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.t.DDF.I•'Dmr
#'2
TO FOIDER #131-666
Il!STALLil!G MID OPERATH/G IHSTRiJCTIONS FOR
l!ARCONI TR.~JSlil'ITER-RECEIVERS TYPES PNlA AJID PNlB.
The follouing shO'~ld be noted ,·men ordering sp;.re or
re?lace:nent components for PNlA and
PNlB
eqaipr.ients-:
In
equipnents manufactured prior to
Sept.
21,
1949,
in •.1!'.ic:1 the transfcrner
T4
is ;1arconi type
95178,
and
the transformer T6 is llarconi type 95183, the
condensers
Cl3
and
C20
aro
9Crn.'llf
+~,
50CNN
,
Aero-
vox
type
1469,
Cl4 and Cl9 are
35mn.f
+21',
500.'N,
Aerovox
type
1469,
C25 is
o.
re
nf,
+4oowv,
Harc,mi
type
#911-203,
and the regenerative coupling
link
referred to in !iodification
#2
of Addendum 4f,1 to
these Instructions is not used
,
In equipnents i;,.anufacturod after Sept.21,
1949,
in \·;hich transforuers T4 and T6 are liarconi type ·
lx;-S.~2
,
as described in llodification
#3
of
Addei-,-
du:n
#1,
the condensers
Cl3, Cl4,
Cl9
and:
C20 are
all
120 c.uf
±51,,
5'XT.N,
liarconi
type
914-121,
C25
is
'el.iminated,
a.'ld the regenerative
lir,k
is
added.
When spare nr replacement
parts
are being ordel'-
e1 for the condenser Cl2, llarccr.i
type #9ll-50;5
,
ref
erred t'> in ~odificaticn ,f.l of Addendtn
,f/,l r.ia.y
be
specified
and
used in' all
PNL~
and
PNlB
equir>-
aer.ts, 1lar~rni
typP.
1Cl,L016.! is
suitable as
a
·
rcpl ..
~er.:ent
for Cl2 c-nly in tho:;') equip:ients nanu-
factured
prior t'> Se;,t
.
21,
1949,
hm:ever.
Apr
.
18,
1950,
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