Massive Audio DB8000 User Manual download pdf (Page 80)

THE

"BRUTE

-70"

(Continued

from page 46)

Fig.

7. If you cannot get the val-

ues specified for R15

and R16, you

can

wire two

resistors in parallel

to

obtain

the desired

wattage and

resistance,

as shown

here.

Note the

almost mirror image

of one

channel

to the other

. . .

they are identical.

D4

RIS

R13

RIO

The chassis improves shielding of the

input stages and minimizes

extraneous

hum and noise pickup. Don't forget the

rectangular cutouts on

top of the chassis

to permit air circulation

around

driver

transistors

Q4 and

Q5.

If you

can't

get 0.33- and 0.27 -ohm,

10-

watt

resistors (R15 and

R16) , you

can

use

two pairs

of

0.68 -ohm, 5 -watt

resis-

tors wired

in

parallel,

as

shown in Fig.

7.

Recheck the

circuit boards

and

the

heat sink assemblies.

Then install and

wire the power

supply

components. In-

stall

the standoff

spacers

for the circuit

boards and

mount the

heat sink assem-

blies, as

well as the

balance of the parts

that go

on the

front of

the

chassis.

Mount the remaining

below-

chassis com-

ponents, and wire

them

in.

Finally, install and

wire

the circuit

Fig. 8. Typical stereo

installation

using hi -fi components. While a

speaker or

speaker

system

can be

connected directly to the amplifier,

a preamp is needed

to

control

and

select

the signals from

a

tuner,

record player, or any other source.

INPUTS

RIGHT

CHANNEL

LEFT

CHANNEL

C9

D6

C8

SAME

AS

LEFT

CHANNEL

boards.

Do not

connect the

base and

emitter leads of power transistors

Q6

and

Q7

just

yet. Use shielded cable be-

tween

input

jack JI and the input con-

nection point

A and

ground on each of

the two

circuit boards.

Be

sure

that

polarities

have

been

ob-

served, that there are

no

accidental

shorts,

that bias jack J2 is insulated from

the

chassis,

and that proper size fuses

are

installed in

the holders. Adjustable

pots R10

and R13 must

be accessible.

Adjustment.

Only two

adjustments per

channel must

be

made

after

the wiring

is

completed. A general -purpose

VOM

will be needed for

this step. If you have

built the two -channel

stereo

version,

ad-

just each channel

separately.

(Continued on page

92)

PREAMP

STEREO

AMPLIFIER

JI

JI

RIGHT

CHANNEL

POWER

SUPPLY

L

LEFT

CHANNEL

117

VAC

86

POPULAR

ELECTRONICS

RIGHT

SPAR

SYSTEM

LEFT

SPAR

SYSTEM

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 115 116

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