Eico HF 12 Instruction Manual page 10

Section AUX TUNER PHONO TAPE HEAD
1 - 11,
2 - 11,
3-10-11, 3-4-11,
Selector A
3 - 4
4-5 5-6 6-7
Switch
11 - 12,
1-11-12,
1 - 2 - 11 - 12,
1 - 2 - 12,
B
2 - 3 - 5 3 - 5,
8-9
5 - 8,
8-9
9 - 11
Entries are numbers of those switch contacts which are
connected together by the rotors at the particular position.
11 7VAC
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M OO " " . , .
I I
I"!IGH F ' OE:.LlTV
1'2 W A TT AMF' LI f-l i:.R
2 50W
HUM
ADJUST
o
I
' m m°(i)"Ci)'
I
OUTPUT 16 S 4 G
TOP vlrw
AUX TUNER
00
MAG. TAPE
00
PHON O HEAD
V -3
V - 2
0
o
ECCS3!12A X7
ECCB3 !12AX7
M O Oi:. L "''''2
"' .GH F IDE L" " V-1
o
ECC S3!12AX7
V -4
o
E L S .4
V - 5
o
ELS4
V -6
o
E ZS1
POW E R CO NS.UMP TIO N
l!Ll!CTRON IC ',," S T
co
"', C
TRANSFORMER TEMPERATURE
nONT
The temperature of the transformers used in the HF-12 run at less than 1950 despite the fact that the safety limitis at a much
higher 221 oF. Although 19SOF is cool for a transformer, it is very hot to the touch. Transformers which seem too hot when
touched with the hand, are usually good and are actually not overheating.
Output transformers usual! y run cooler than power transformers. Some output transformers may appear hotter than others due
to being located near hot components such as output and power tubes and power transformers.
OUTPUT TRANSFORMER LOAD
The output transformer and the output tubes of any amplifier are subjected to severe stress when the amplifier is operated at
a high signal level without a load. To protect these components against possible damage, always have either a speaker or
resistive load connected to the output terminals of the amplifier while it is being operated.
9