Belt Valley times. [volume], October 22, 1925, Page Page Six, Image 6

About Belt Valley times. [volume] (Armington, Mont.) 1894-1977

Image provided by: Montana Historical Society; Helena, MT

                
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Four-Tubs R «coi ver ta Which RF Stags Is Connected in Two Tubas; Detec
tor U Rsgsnerativs; First Audio Stage Reflexes in Parallel Stage.
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Diagram Showing Same Circuit as That In Fig. 1, Except That the Second
Audio Stage la the Reflexed One, Instead of the First.
By SIDNEY E. FINKEL8TEIN,
In Radio World.
For the fan who has made many
sets some variations on the accepted
themes are very inviting, hence two
eirculta are presented that offer en
couragement to those who like to work
out solutions from suggested data.
The first circuit (Pig. 1) consista of
a stage of tuned radio-frequency am
plification, with Its two tubes connect
ed In parallel, a regenerative detector,
the first stage ofsndio reflexed In the
parallel-connected tabes, the second
stage of audio being "solo."
The other circuit (Pig. 2). using the
same principle, makes the last andlo
Stage the reflexed one. The parallel
connection of the tubes in the reflexed
Stage is retained.
Only one reason for connecting tubes
(n parallel may be advanced—to make
them share equally the load of the
stage In which they are connected.
With RP amplification so popular
often there Is too much of It. so that
distortion arises from RP causes, no
less than from an overburden of andlo
current
Two Audio Stagoo Employed.
As ths test Is one for reducing the
overload. If any, two audio stages must
be employed. Some may find that the
I hook-ups as suggested will improve the
menters may establish to their own
satisfaction which of the two methods,
If either, gives them better results In
quality, and possibly even greeter vol
ume than obtained heretofore, when
the four tubes were hooked up simply
1 q straight faalilon.
Constructors who have teat boards
will find the circuits very Interesting
subjects of experiment. The change
Involved In making one Into the other
is slight.
The set, in point of distance getting,
will not accomplish any more than the
regulation book-up. But if a fan Is
troubled with distorted reception, in
stead of introducing resistances across
audio transformers, or condensers that
cut down the volume, be may try
either or both of the methods outlined,
and see If he cannot get very dear re
ception without any reduction in
volume.
L1L2 is • radio-frequency transform
er sad Cl Is a variable condenser of
correct capacity to tune the secondary
L2 throughout the band of broadcast
ing. L8L4LS Is a 3-circuit tuning coll
in which LO Is ths tickler. C2 tunes
L4. C8 is a by-pass condenser, about
.001 mfd . So is CS. R4 la a grid leak.
abont 2 megohms
The tubes are numbered 1. 2, 8 and
4. In effect tubes 1 and 2 represent
only one stage In either diagram. The
Input la to tiie two grids snd the out
put is from the two pistes Theee two
tubes should be of the same type.
Two Tubes in Farm!lei.
The RP load on the tube Is pertly
determined by the number of turns on
the primary L8. Oen«rally speaking.
the lesser the Inductance end coupling,
the tendency to overtoed.
But aniens one has a ratio of at 4-to-l
the
there may be losses, L e. Insufficiency
transfer of energy. Assuming, there
fore^ one bee the type of winding*
moot commonly used, where that ratio
is need, or something user It, there
may be still quite a tendency to
too much BP work of the tret tube.
Hence we will use two tubes in parallel
of say
ha
the standard ta»ok-up, we must resort
■3 ; a .fr#*
ra
cultien and » tbe reflextag Isn't a
cereftil wtrtti* Job, with proper regard
for penltten snd length of leads, a» at
tempts to attain Improved results an
almost certain to fan. Hence be cure
:«i ,a your
Now. Ö» la«
heavier tafle load. Maybe that la tbe
»ne that should be reflected, since the
are to be delivered into tbe
pai»JlM-««M»W'ted stage, which U ts
assumed «re «bte to handle them beet
But the experimenter may find that
tbe sadto toad Is not the troublesome
t Ab red»« load having been
•hared, astiafbetorily between tbe twu
tabes (1 mä 2 ). to#
àvMm O« «**» *•>*«. «Bd not for I
to aa
audio overload. Therefore, in such a
case, the first audio stage would be
properly reflexed.
would be shorter that way.
Fans who do not care much about
the coat entailed may omit the reflex -
log entirely and use either parallel
connected tubes In the radio stage or
In the last audio stage or in both
places, as an experiment.
The two seta shown La the diagrams
work well, as do the two others sug
gested. The problem Is for the experi
menter to decide whether the parallel
idea la worth while and If so, whether
for radio or audio reasons, or for a
combination of both.
Also the leads
To Use Neutroformer in
Your Single-Tube Set
Here la II D. hook-dp which «aas
a tmlt the same as a radio frequency
transformer in the nentrodyne set.
The coll LI consists of ten turns of
No. 28 dsc. wire on a 3-tnch tube
which la dipped inside of coll L2.
This latter coll consists of 58 turns of
No. 28 dsc. on a 2%-Inch tube. C rep
resents s 23-plate condenser attached
to the L2.
To tune, writes s Michigan corre
spondent in Radio Digest, vary C for
the wave length variations and follow
VMK.<m»UEAK
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Using Unit Same as Radle Frequency
Transformer In Neutrodyns Set.
ap with the variometer for régénér
era tl on. Keep the two in such rela
tion that It is Just below the point
where a rushing sound is beard. If
properly constructed and operated the
set will give excellent results go a 190
tube with an electric light circuit
serial. With the same kind of an
aerial and two 190 tubes as audio fre
quency amplification I have beard
Mexico City, stations in California and
two Cuban stations I have a total
list of 88 stations
%seaammssaaoaa^^
RADIO RHYMES
By Robert Stewart Swtliffs
IN THE EVENING
W
HKN the saew ts on the
readway and the wind a
blowing hard.
And tha weather uninviting as
you look out to the yard:
(Or perhaps down south you're
living and you have no place
»e go)
Then'a the time you feel Uke
giving your thanks for radio
Whan your faaslly*s 'round about
you. and tha things are
cleared away.
And tha dally paper's finished and
x: .
you haven't much to
where all thing* ars mighty
T«w n%m brash »way âefeettos i If
Ti
gat tha folks to listen aa
you plug Into yaur sat.
they cannot help but marvel
at Om wood roue things yae
etar a -singing
distant blg-tawn
a-ewtoglag
through tbe air by radia.
at
abow.
Or a Jasa that
Perhaps some fallow's talking
about tha star* above.
Or
yotsnjg
tHt you low:
Or perhaps tbe girl* are dancing
to a tuna from Chicago.
A thousand things entrancing era
ffcr you fcy rwA%<x
■hm HMm
for retiring and
Will Soi«« oy rrmMmm
tb«
of making beta
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EVERY
7
Probably
raw» fer the
popularity of
WRIOLEY'8 is duc te 1***»
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Fresh and fall-flavored
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Free Farm
BaUfltaf
Helps
^ Comoro t* Around ihm
km buOdtag
zz
k assy to
■mix. ph* c®, sod
ks Û
"Perm ait «rtf Repaint an
#Ae Form" «b» «>a hewn
repair old building* qmckiy
Bans Floors and Feeding
Floor* will help you afld.
a dofiar to your oar
"Wsailbr Concrmtm Fmrm
Building*
plies ol bl ire prints, sod shows
yon. (ttp by sssp, bow to put
up Concrete Silos, Dairy
Barns, Hog Houses. Milk
Houses and many other forms
rji Ouracrate Oooamjciwo.
fl Wtafcw jo»___
Uaid*am»buiUi*t.orapmtr
m éo 0m td> «fl Urnm.
Sard for thorn today
PORTLAND CEMENT
ASSOCIATION
. IP
111 Warn VhUmh
CHICAGO
Soest
omd Erumd Urn Vtm of Comeroto
fLEAR YOUR SKIN
V# of (fisfiguring blotches oui
ten tatioas Use
Resinol
Boy* Study Leather
A junior technical day school for
training boys for the boot and shoe
trade has been opened in connection
with the Cordwainert' Technical col
lege In London, England. The course
will be divided between general edu
cation and trade subjects.
Woman need no longer have the dis
comfort and untidy appearance of
ragged or 'Tun over* beets. They now
have available a topHft (bottom cap
Cf heel) that Is abeolutely gat on the
bottom, stays firmly la place and wears
and wears Just Ssk your repairmen
on your heels,
material that
to put U8KIPE TopHft»
U8KXDE ta the famous
■ giving each remarkable senr
no* sole for year«. Made by
ths United States Rubber Company.
Wears twice as long as bes t leather.
Important—you can put TJBKIDB Top
lifts on new rimes,—Adv.
ii3v
Imltmd m J oop m tr dy
The picturesque island of Mount
Saint (Normandy) appears to be Jeop
ardised as the result of a landslide.
Engineer* art trying to save tbe beau
tifnl old abbey which crowns tbe rock,
as It Is (bered the slide any extend
to tbe foundation.
a
Homely
He—Til say she hasn't.
.a
SgS-*
Hot water
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