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Патент USA US2111711

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March 22, 1938.
2,111,711
J. VAN SLQOTEN
COMBINATION RADIO RECEIVER AND PHONOGRAPH
Filed March 4, 1936
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INVENTOR
.J. VAN SLOOTEN
BY
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ATTORNEY
2,111,711
Patented Mar. 22, 1938
PATENT OFFICE
UNITED > STATES
2,111,711
COMBINATION RADIO‘ RECEIVER. AND
PHONOGRAPH
Jacob van- Slooten, Eindhoven, Netherlands, as- .
signor to N. V. Philips’ Gloeilampenfabrieken,
Eindhoven, Netherlands
Application March 4, 1936; Serial No. 67,004‘
In Germany March 18, 1935
7 Claims.
(01. 179-10011)
This invention relates to a radio receiving set
which is adapted at the same time for reproduc
ing talking machine records. With such sets
it is known when reproducing records to insert
5 the pick-up in the input circuit of the detector
tube which exclusively operates as a low fre
quency ampli?er in this case. After that the
ampli?ed voltages are ampli?ed again in a nor—
mal manner by the further low frequency
19 amplifying part of the set ‘and supplied to the
loudspeaker. In many cases, however, this meth
od of changing-over, which is simple and assures
sutlicient sound-strength is’ not feasible, for in
according to the invention which is relevant to
the latter.
'
‘
When receiving radio signals the high or inter
mediate frequency oscillations are supplied be
tween the grid 18 and the cathode 19 of a
screened-grid tube I. Through the switch ‘I,
which bears on the left contact during radio
reception, the screen-grid I1 is connected to a
point of positive voltage, for instance to the posi
tive terminal of the supply, so that the resistance
5 is short-circuited.
0
The anode is connected to
the positive pole of the supply through a tuned
circuit It. The ampli?ed voltages are supplied
stance when the detector valve is a diode. In
15 these cases it would be possible of course, to
to the detector circuit through a coupling con
denser 9. The detector circuit comprises a diode
interpose the pick-up in the input circuit of the
low frequency amplifying part of the sets. It
2, a resistance 1 l, whose function will be set out
hereinafter, and a potentiometer resistance 12,
has been found, that in this case the sound
from which low frequency voltages are taken off
through a contact I3 by the adjustment of which
the sound strength can be controlled. The re 20
sistance H may be connected in series with a
strength is insufficient when reproducing the
record, so that it is necessary to interpose either
an ampli?er or a transformer, which is expensive.
As an alternative the pick-up may be inserted
in the input circuit of the last high- or inter
a low frequency ampli?er in this case. When
making use of diode recti?cation the diode de
tector tube may then be made inoperative dur
voltages are supplied to the output Valve 3 in
whose output circuit a‘ transformer 14 may be in
serted, whose secondary ‘winding is connected to
It will be obvious
that the changing-over arrangement becomes
fairly complicated in this way.
The object of the present invention is to pro
vide a circuit arrangement in which one of the
high- or intermediate frequency tubes is adapted
40
4 UT
I0 is designed for carrying off the high- or inter
mediate frequency voltages. The low frequency
_ denser should be enlarged.
03 U
high frequency choking coil 20. The condenser
mediate frequency tube which should operate as
ing the reproduction of records, since it con
stitutes a short-circuit for the low frequency
30 currents, and when, as is customary, a tuned cir
cuit is inserted in the output. circuit of the tube,
this tuned circuit should be replaced by a cou
pling resistance. Moreover, the coupling con
in a simple manner for low frequency ampli?ca
tion when reproducing records.
According to the invention the screen grid of
the said tube is used as an anode when records
are reproduced. For this purpose a coupling
resistance is inserted‘ in the screen-grid circuit,
the screen-grid being connected to the input cir
cuit of the low frequency amplifying part of the
set through a coupling condenser.
It has been
50 found that in this manner a suf?cient preliminary
ampli?cation of the low frequency currents can
be achieved.
'
The invention will be more clearly, understood
by reference to the accompanying drawing repre
55 senting by way of example, that part of the set
5
the loudspeaker 15.
.When changing over from the reception of
radio signals to record-reproduction by chang
ing over the switch 6, the pick-up 4 is inserted in
the input circuit of the tube 1. At the same
time the commutator ‘i is changed over thus con
tacting with the right contact, the resistance 5
being inserted in the screen-grid circuit. In this
case the tube I operates as a low frequency ampli
?er, the screen-grid ll serving as an anode. The
low frequency. voltages are supplied to the re
sistance 12 through the coupling condenser 8.
The resistance ll prevents the low frequency
voltages from ?ow off through the diode.
I claim:
5
1. In amplifying apparatus, an ampli?er in- '
cluding an electronic tube having an anode, a
cathode, a signal grid and an auxiliary electrode,
a high frequency input circuit for the tube con
nected between the control grid and cathode
thereof, a low frequency input circuit and switch
ing means for connecting the low frequency input 50
circuit between the control grid‘and cathode of
the tube, a high frequency output circuit for the
tube connected between the anode and cathode
thereof, a low frequency output circuit and
switching means for connecting the low-fre 55
2
2,111,711
quency output circuit between the auxiliary elec
trode and the cathode of the tube.
2. In amplifying apparatus, an ampli?er in
cluding an electronic tube having an anode, a
cathode, a control grid and an auxiliary electrode,
a high frequency input circuit for said tube
connected between the control grid and the
cathode, a high frequency output circuit for said
tube connected between the anode and the oath
10 ode, a detector connected in the output circuit
of said electronic tube, and an audio frequency
ampli?er connected to the detector, a low fre
quency circuit and switching means for connect
ing the low frequency circuit between the con
trol grid and cathode of the ?rst tube, and means
including a switching device for connecting the
auxiliary electrode of the ?rst named tube to the
ing device also being adapted to short-circuit
the resistance connected between the auxiliary
electrode and the positive terminal of the source
of space current, an audio frequency ampli?er
including a control electrode, a cathode and an
anode, and means including a condenser for con
necting the control electrode to a point of that
one of said two mentioned resistors between the
anode and cathode of the diode which is nearest
the cathode.
10
5. In amplifying apparatus, a high frequency
ampli?er circuit including an electronic tube hav
ing an anode, a cathode, a signal grid and an
auxiliary electrode, external circuits for said tube
forming a signal grid-cathode circuit, an auxilia
ry electrode-cathode circuit and an anode-cath
ode circuit, a low frequency ampli?er provided
audio frequency ampli?er.
with an input circuit and an output circuit, a
3. In a radio phonograph system, a high fre
quency ampli?er including a space discharge de
vice having an anode, a cathode, a control grid
and auxiliary electrode, a diode detector con
nected between the anode and cathode of said
space discharge device, an audio frequency ampli
?er connected to the diode output, a phonograph
pick-up means and means including a switch for
detector interposed between the anode-cathode
circuit of said electronic tube and the input of 20
the low frequency ampli?er, a low frequency cir
cuit including a photograph pickup device, switch
ing means for connecting the low frequency cir
connecting the phonograph pick-up means be
tween the control grid and cathode of the ?rst
named tube, and switching means for changing
the characteristics of the ?rst named tube so that
the auxiliary electrode acts as an anode with re
spect to the control grid and cathode, and to
connect the auxiliary electrode to the audio‘ fre~
quency ampli?er when the ?rst named tube is
adjusted to act as an ampli?er for phonograph
signals.
4. In a radio phonograph device, an ampli?er
including a space discharge device provided with
an anode, a cathode, a signal grid and an auxil
iary electrode, a high frequency input circuit
connected between the signal grid and the oath
ode, a low frequency input circuit including the
phonograph pick-up device and a switching means
for connecting said low frequency input circuit
between the signal grid and the cathode of said
cuit to the signal grid-cathode circuit of said
electronic tube, and switching means for con 25
necting said auxiliary electrode-cathode circuit
of said electronic tube directly to the input of
said low frequency ampli?er when the low fre
quency circuit is switched into the signal grid
cathode circuit of said electronic tube.
30
6. An arrangement as described in claim 5
characterized by that the auxiliary electrode oper
ates as an anode when the last named switching
means is operated to connect the high frequency
ampli?er and the low frequency ampli?er di 35
rectly.
'7. In a radio phonograph combination, a high
frequency ampli?er circuit, a detector circuit
and a low frequency ampli?er circuit coupled in
cascade in the order named, said high frequency 40
ampli?er including an electronic tube having an
anode, a cathode, a signal grid and an auxiliary
electrode, a circuit including a phonograph pick
up device, means for connecting said circuit in
the input of the high frequency ampli?er, an
?rst tube, a diode recti?er, means including a
auxiliary output circuit for said high frequency
coupling condenser for connecting the anode of
ampli?er comprising means connected between
the auxiliary electrode and the cathode, said
the ?rst tube to the anode of the recti?er, a
connection between the anode and cathode of the
recti?er including an inductance coil and a pair
of resistors in series, means including a resistance
element for connecting the auxiliary electrode of
the ?rst named tube to a positive source of cur
rent, and means including a tuned circuit for
55 connecting the anode of the ?rst tube to the posi
tive terminal of the source of current, means
means including a switching device, and. means
connecting said last named circuit to the input
of the low frequency ampli?er, said detector cir 50
cuit including means for preventing energy trans
ferred from the phonograph pick-up device
through the ?rst ampli?er circuit from travers
ing the detector circuit when the last named
switching means is operated so as to connect the
comprising an operable switching device and a
?rst named ampli?er to the low frequency ampli
coupling condenser in series, adapted to connect
?er through the auxiliary output circuit.
the auxiliary electrode of the ?rst tube to a
60 point intermediate said two resistors, said switch
JACOB VAN SLOOTEN.
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