Electrical Research Lab 6100 Schematic

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Product Information:
Manufacturer:Electrical Research Lab (Sentinal)(ERLA)

Schematics Content:

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faok (2 Types

var ww


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Parts List
Line voltage z 32 volts
Volume Control: Pall On
TUBE PIL. rms scam ckmoos
'78 1st Detector 6.5 160 'IO 5
sv oscillator 6.5 loo 20
'77 2nd Detector 6.5 65| 256 25
$6 output 6.5 lso loo 15

2525 Rectifier or 84 Rectifier

*- comparative voltage only.
Read voltage from socket to receiver chaeeie.


This receiver is designed to operate on 52 volt battery plants only and must not be u: 3d
on .'56 volt battery plants without a voltage regulator. Generally, it is not advisable to
operate the receiver while the generator is chargini; the battery due to the fact that consid-
erable radio interference (static noise) may be encountered. This is not a reflection on
the receiver, but is due to interference caused by the power plant generator, itself. Some
generators have built-in traps to eliminate this interference and when so constructed this
particular ty-pe of' plant generator will not cause interference. If excessive static noise
is encountered be sure that it is not caused by the 52 volt plant generator.

THIRTY-TYIO VOLT POWER UNIT: Two power units have been furnished with the six tube 32 volt
rece ver, one un u zes a 25Z5 tube and the other an 84 tube. Diagrams for both of
these units ere shown on the receiver circuit diagram. It will be noted from the parts and
price list that all parts with the exception of the power transformer and tube sockets are
interchangeable. When ordering these parte be sure to order by part number.

NOTE: The dynamotor type unit supplied with the five tube 32 volt receiver cannot be used
with the six tube receiver nor can the power units (utilizing the 84 or 2525 tube) furnished
with the six tube receiver be used with the five tube .'52 volt set.

The 52 volt power unit is shipped unmounted and must be placed in the sound-proof colo-
tex compartment. In the console models this is located below the receiver mounting hoard
end in the table models it is located above the chassis. To install the power unit in the
sound-proof box remove the wood screws which hold the celotex back to the box, then place
the power unit on the rubber mounting blocks provided inside of this box so that the unit is
floating free on these rubber insulators. it is very important that the unit does not touch
the side of the box. If excessive vibration is noticed be sure to check the power unit in-
stallation, as excessive vibration will result if it is not propa'ly mounted on all of the
rubber supports or if it is permitted to touch the side of the celotex housing.


A type T-Si #40 6.15 volt pilot light is used. The pilot light is readily

e .or removal from the rear of the cabinet.

ANTENNA AND GROUND: Under ordinary conditions an aerial from twenty-five to seventy-five
ee n eng nc uding lead-in will prove ample. In some locations which are located a
considerable distance from broadcast stations it may be necessary to use a longer aerial
than this to obtain satisfactory daylight reception. Never place the aerial lead-in in
close proximity to the 52 volt lighting lines, as considerable static noise may be picked up
if the antenna lead-in is run parallel to the 52 volt power lines for any distance.

INTERMEDIATE ALIGNMEN'I': Only when an intermediate transformer has become defective due to
an open or urne ou w nding should it be necessary to readjust the intermediate transform~
er. For aligning either the intermediate transformer or the variable condenser it is
necessary that an oscillator be used with some type of output measuring device. To align
the intermediate transformer:

l. Connect the high side of the oscillator output to the control grid of the #35 mod-
ulator tube. The ground side of the oscillator should be connected to the ground lead.

2. Set the oscillator at 465 kilocycles (this :mist be accurate) and adjust the output
of the oscillator so that a convenient reading is obtained on the output meter.

3. Align the first intermediate transformer by turning one oi' the intermediate trans-
former trimmer screws up and down until maximum reading is obtained on the output
meter. Then adjust the other trimmer screw in the same manner.

4. The second I. F. transformer should next be adjusted in the samemanner. The in-
termediate tx-ansrorma` trimmer screws are accessible thrth the small hole in the
top of the intermediate transformer shields.

To align the variable condenser:

l. Connect the high output side of the oscillator to the set antenna lead and the ground
side of the oscillator to the ground lead.

2. Tune the receiver to 1400 kilocyclee on the dial and set the oscillator to this fra-

3. Adjust the variable condenser trimmer screws for maximum output reading.

4. Tune the set to approximately 600 kilocycles on the dial and adjust the oscillator
frequency to 600 kilocycles. Adjust the padding condenser located on the rear of
the chassis adjacent to the antenna and ground leads and accessible through the hole
in the chassis for maximum output reading.

When making this adjustment be sure to rock the variable condenser to the right and
left using the position where .the greatest reading is obtained.

5 Ohm Resistor

8709 Transformer used with 2525 Tube
9582 Padding Condenser

B'llO Transformer used with 84 Tube

9611 Volume Control

8707 Cord dc Plug
8708 HF A Choke

Cable with Plug

.1-.1 MM. Condenser

.5 Mfd. Condenser
8705 8 Mfd. Condenser

107A 52 Volt Power Unit complete with B4 Tube

9907 Three Conductor Power
8701 Vibrator

8706 l Mfd. Condenser

access a.
mm half# WOOD

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