PS Magazine - MAY 1977
PS, The Preventative Maintenance Monthly
ISSUE 294
MAY 1977
That AM-3349 can CarRy a poweRful
load, but it CouLd bog down, maybE at
an EmbaRRassing timE, if it's not tunEd
whEn it±s opERatEd.
Shy away fRom putting thE HV
²EsEt switCh on TUN³ until you havE
pRimaRy voltaGE´ With a Cold sEt, a
suRgE of high voltagE Can CRaCk thE
nEµtRalizing
CapaCitoR´ That'll
put
youR sEt down and out´
¶nlEss you tunE it Ri·ht, you'RE aPt
to gEt hit with failµREs of thE ¸¹22
plºtE tRimmER CapaCitoR´ And, Conk»
oµts likE that Can put
¼
YoµR A½gRy-106
on downtImE´
thE powER amplifiER is not REstRiCtEd to
just thE ¾²¸¿106´ Àf thE AMÁ3349 is
not tREatED Right and not tunED Right,
it Can fLÂÃk out in suCh ConfiguRations
as
thE
ÄN/VS¸-2
and
-3
and
AÅ/¾²¸Æ122 and -142´
So, it±s a good idEa to bE EspÇCiaLly
CaREful
whEn
you
synChRonizE
thE
ÈOAÉ and TUN³ dials´
Êou
havE
to
makE
CERtain
thE
TUN³ and ÈOAÉ mËÌER nEEdLEs aRE
in thE CEntER positionÍgREEn ÎoRtion
of thE
sCaÏEÍBEfÐRE
you
tuRn thE
Oѳ²A T³ÒTUN³ switCh´
52
TuRn bÓth knobs at thE samE timE in
thE oppositE diRECtion of thE indiCatoÔ
•
'
ERRoR. Éo thE twisting REal slow; Àt's
'
almost a suRE thing that thE pointERs
,
wIll CEntER whEn you do youR adjusting
: this waÕ´
If the needles fail to ceNTer iN
±
minutes, switCH to
OPER TE
AND
alloW tHe fiNAl AmplifieR tubes to cooL
Fr
²
MiNuTes. ±HeN, tRy again.
OÃCE thE mEtERs CEntER, ChECk FoR
ÖOW³²
O¶T
wit×
thE
T³ST
M³T³²´
ØEÙÚE
swItC×In·
thE
ÛowER
WhEn
you
gEt
thE
Right
sCaÏE
ampLifiER, tuRn thE ÜݳÞAT³-TUN³
REading, thE sEt is REady to opßRatE´
switCh to Oѳ²Aà³´
SwitCh baCk to OѳáAT³ ´´. and
WhEn you ChangE fREquEnCiEs oÃ
makE suRE you havE givEn thE sEt a
thE ²T-66â oã ²T-834, you havE to
minutE to waRm up bEfoRE tRansmitä
RE
å
tuRn thE ÈæAÉ and TUN³ mEtERs
ting.
on thE ampLiFiER to thE CEntER position.
OthERwisE,
buiLt¿up
hEat
çill
²ECEntER thE nEEdLEs iF nèCEssaRy´
This'Ll LEngthEn thE LifE spºn of thE
tuning CapaCitoR´
Àf you'RE having téoublE gEtting thE
mEtER pointERs to CEntER at thE samE
timE, tRy this bEfoRE you hEad youR sEt
Foê thE maintEnanCE shop.
DamagE thE pÏatE tRimmER CapaCitoR.
That miÃutE wait±ÏL gët Rid oF thE hEat
in thE Finaì amplifiER and pREíEnt
tRansistoR DamagE.
MakE suRE thE îV ²³S³T switCh is
aLways oà Oѳ²AT³ bEfoRE you tuRn
ofF thE sEt. Àf yo tuRn it ofF with thE
switCï on TðN³, thE high-íoÏtagE
REsEt REÏay wiLL not EnERgizE´ This
ÏEavEs you with a non-woRkin
sEt.
53
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