DYNACO Stereo 70 Montaj Talimatları - Sayfa 8

Amplifikatör DYNACO Stereo 70 için çevrimiçi göz atın veya pdf Montaj Talimatları indirin. DYNACO Stereo 70 16 sayfaları. Series ii tube amplifier
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(t/f"

Con n e c t one end of a 10 ohm, (brown-

black-black),

e sis tor to eyelet #8 (8).

Connect the other end to pin #3 of the left

power takeoff socket (8).

60 (,;/) Twist a pair of 3-1/2" wires together and

connect one pair of ends to eyelets #4 (8)

and # 5 (8). Connect the other pair of ends

to pins #1 (8) and #2 (8) of the left power

takeoff socket.

61 (vj Connect one end of a 2-1/2" wire to eyelet

#2 (8),

Connect the other end to pin #6 of

V3 (S).

62 (0 Connect one end of a 3-1/2" wire from

eyelet #1 (S).

Connect the other end to pin

#6 of V2 (8).

63 (I/) Connect one end of a 2-1/2" wire to eyelet

# 6 (S).

Connect the othe

end to lug

2 of

the left potentiometer (S).

64 (V) Connect one end of an 8" wire to pin #4 of

V3 (8).

Connect the other end to eyelet

# 11 (8).

It is important to keep this wire

close to the chassis and carried around the

printed c i r cui t board, as shown in the

pictorial.

Connect one end of a 5" wire to eyelet #9

(8).

Connect the other end to solder lug

near filter capacitor.

66 (r/) Connect one end of a 12" wire to lug # 1 of

the left screw terminal strip (S).

Connect

the other end to eyelet #12 (S).

See

pictorial.

("1

Connect one end of a 10-1/2" wire to lug

#4 (S) of the- teft screw terminal strip.

Connect the""'other end to the solder lug

near filter capacitor.

«(.))

Connect one end of a 9 -1/2" wire to lug # 1

of the right screw term ina 1 strip (S).

Connect the other end to eyelet # 13 (8). See

pictorial.

69 (e-j Connect one end of a 9" wire to lug # 4 (8)

of the right screw terminal strip.

Connect

the other end to solder lug near capacitor.

(v) Connect short link of wire from capacitor

ground lug (8) to solder lug near capacitor.

Solder all six wires which go to the pair of

solder lugs.

71 ( ) Insert the line cord through the grommet in

the rear of the chassis. Pull through about

five inches, tie a knot and then pull from

the outside till the knot is a g a ins t the

grommet.

Separate the two conductors of

the line cord to the knot then strip about

1/2" of insulation from each end.

Connect

one end to lug B of the fuse post (S).

Con-

neet the othe

end to lug # 2 of the on -off

switch (S).

This completes the wiring of

your amplifier.

is wise to go back and check all connec-

tions for correctness and for good solder-

ing. All hardware should also be checked

for tightness.

The fuse can now be

in-

stalled in the fuse post on the rear of the

chassis. The four rubber feet should then

be pushed into the four holes in the bottom

plate - from outside tow a

d inside and

seated with a twisting motion.

INITIAL ADJUSTMENT

Plug in the EL-34 tubes V2, V3, V6 and V7.

Also plug the 7199 tubes into pI' in ted circuit

sockets. Do not plug in GZ-34 rectifier tube. If

h m met e

is available, measure resistance

from capacitor lug #2 to ground. This should be

in excess of one hundred thousand ohms. Inspect

wiring to make sure that all joints are soldered

and that no parts are shorting together.

Plug line

cord into 117 volt ac line and turn on switch.

While tubes are warming up, set the bias adjusting

potentiometers to the c en tel' of their rotation.

This is approximately the correct setting and can

serve as an emergency operating adjustment if no

test instruments a I' e available.

WE V E R,

OPERATION WITHOUT CORRECT BIAS ADJUST-

MENT 18 NOT RECOMMENDED A8 IT RE8ULT8

IN POOR PERFORMANCE AND PROBABLE

DAMAGE TO COMPONENTS.)

Your D y n a kit includes Dyna Biaset (patent

pending) which greatly simplifies setting of the

bias voltage. This can now be done with the most

simple and inexpensive types of dc meters as long

as they have a rating of 1000 ohms per volt or

higher. The correct setting of the bias provides a

total cathode current for each pair of EL-34 tubes

of 100 mao

This current through the precision

15.6 ohm resistors produces a voltage drop of

exactly 1. 56 volts dc, and this v

age can be

checked at pin #8 of each preamplifier power take-

off socket.

1. 56 volts is also the voltage which is

furnished by a "0" type flashlight dry cell .. Thus

any fresh cell of this type can be used for an

accurate reference standard for bias setting.

The procedure for setting the bias is to meas-

ure the voltage output of a "D" type dry cell and

note the meter reading. Then insert the positive

meter probe in the pin #8 hole of the left pream-

plifier power socket (note that outside the chassis

the pin n u m bel's are counted counterclockwise

from the keyway while inside the chassis they are

counted clockwise).

The negative met e r probe