakage

100

megohms.

NOTE:

Some

tube

manufacturers

recommend

that

Megohms

grid

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