Dyna Dynakit SCA-35 Скачать руководство пользователя страница 1 | Manualshive

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Содержание Dynakit SCA-35

Страница 1: ...SERIAL NUMBER I 15350075 This number must be men tioned in all communica tions concerning Dynakit Price 1 00 STEREO CONTROL AMPLIFIER INSTRUCTIONS FOR ASSEMBLY AND OP ERATION Patented 086315 ...

Страница 2: ...c 2 5 mv at tape head 4 mv at low level magnetic phono 1 volt at high level inputs 35 watts continuous 45 watts IHF Music Power both channels 0 25 db from 20 cps to 20 kc 20 cps to 20 kc without exceeding 1 distortion within 1 db of 17 5 watts each channel Less than 1 at 17 5 watts each channel Less than 0 2 on any input at average listening levels 70 db below rated output on low level inputs 80 d...

Страница 3: ...lose to e same loudness Beneath the volume control is the loudness switch When it is switched to loudness there is additional bass intro duced into the music when the volume control is at the mid point or below At high settings of the volume control the loudness switch has no effect The reason for this fea ture is that the human ear has decreased sensitivity to low frequencies at low volume levels...

Страница 4: ...oing into the recorder In the special case where it is desired to play a multi track tape with a monophonic recording on all tracks 4 through the SCA 35 the track recorded in the opposite direction will come through one channel of the SCA 35 unless one of two expedients is used to prevent this 1 One cable can be removed from the unwanted chann then by using the mono position of the stereo mono swi...

Страница 5: ...se to a tuner or where vertical face up mounting is necessary Under no circumstances should the SCA be stacked immediately above or below the Dynatuner USING YOUR SCA 35 Other Back Panel Connections There are two AC outlets on the back panel to which the wer cords of auxiliary equipment may be connected One these outlets is switched in unison with the SCA 3S when e SCA s power switch is operated T...

Страница 6: ... of the extra speaker It can be used to reduce the level of this speaker to zero and then the stereo speakers will function in their normal way If the control is not added and it is desired to cut out the center speaker to restore normal stereo operation this can be done by re installing the jumper on the back panel This can also be done by adding a switch to connect together the two leads to the ...

Страница 7: ... circuit module These are truly unique circuits in which optimum use is made of the components The first stage is a pentode section of a 7199 tube This is directly coupled to a cathodyne phase inverter Negative dc feedback is taken from cathode to screen to stabilize the dc operating point of this pair A positive feedback loop from cathode to cathode augments the amplification of the stage The cat...

Страница 8: ...oldered to a connection the sym bol S 2 is shown when three 3 wires are to be soldered the symbol S 3 appears etc There may be as many as five 5 wires to be soldered to a connection If no symbol is shown do not solder further wiring will be made to that connection before soldering Components can be identified by comparison with the pictorial diagrams Capacitors are individually marked Resistors wi...

Страница 9: ...lug 2 8 The opposite ends of these wires will ater be connected to the main chassis assembly 2 v1 Twist together a 12 and a 15 f black wire so that they are even at one end Connect one of the match ing ends to power switch lug 1 Connect the same pd of the other wire to power switch lug 2 3 f Cut each lead of the 02 mid disc capacitor to 1 2 f A Connect one lead of the 02 mfd disc capacitor to powe...

Страница 10: ... 7 10 40 onnectone end of a 2 red wire to loudness switch lug 2 S Connect the other end to volume control lug 8 S 2 41 Connect one end of a 21 12 green wire to loudnes switch lug 5 S Connect the other end to vo rme control lug 7 S 2 42 1 5 Connect one lead of a 10 000 ohm brown black orange resistor to stereo mono switch lug 1 Con nect other lead to stereo mono switch lug 4 S 2 43 0 Connect one le...

Страница 11: ...an end of a 101 2 red wire to lug 9 8 2 13 vt Connect one end of a 12 black wire to the pair of short lugs between sockets 9 and 10 8 3 Twist this wire together with the two red wires con nected to lugs 9 and 10 14 onnect one end of an 8 green wire to lug 2 8 2 Bend the free end of this wire to mark it 15 Connect one end of an 8112 green wire to lug 1 Y 2 16 Connect one end of an 11 black wire to ...

Страница 12: ...o see that the markings are correctly located Then twist each of the mounting lugs turn with pliers while holding the capacitor firmly against the wafer from above 12 9 The same procedure as in the preceding step is used to install the two section filter capacitor marked 50 50 in the remaining wafer Note that the symbols stamped in the underside of the capacitor are differently positioned than for...

Страница 13: ...ug B of the four section filter capacitor S 2 ton nect the other end to mounting lug D of the two section filter capacitor 23 0 Connect one end of a 61 z black wire to mounting lug D of the two section filter capacitor S 2 Con nect the other end to eyelet 4 on the PC ll cir cuit board S 24 v Connect one end of a 2Y2 red wire to eyelet 5 on the rear PC lO circuit board S 2 Note one wire is already ...

Страница 14: ...een 8 H 2 green 11 12 2 green 7 14 FINAL ASSEMBLY The top of the selector switch is marked with a red dot With the shaft pointing toward you and the dot at the top a locating lug protrudes from the left front The pictori diagram shows the tenninal numbers and identifies th wafers as A front and B rear Whenever a terminal location has separate lugs on the front and back of the wafer be sure you sol...

Страница 15: ...ur section filter capacitor 8 3 Place this wire against he rear panel r1 32 11 Connect one of the green wires from the left hum control to lug 1 of terminal strip T8 2 8 4 Connect the other green wire to lug 2 of T8 2 8 4 Position these wires under the cable clamp 33 V Connect one of the green wires from the right hum control to lug 4 of terminal strip T8 2 8 5 Connect the other green wire to lug ...

Страница 16: ...clockwise is at 6 o clock and the treble control knob set so that full clockwise is at 6 o clock The 12 o clock position will then be the electrically flat setting for each Tum the chassis upside down and shake it vigorously to dislodge any wire clippings or bits of sol er The tubes and the fuse should now be mstalled the pIC torial diagram shows the location of each tube IMPOR TANT When inserting...

Страница 17: ...e the brown with green wires and brown white with green white temporarily to determine whether one of these sets of windings is defective For example if the interchange should make tubes light which were formerly not lighted then there is nothing wrong with the wiring to the tubes hut most probably there is something wrong with the wiring from the transformer which should be returned to DYNA Compa...

Страница 18: ...derstood that hum which disappears when associated equipment is disconnected or turned off is not a problem of the SCA 35 18 Hum which persists after other equipment is eliminated as a source of trouble is generally a result of either faulty wiring or a faulty tube Wires which are not positioned as shown in the diagrams may be a cause of hum This particularly true for the wires which lead from the...

Страница 19: ...ohms 1 watt 5 120 000 ohms 5 27 000 ohms 1 watt 5 R 18 R19 R20 R21 R22 R 23 R24 R25 R26 R27 R 28 R29 R30 R 31 R32 R33 R34 1 2 megohms 150 000 ohms 1 watt 5 5 600 ohms 5 120 ohms 1 watt 5 120 ohms 1 watt 5 1 2 megohms 47 000 ohms 390 ohms 18 000 ohms 5 100 000 ohms 5 47 000 ohms 1 5 megohms 1 2 megohms 150 000 ohms 1 watt 5 5 600 ohms 5 120 ohms 1 watt 5 120 ohms 1 watt 5 R 1 R 2 R 3 _i R 7 R 8 R 9...

Страница 20: ...ms lum control l OOO ohms 1 12AX7 ECC 83 2 12AX7 ECC 83 3 7199 4 7199 5 6BQ5 EL 84 6 68Q5 EL 84 7 68Q5 El 84 8 6BQ5 El 84 IART 5 6 7 8 9 i 3 10 0 25 At U 7 0 70 55 AC 0 360 0 3 365 At 315 IL CONNECTIONS THEREFORE lOJ AlAYHAVE VOLTAGES AP V M TO EYELET 12 PC II C23 J 24 _ V L 16il o _ O A 8il c f 8 LK T Q W 111 ce W C22 en 4 Q BLJ J20 z AC v ac 0 Q PA 774 v z v _ t v n f2 16il _ O A ao c 20 ...

Страница 21: ... plate should be protected with a plastic or wax paper covering or it may be removed The unit should be placed in a rugged carton sur rounded by several inches of shredded paper or other soft packing material The original carton in which the ampli fier is supplied is suitable for shipping if the original inserts are properly used Shipment should be made by prepaid EXPRESS where possible repaired k...

Страница 22: ... s ...

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