Document 442114
@
,
TYPE
''R'' UNIVERSAL
\
J.
OUTPUTS
l
While the ave.age speaket voice coil has an impedance of 8 ohms, speakers of difiereni manu{acfure diverge videly
{rom lhis value. l{ lhe voice coil impedance can be delermined, ihe cha't below will indicate tLe best possible match to *he
tubes used. Where lhe voice coil is nol known, triel will indicate the besl malch.
lf itis
1,
increased
I
desired to d-', 'iadi61he lo*-6d-tntfi-t€qffiles, lhe impedsnce should be -rihmetched. The lows wilfb;'-- '
if lhe voice coil i! connected lo a lower impedance and the highs increased i{ il is connected to a higher impedance.
The upper seclion of the chart indicates ihe tube or tubes from which +he iransformer operales. l{ using push pull
fubes, the blue leads go fo lhe pldles and the yellow io B plus. lf using a single lube, I blue l"uj go"s +o the pla-+e and 'the
olher blue lead to B plus. When the lube combinaiion used is {ound in lhe upper pa.i o{ ttre chart, ihe various secondary
impedances oblainaH,!:*are read down the column benealh il. To ihe exlreme lefl of the desired imped:r.:e, +he co,.esccrd-
ing colours are nofed.
-_.---
-r
R-27, R-38, R_38A, R_se, R_60
!1, 33. a5.
47,2A5,
Pssh PullT!bes
49 class
Bg
6276 clasr
19, lJ6c,
30,89,
6A6,6N6,
6N7,685,
rub.s
r2,lt
\-
Pri. lmpedance
.
€reea.
Red &
Whitbi
Blacl
Red " RsJ & White
Red
-
f
7tA, t245,
tl !6,59
25A6,25A7
to
Secorld1ry
8!
Lir.
49,
6V6,33
89,245,
'.r
_-. -a,L,t.
5F6,6Bs
. . |4OOO
Slacl
Elacl - Red & Whire
Green - Blacl
Red - Greoi
Red . B-o-.
Brown
6G6. 6K6
R.tio
43.45. 59.
r -:- -'d't*--
_:S.
P-P
45A8
33,42,46,47
59 7lA.r0.
2516,6Y6G
645G.684G,
6AC5G,53,
59 Peni.
79. 89 Penr-.
5E5. 6Y76
5i.ere
243,5A3,
42AP,,45,
43
t.8
2.7
t6
s.6
a;- _
12.;'
t'.t
3s
r0000
tiOOO
r.5
-
?.1
rl00
7000
t.3
.9
1.9
t.3
t.2
1.6
3.1
2-6
2
1.8
{.8
4
l.!
2.8
4.t
5,9
{.'
9
f-l
16
t3
t0;
30
2E
7.t
rl
6000
4000
.55
.5
7700
'11
52
.t
t.1
ls---*..+1'
4.5
5-5
7.8
9
i7.5
t2.5
2500
r700
5.5
t5
00
I
t.6
6.1
20
5@0
1.6
t00
5.2
)7C
t0
.00
R-ze
t!--*r-t-
Posh Pull Tubes
Pri. lmpedanca p-p
Brown
'
-
Stact
Blacl - Red & Whir€
Green
Ir
,
Red
- Green
Red
-
Brown
,t\
I
Red
-
stdck
Red-Red&Whife
r,
6V6. r0
3.3
7.1_
l0.l;
841
616 sel{
t602
8000
2.5
Blaclr
€reei-Red&Wh;r6
,.\
2A5.
/u. ff 6
P.d. AB
10000
685
7000
45,
42,-5!,,&\s
6F6
triode AB
:atio
6000
t.6
t,5
2.7
2.7
2
3.8
3.t
2.9
t.8
5-7
5
4.1
4.3
8.4
7-5
7
6.3
3000
t.3
2.4
950
I
4.8
625
t6.5
r5.5
t4
t2
29
25
23
2t
l8
R-58 color code.
2100
t400
t,9
f6 r
3000
t.4
3.t
23.5
See reverse 5ilg
I
2-l
t3
9.6
4000
5.3
t6
t0.5
.75
425
t0.7
280
CONNECTION CHARTS
,+
i{)rt{€
Cenier Tap
RED
L
325V.-0.325V.
R.:
40 Ma.
:51'/ -C.350V.
5
5V.-2A-
e.!'.2a
"
:.'"' :
4
'.
s_1-:
E
NO.
RI
c3
FtL, No.
I
R.d
coLoRs
TYPE
TYPE''R'' TRANSFORMERS
r!?Ai.tstrcRVERS
coLoR CODE FOR POWER
-:-: :i ''' Aiv
BI-ACK LEADS ALWAYS lNDiCAi:
:_-.:'r No, l
' FILAMENT No.
|-':
Eloe e': --'.
Blse.While
E'c-':-:
gLU
3L!€
sLA-TE
YELLOW :; . .i \
2.5V.4A.
sV.-3d c-1V..2.5,A.. 2.5V.-8A.
-1sov-4-350v. s,..3A. 6.1v.-4.5A. 2.5V.-4.sA. :.aV.-iA.
95 Ma.
175v.-o-375v. :'..4A. 6.3V.-5A. 2.5v.-5A- :,:, - 5420 Ma.
lssv..o_385". :v.4A. 6.3V.-4A. zjy.4AI
R5
180
R
Mi.
350v.-O-3ith\5v.-3A.
5.3V..-?A-
75 Ma.
37sv.-0-375v
iC Ma.
5l-3A. 6.3V.-:A425V.-0-42sV. 5 '..34. 6.3V.-5A
200 Ma.
3004.300v. 5v..2A. 6.3Y.-2A-
Rt2
R54
6.3V..5 A.
:2.sv.-trA....
L5Y.-34.
-:-
"'
2.5v.r44;
1
.
2.5V.-8A.
:
2.5V.-5A.
: ' .-lA.
2.5V..12A.
2.5V.-5A
VARITAP DUPLICATE AUDIO TRANSFCRM:R5
,:: ,.,ni :Blue
SECONDARIES_
.-+::*=*-qr:i.
to
plates:
R23, R29
'
ple:e return.
Green 1o grid; Red
.
Bro*n
R24, R25, R26
Red to qridsl Greer:
:o plales; Yellow to p,aie return.
R29
to
-.-
':
:
9-
-eturn.
i
chdr+s
or
--*}\
relurn.
R27, R28, R38
-
microphone or line; Yeilow
ro ..rurn,
See T "'put
NOTE:-R 2 s conneclions as aboye for Class A triodes. slep r,r, i,5: L
:':: dc--, 1.5.1, {or 616's, 2A3's, 2A5's, e+c., rlverse lransiormer.
Black
io 9'
reverse side
oj :"e:-'
8.58
245
lA5
{r!i)
tFaE0
(Ei)
2546
3l
6li
6F6
,t{t
50
5Aa
33
42
6K6G
{5
:.
P,BI.
l.l
1.0
7,0
t2
_8
l
t0
l8
{8 ll{
150 Vqrick Streel,
',IER
lll
111,8
*[-f," 1,. 1,. l"
ll7
UNITED TRANSFOR}
/'--.,_--
rc
14
CORPORATION
New York 13, N. Y.
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