Russco Fidelity-pro Manuale utente

STEAM POWERED RADIO.COM

FIDELITY

PRO

FIDELITY

MASTER

MONO

STEREO

PHONO

PREAMPLIFIERS

STEAM POWERED RADIO.COM

~-I

!'<-I

~-I

FIDELITY-PRO

FIDELITY-MASTER

MONO

STEREO

PHONO

PREAMPLIFIERS

WARRANTY

All

Russco products are warranted against defects

workmanship and materials for a period

one year

from

the

date

delivery.

will repair or replace

products which prove

be defective during

the

warranty period provided they are returned

Russco.

Warranty subject

cancellation if

the

opinion

ssco the product has been either unduly tampered

with or modified so as

cause failure bey.ond our

control. No other warranty

expressed

implied.

are not liable for consequential damages.

RUSSCO

ELECTRONICS

FG.,

INC.

5690

Shields

Fresno, Calif. 93727

l->-o

·~

l->-o

STEAM POWERED RADIO.COM

RUSSCO

FIDELITY-MASTER

AND

FIDELITY-PRO

PHONO

PREAMPLIFIERS

DESCRIPTION:

The

Russco

Fidelity-Pro

and

Fidelity-Master phono preamplifiers

are

professional quality,

RIAA

equalized phono playback preamplifiers designed specifically

for

use

in broadcast

and

recording

studios.

All

models feature a self-contained power supply, integrated circuits and a single piece

extruded aluminum

case

designed

for

easy

serviceability. The Fidelity-Pro model offers low

and

high frequency filters

not

available on the Fidelity-Master.

All

models

are

available in either stereo

mono versions

with

unbalanced

balanced (transformer) output. A special feature

all models

the

use

two

integrated circuits

for

each

channel: a

low

noise preamp

unit

coupled

a high

slew-rate

output

unit. This allows

output

levels

+18dBm

into

a 600 ohm line over the

full

audio

spectrum.

The following table

provided

aquick reference

illustrate the features

the different models:

FIDELITY

-MASTER MODELS

FIDELITY

PRO

MODELS

MODEL

FMMU

FMMB

FMSU

FMSB

FPMU FPMB

FPSU

FPSB

,v1ONO

X X X X

STEREO X X X X

FIXED

EQUALIZATION

X X X X

RUMBLE

FILTER

SWITCH X

X X

BOOST

CUT SWITCH X X X X

UNBALANCED

OUTPUT X X X

BALANCED

OUTPUT X X X ' X

PART NUMBER

~018

900-019 900-016 900-017

~014

900-015 900-012 900-013

-1-

STEAM POWERED RADIO.COM

RUSSCO

FIDELITY-MASTER

AND

FIDELITY-PRO

PHONO

PREAMPLIFIERS

SPECIFICATIONS: (All Models Except

Noted)

Frequency

Response:

15,000 Hz, ±

1 dB

IAA

Curve. (Transformer models down

approximately 3 dB at 15 KHz

with

600 ohms load, flat with no load.)

Noise: Equivalent

-108 dBm input at I KHz. (70 dB below NAB standard reference

level

using

Shure M44-7 cartridge.)

Distortion:

Less

than 0.1% THO at +18 dBm

out

into

600 ohms, 20

15,000

. (Transformer

models

less

than

0.1%

at +17.5 dBm

out

into

600 ohms, 30

15,000

Hz,

20 Hz

less

than 0.1% THO at +10 dBm out,

less

than

at +17.5 dBm out.)

Maximum Output Level: +18 dBm

into

600 ohms, +22 dBm no load.

Maximum

Input

Level: 100 millivolts

RMS

at 1KHz.

Input Sensitivity: 1

millivolt

RMS

at 1KHz

for

dBm output.

Crosstalk (Stereo Models Only): Greater than 55 dB down at 15KHz; greater than 65 dB down at

1KHz.

Input Impedance:

47,000

ohms.

Output Impedance: 600 ohms

for

transformer models,

less

than 10 ohms

for

unbalanced models.

Filters (Fidelity-Pro models):

Low Frequency: Flat

Cut: -3 dB at 70 Hz,

-8

dB at 30

Hz.

High Frequency: Boost: +3 dB at 5KHz, +5 dB at 10 KHz,

level

from 10KHz up.

Flat·

Cut:

-3

dB at 4.5KHz,

-6

dB at 7KHz, rolls

off

at 6 dB per octave

above

7KHz.

Power: 117 Volts

AC,

60 Hz, 40 milliwatts.

Size:

11"

long x 4-3/4" wide x 1-3/4" high (including hardware).

Shipping weight: 4 pounds maximum, depending on model.

Operating weight: 2

3 pounds, depending on model.

NOTE:

All

specifications

based

on tests

made

with tone-arm

and

Shure M44-7 cartridge hooked

the preamp.

Signal

driven through cartridge

across

a 100 ohm resistor on the ground

side

the cartridge.

-2-

STEAM POWERED RADIO.COM

UNPACKING

AND

INSTALLATION

UNPACKING:

Remove

the

styrofoam packers from both sides

the

preamp case. No other packing material need

removed.

INSTALLATION:

The preamp may be set free standing on a shelf

may be mounted

any flat surface. Holes for

number six screws are provided

the

base flange. It can be mounted

wood

metal,

but

care

should be taken regarding grounding if mounted

metal. (The case

ground potential.)

When

locating

the

preamp, avoid areas near electric motors

transformers where strong fields may

present.

Ventilation

not

a critical factor due

the

low power dissipation

the

unit,

but

areas

high

ambient temperature (over 120 degrees fahrenheit) should be avoided

assure long component

life.

CONNECTIONS:

INPUT: Plug leads from tone-arm into input jack(s) on front panel. Use standard

RCA

phono

type

ugs

. Connect

tonr

-arm ground lead under

the

ground post screw.

TPUT: Connect

output

leads

the

terminal

st1

ip on

the

rear panel.

For unbalanced models use single

two

conductor shielded line, connecting grounds

the

terminals

marked"

"GND". Connect center

hot

lead

the

terminals

marked"+".

These

models need

not

be terminated

any particular toad,

but

if termi;

--a

ted,

the

load should be no

less

than

600

ohms. If

two

conductor shielded line

used,

the

shield should he grounded

one

end

only.

Balanced models may

connected with

two

conductor twisted line, shielded

unshielded. Connect

wires

terminals

marked"+"

and"-".

The shield can

connected

the

terminal marked

"GND",

but should

connected

one

end only. Balanced models may be terminated with a

600

ohm

re-

sistor

transformer. An increase

high frequency response will result if

the

output

terminated

a high impedance. For long line applications and installations

an environment

noisy fields, it

recommended

that

the

output

transformer center-taps be grounded. See special instructions on

page six for this modification.

POWER

: Insert power cord into any standard 117 VAC,

outlet. There

no power switch

the

preamp and it may

left connected

the

power indefinitely as it draws so little power.

STEAM POWERED RADIO.COM

desired

disconnect

the

power during non-operative periods,

the

preamp may be

connected

a switched

outlet.

CHECK OUT AND CALIBRATION:

Playing any reference signal recording (such as

the

NAB

Test Record

Level

Check Signal) adjust

level controls for

the

desired

output

level. The level controls are accessible through holes

the

front panel.

Use

a small slot

type

screwdriver.

NOTE:

When using an

powered meter

measure

the

output

level of balanced

output

models, take care

that

both

sides

the

measured line are kept above ground. Grounding

one side

the

line may cause false readings. Frequency response tests made using a disc

recording as

the

signal source will display

the

frequency response characteristics

the

cartridge as well as those

the

preamp. Response may

modified

Fidelity-Pro models

by changing

the

high and low frequency switch positions. Balanced

output

models can have

the

high frequency response raised

increasing

the

output

load impedance

some value

above

600

ohms.

CASE

DIFFICULTY:

The following preliminary steps are recommended as a prelude

actually trouble shooting

the

preamp itself.

these steps prove insufficient in solving

the

problem,

the

preamp should

returned

the

factory for repair

serviced

a qualified technical person. See "Servicing

the

Preamp"

pages five

and

six for technical guidelines..··

Preamp does

not

appear

operate. . .

•

1. Check all

exte

connection~.for shorts, broken wires or loose connections.

Check

tone

-arm and ca,rt;ridge connections.

3. Check power cord c

,er

mection. ls-the

the

outlet

turned

onf

4. Check fuse and replace if blown.

High Noise

Hum.

Check all

ound connections

be sure

that

they

are tight.

Move

the

eamp

away

from any field producing objects, such as motors,

lines

transformer

Turn

the

plug over.

4. Try various combinations

grounding

the

turntable,

tone

-arm, preamp chassis and

preamp ground terminals.

5. Some tone-arms

that

have a common ground shielded lead cable can cause ground-loop

problems. It may help

disconnect one

the

grounds

either

the

cartridge

preamp end

the

cable. (This generally applies

stereo installations only.)

STEAM POWERED RADIO.COM

Distortion.

Make sure

that

there are no partial shorts on

the

output

lines.

2. Make sure

that

the

load

the

output

lines

less

than

600

ohms.

the

load

less

than

600

ohms, a series resistor should be

put

the

line

bring

the

preamp

output

load up

600 ohms. The preamp

level

then turned up

overcome

the

loss due

the

series resistor.

SERVICING

THE

PREAMP

DISASSEMBLY:

See figure one, page nine. Remove

the

two

phillips head screws

the

front panel. Grasp

the

panel

both

sides with fingers resting in

the

finger reliefs and pull

the

panel straight forward,

removing

the

circuit board from

the

box. Slide

the

top

panel

out

the

box. The P.C. board

can now be replaced

the

box

for operational testing.

desired,

the

rear panel can

removed from

the

box

a similar manner. The P.

board can

then

be plugged back into

the

cket and

tne

entire unit can be operated outside

the

box.

TESTING:

The use

only high impedance

and

meters

ommended for testing

the

circuitry

the

preamp.

The first

test

performed on a non-operational unit should be for

•

per

voltages. NOTE THAT

THE CIRCUIT USES BOTH POSITIVE AND NEGATIVE

VOLTAGES. METER POLARITY

WILL HAVE TO

CHANGED

WHEN

MOVING THE TEST PROBE FRO.

POSITIVE

NEGATIVE

DC.

All

measurements are made with reference

ground.

After it has been confirmed

that

the

voltages are correct, signal tracing may be used

deter-

mine

the

point

signal loss. The test setup illustrated

figure

two

page

ten

ovides a simple

method

injecting

the

proper level signal

the

input.

A DEFECTIVE INTEGRATED CIRCUIT

SUSPECTED, remember

that

these are highly

reliable devices with a failure rate equal

lower

than

those

other

components

NOT

BLAME

THE TROUBLE

I.C

. UNTIL THE POSSIBILITY OF

EXTERNAL COMPON-

ENT FAILURE HAS BEEN THOROUGHLY INVESTIGATED. If

the

I.C.

proves

the

cause

the

trouble,

should be replaced as follows:

STEAM POWERED RADIO.COM

1. Remove

the

solder from around

all

the

pins

the

I.C.

(The use

a solder removal

tool such as

the

Edsyn "Soldavac"

recommended.

lrons

that

heat

all

the

I.C.

pins

once are

not

recommended.) Make sure

that

each pin

free from

the

P.C. board.

Lift

the

I.C.

from

the

board, bei

careful

not

bend any

the leads or damage

the

body. (It may still be good.)

3. Insert new I.C. and solder leads

P.C. board. Make sure

that

each pin

soldered well

and

that

there are no solder bridges between P.

board pads. Do

not

overheat

the

I.C

during soldering.

PARTS:

The parts list

page seven lists all

the commonly needed replacement parts

that

are available

from Russco Electronics. Many

these parts may be found

local electronics parts houses. When

buying locally, be sure

that

the

correct part

an exact equivalent

supplied.

not

attempt

use "general purpose" devices

"experimenters specials". The factory can supply most

the

parts

the

list in a few days.

RETURNING FOR SERVICE:

Items returned for service should be packed well (preferably

the

original carton) and shipped

prepaid

the

factory. PLEASE

NOT FAIL TO INCLUDE OR MAIL UNDER SEPARATE

COVER A DESCRIPTION OF THE DEFECT. Retu~n c~ari,es rtill be prepaid if the item

warranty.

Out

warranty items will be shipped freight collect

billed.

SPECIAL NOTE ON GROUNDING OUTPUT TRANSFORMER CENTER-TAPS:

order

reduce noise on a balanced

it may be necessary

ground

the

center-taps

the

output

transformers. Remove the circuit board

described under DISASSEMBLY. The trans-

former secondary center-

p lead will be found bundled next

the

transformer winding.

--~

unoccupied

P.C.

pad wi

!:Jnd

the

P.C. board between

the

points where

the

other

two

transformer secondar~ leads are soldered

the

board. Insert

the

center-tap lead

this pad and

solder it

the

unde~ide

the

board. Cut off any excess lead.

WARRANTY

AND

SERI.AL NUMBER

When

ordering parts

sub-assemblies under warranty, be sure

supply the serial number

your

unit. The serial number

will

be found on a label on

the

bottom

the

preamp box.

-6

STEAM POWERED RADIO.COM

PARTS

LIST---

RUSSCO

FIDELITY-MASTER

AND

FIDELITY-PRO

PREAMPS

SCHEMATIC RUSSCO

REFERENCE PARTS DESCRIPTION PART NO. PRICE*

Power Transformer, Wood 7424 108-005 10.35

T2 Output Transformer, Wood 7425 108-006 14.35

01,2,3,4, Rectifier Diode, 1 Amp, 100vPIV, Semtech SIi 130-007 .60

Op,6 Zener Diode, 13v, IW,

5%,

1N4743A 130-010 .65

07,8

Zener Diode, 10v,

1W,

5%,

1N4740A 130-009 .65

IC1

Integrated Circuit Stereo Preamp, National

LM1303N, Motorola MC1303

Fairchild

MuA739

140-002 6.00

IC2 Integrated Circuit Operational Amplifier,

National LM301AN

Analog Devices

AD301AN

140-001 3.30

Fuse,

3/10

Amp

Slow Blow, Uttlefuse 3AG

1/10

101-003 .50

C1,2 Capacitor, Electrolytic, Axial,

500mF/50V

110-016 1.15

C3,4

II II II

1mFnov

110-002 .45

Tantalum, Dipped,

1mF/35V

110-019 .85

C6,

11,

16,

20,21

Ceramic, Di.c, 0.01mF/100V 110-026 .25

C7,

12, 15, 17

Tantalum, Dipped, 10mF/35V 110-017 .85

Ceramic, Disc, 0.005mF/100V 110-025 .25

Mylar,

Axial,

0.001mF/200V/10% 110-020 .45

C10

0.0047mF/200V/10% 110-021 .45

C13

Tantalum, Dipped,

0.15mF/35V

110-018 .85

C14

Mylar, Axial, 0.01mF/200V/10% 110-022 .45

C18

Ceramic, Disc, 5pF/1

110-023 .25

C19

Ceramic, Disc, 10pF/1

110-024 .25

C22

Electrolytic, Axial, 100mF/35V 110-009 .85

R1,2 Resistor, Deposited Carbon, 220 ohm,

½W,

150-006 .

47Kohm,

¼W,

1150-032 .20

820K ohm,

¼W,

1-50

-035 .20

2.2K ohm,

¼W,

150-040 .20

,, ,,

56K ohm,

¼W,

150-042 .20

,, ,,

750K ohm,

¼W,

150-034

.. • '

J•

R8,9

100 ohm,

½W,

150-003

.1'5

R10

6.8K ohm,

¼W,

150-041 .20

R11

Trimpot,

10K

ohm, Linear Taper,

Cermet Element, Bourns 3389S-1-103 150-043 2.00

R12,14 Resistor, Deposited Carbon, 100K ohm,

¼W,

150-033 .20

R13

10K ohm,

¼W,

150-031 .20

R15

,, ,,

22 ohm,

½W,

150-002 .15

-7-

STEAM POWERED RADIO.COM

REPLACEMENT ASSEMBLIES

Rear

Panel

and transformer assembly,

complete, ready

plug in:

For Mono

Preamps,

all models

For Stereo Preamps, all models

Front

Panel

and Printed Circuit Board Assembly,

complete, ready

plug in:

Fidelity-Master, Mono, Unbalanced (FMMU)

" " " Balanced (FMMB)

" "

Stereo, Unbalanced (FMSU)

" "

" Balanced (FMSB)

Fidelity-Pro, Mono, Unbalanced (FPMU)

" " " Balanced (FPMB)

" " Stereo, Unbalanced (FPSU) ·

" " Balanced (FPSB)

Prices

subject

change

thout

notice.

NOTE

OUTPUT IMPEDANCE

BALANCED MODELS:

...,

RUSSCO

PART NO.

400-118

400-117

400-119

400-120

400-121

400-122

400-123

400-124

400-125

400-126

PRICE*

26.75

36.00

45.00

64.00

76.50

114.50

.75

79.75

98.50

136.50

Because

the l~w reflected impedance

the integrated circuit driving the

output

transformer, the

true

output

i,npedance at the secondary

the transformer

less

than the rated 600 ohms. This

' '

q1.

no consequence unlessthe transformer secondary

driving a precision attenuator or

filter

which

requires a 600 ohm source

for

proper operation.

such

applications, place a 270 ohm resistor in

series

with

each

side

the output line. This

will

give

the proper source

for

filter

attenuator inputs.

-8

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