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operation
_
PRELIMINARY:
Be
sure all tubes arefirmly seated intheir
sockets and that the VI tube shield is making good contact
with its base. As initial adjustments, set these controls
as follows: VOLUME at zero, BASS at zero. Turn the am-
plifier on by turning the TREBLE control clockwise from
OFF and set It at zero Initially. Note that the VOLUME,
BASS, and TREBLE controls all affect the TAPE OUTPUT.
LISTENING TO PHONOGRAPH: Set the SELECTOR to
PHONO if you have a magnetic cartridge or AUXiliary If
you have a ceramic
-or
crystal cartridge. The RIAA equa-
lization provided for magnetic phono cartridges
Is
now the
standard In the recording Industry and is also a very good
compromise for the most important of the older characteris-
tics. The better ceramic cartridges are also self-equalizing
according to the RIAA chorocterlstlc .
Use the separate
bass and treble tone controls to compensate for inexact
matching of the actual recording
characteristic
as well as
the over-all characteristics of your audio system (Including
room acoustics).
LISTENING TO TAPE DECK (direct connection to tape
head): Set the SELECTOR to TAPE HEAD. NARTB tape
equalization for the 7 1/2 and 15 I. p. s. speeds is provided
by the preamplifier-equalizer at this position
.
This equali-
zation
Is
the industry standard for pre-recorded sterea and
monaural tapes. The bass and treble tone controls can be
used to compensate for Inexact matching of the actual re-
cording characteristic.
LISTENING TO TUNER, TV, TAPE RECORDER HAVING
BUILT-IN PLAYBACK PREAMPLIFIER - EQUALIZER: Set
the SELECTOR to TUN or AUX depending on the Input
desired. The corresponding high level input will feed
through the ampl ifler. Adjustment of the level control on
each source is discussed in the" ELECTRICAL INSTALLA-
TION" section under" High Level Inputs".
MAKING RECORDINGS:
Tape recordings may be made
by connecting the recorder to the TApE OUTPUT jack
.
See
"Tape Output" under "ELECTRICAL INSTALLATION"
Please note that recordings cannot be made on tape decks
intended only for sterea or monaural tape playback
.
Re-
cordings can only be made on tape machines having record-
ing facilities including the necessary el ectronic equipment,
whlchmaybe either built-in or supplied seporately by the
tape deck manufacturer.
BASS CONTROL: The plus sign on the right side of the
dial indicates that clockwise rotation from the mid-point
(0) Increases (boosts) bass response; the minus sign on the
left side indicate that counter-clockwise rotation from the
mid-point decreases (cuts) bass response
.
There is no in-
teraction with the TREBLE control. Start all adjustments
with this control set at the mid-point (0), wh
ich
Is
called
the "flat" position
since
bass repsonse is ne
ither
cut nor
boosted at this setting
.
TREBLE CONTROL: The plus
sign
on the right
side
of the
dial indicates that clockwise rotation from the
mid-point
(0) increases (boosts) treble response; the minus sign on
the left side indicates that counter-clockwise rotation from
the mid-point decreases (cuts) treble response
.
There is no
interaction with the BASS control. Start all adjustments
with this control set at the mid-point (0), which is called
the "flat" position since treble response is neither cut nor
boosted at this position.
maintenance
_
TROUBLE SHOOTING & OPERATING NOTES
Your amplifier should require little service except for nor-
mal tube replacement.
We recommend no substitutions for
the tube types used in this amplifier except as stated. All
the tube types used are distributed nationally
,
but replace-
ments can be obtained directly from EICO If desired.
Tofacilitate servicing, remedial and trouble-shooting pro-
cedures have been provided in the TROUBLE-SHOOTING
CHART tho t follows
.
A VOLTAGE AND RESISTANCE
CHART is a
lso provided
as an aid In
locating
defective
components.
DC operating voltages are given both at no
signal and signal developing 50 watts output, as wei I as
the corresponding I kc signal voltages.
cal'"C
l n u
cr":]"-ClCIf"!II~II
C .
5
TROUBLE-SHOOTING PROCEDURES
Connect a phonograph and speaker to the amplifi er as de-
scribed in "Electrical Connections" and set controls for
phono listening. Playa known high quality LP recording
on the phonograph
.
If there is no output to the speaker
or if the output Is low or audibly distorted, procede to the
checks for those symptoms.
If
there is excessive hum in
the output, disconnect the phono input cable from the
amplifier and short the phono input jack to chassis
.
If the
hum disappears, the trouble is not in the amplifier but in
the phonograph or in the connection to the ampl
ifier .
The cause of phonograph hum may be a metal pick-up arm
not grounded to the cable shield (try a good single ground
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Table of Contents
Troubleshooting
