Dynascan B&K 667 User manual
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
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Calibration
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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
leakage
be
the
rejection
criteria.
‘Vhis
is
a
reading
of
110
on
the
bottom
meter
scale.
If
the
operating
impedance
of
the
tube
in
its
circuit
is
low,
the
anount
of
grid
leakage
is
not
nearly
as
critical
as
in
applications
such
as
RF
amplifiers,
1F
amplifiers,
etc.,
where
any
grid
leakage
is
cause
for
rejec-
tion.
This
should
be
taken
into
consideration
by
the
operator
before
reject-
ing
a
tube.
CALIBRATION
INSTRUCTIONS
The
sensitivity
of
the
leakage
test
circuit
in
the
Model
667
is
adjusted
at
the
factorv
so
that
a
leakage
of
100
megohms
just
reads
in
the
GRID
EMISSION—REJECT
area
of
the
meter
scale.
Should
this
sensitivity
control
require
readjustment,
proceed
in
the
fol-
lowing
manner:
1.)
Remove
main
panel
from
case,
after
removing
screws
from
panel
and
center
of
bottom
of
carrying
case.
(Between
molded
feet)
2.)
Place
a
100
megohm
resistor
in
tube
socket
#6
between
pin
1
and
9.
3.)
Rotate
SELECTOR
switch
to
position
#1.
4.)
Depress
the
LEAKAGE
pushbutton
and
observe
the
meter.
Adjust
the
white
trimpot
on
the
P.C.
board
adjacent
to
the
meter
until
the
meter
pointer
reads
at
the
division
of
the
GREEN
and
the
GRID
I
MISSION—REJECT
sections
of
the
scale.
The
shorts
test
circuit
is
factory
adjusted
to
a
sensitivity
of
one
megohm.,
Should
this
circuit
require
readjusting,
proceed
in
the
following
manner.
1.)
Remove
main
panel
from
case
as
above.
2.)
Place
a
one
megohm
resistor
in
tube
socket
#6
between
pin
1]
and
9.
3.)
Rotate
the
SELECTOR
switch
to
position
#1.
4.)
While
observing
the
SHORTS
light,
adjust
the
blue
trimmer
po-
tentiometer
on
the
P.C.
board
until
the
SHORTS
light
just
barely
glows.
5.)
Reassemble
tester.
12
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