Eico ST 40 Instruction Manual

Page 2

Elcom

40 WATT INTEGRATED STEREO AMPLIFIER

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GENERAL DESCRIPTION

The ElCO Model ST-40 is a complete high fidelity
stereophonic control centeranda pairof 20-watt amp-
lifters, all on one chassis», With it, you can select,
preamplify, and control any stereophanic or monophic
source and feed it through the self-contained dual 20
watt amplifiers to a stereo pair of speaker systems.
Provision is made For operatinga center speakerdirect~

ly From the ST-40.
FEATURES

1. Provision for two stereo phono cartridges to be
connected. Permits the use of both a turntable and a
record changer in the installation. One pair presents
47KQ load and the other pair lOOKQ load, to cover
most popular cartrigeso RlAA equalization.

2. Provision forconnectingstereo tape heads. NARTB
equalization for 7 1/2 IP50

3. High level input pairsfor multiplex adaptor, pre-
amplified and equalized tape, FM tuner, 'and AM tuner.

4m Separate level and balance controls. Null-type
balance checking circuit.

5. Switched high and low frequency filter circuits
permit elimination of rumble problem or scratch and
distortion when need be.

6. Switched loudness compensation.
7. Tape monitor switch.

8. Feedback equalization, with feedback around both
preamplifier stages. High overload point.

9. Bass and treble tone controls are of the variable
inflection point, Feedback type forexceptionally low
distortion and the most desirable control characteristics.
These controls do not affect the volume orinteract with
each other, and boost or cut at the extremes of the
audio range do not affect the mid-range.

to. Separate filamentwindingsand humbalance con-
trols for each channel permit an optimum hum balance
for each channel, rather than a compromise for both
channels.

it. Unused inputs grounded by SELECTOR switch to
eliminate cross-talk ~ except for TAPE inputs, since
some tape machines are adversely affected if playback
outputs are grounded during recording.

l2. I Provision for feeding a center speaker directly
from the ST-40.

l3. Conservatively operated 759i output tubes, and
highly efficient,GZ34 rectifier.

COPYRiGHT© 1960 ELECTRONIC INSTRUMENT COMPANY, lnz.