Specifications

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 chorocter lstlc . Use the separate
bass and treble tone controls to compensate for inexact
matching of the actual recording cha racteristic 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 s ince bass repsonse is ne ither cut nor
boosted
at this setting .
TREBLE CONTROL: The plus sign on the right s ide of the
dial indicates that clockwise rotation from the m id-po int
(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.
To facilitate 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 locat ing 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 amplifier 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