New-York tribune., 1922-02-05

the amount OF current that passes -.
The vacuum tube 'uga
The vacuum tube is simply AN e1ac.x.
bulb specially constructed With q r,a.., "sHt
and q coil Of wire placed around tho e,s '''l
5oth the coil Of wiro and the sheath nerss.D ,s""
special functions, which it is not nsca-' '"
Tor the novice TO bother about. " y
however, for the purpose Of his nocLo..' as''
bother about the filament because tho
tubes ut the present time are verv h;~r 'm
price II
In this connection there are TWO =. !,
rules it Is we'll to remember and mt ~" .'
practice when using your receiver. b. ~
let the filaments Of your vacuum subes Nv "0'
too brightly. because if you DO Won sro w."
necessarily shortening the life of the tnha ~
getting no corresponding benefit from ;,
soon as you have obtained maximum siyn.,.
the telephone receiver, 90 not turn tbo
sistance knob any further or you will be h.-
ing the filament too brightly and vou 49,,
cause the receiver to shrek Or howl. Anotss.
rule IS to watch your storage battery. and =.
soon as it begins 30 show signs Of wa.,,..
send it to charging station t, be racb..~'"
This is important and should never ha o.'S ss-
looked. e'
One OF the most disappointing things g..
can happen to the novice is to turn tba sls
1nen5 adjusting knob too far and then yst =.
signals at all He founders about in desns,
with the adjusting handles, and. snd;-
everything silent finally gives up, declar
the thing is no good. He does not ston ;,
think that this receiving set needs lust :.
much proper care as does his pet razor.
What has happened when he pushes the Fl.
nent handle over too far is simple 70 ezpla;,
The vacuum tuoe is an extremely sensitive =.
strument, probably the most sensitive that b.,
cFer been devised by man and Unea ne pusb..
the knob over too far the novice parsvs.
the tube
This can best be explained By iikening tn.
tuoe TO very small drum. which would piv.
out sonorous notes when struck by an orr.
nary match head. Sucn Z drum would ne a..
tremely sensitive. Imagine what you'd bas.
per to it if it were suddenly struck with
sledge hammer. Well. that is practically vba.
happens 10 the vacuum tube when too much
current IS passed through il suddenly.
The vacuum tube, however, possesses ~.
cuperative powers unequalled BIZ anv otte,
apparatus. After il has been strucl. seura
tive blow. if it IS let alone i Will completelv
recover in less than thirty seconds and cOus
back TO normal functionng, SO that il is ur.
necessary to flounder around i-,-in. 10 90.
new adjustment.
As soon as Jour station 1ts been j: .ts'ai
the best thing TO do is TO adjust the tuler ans
1iamert handles until maximum. sigma. hars
been obtained write dow the figures on Ire
tuner handle, and then whenever -ou wish .
listen 10 that particular station again all vos
viii have to DO IS to turn the knob to that pa..
llcular number and YOU will near
These vacuum tube sets usually come WI.
Two stages Of anlplitication In other words
one OF tire vacuum tubes act a. the de.ecto
and Two more tubes serve lie purpose Of anp-
sjers, each in turn increasing the strength q
The reproduced voice o. music until It is lou.
enough to be heard all over the room in IA.
loud speaker
1t is IN connec.ion with inc loud speaker
that The future has the greatest possibilities
The radiophone concert is OIL. q. is begin
ming. 1t viii be improved wonderfully during
the next few years. and there 40 great oppo--
Junlties awaiting the inventive genius Th.
entire radio world is concentrating upon the
development OF q lou4 speaker that viii be irss
from all kinds Of distortion or Other draF
oacAs. The loud speakers Of tne present afs
good, considering nov nsw they are, but ua
doibtedl. they VIII BE Yastiy improved.