Dynaco Dynakit Mark IV Owners Manual

Page 1

SERIAL NUMBER

This number must be men-
Iioned in all communica-
tions concerning Dynakii.

INSTRUCTIONS FOR ASSEMBLING
DYNAKIT MARK IV

Price 5/. 00

DYNA COMPANY 3916 POWELTON AVE.
PHILADELPHIA 4. PA.

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Page 2

SPECIFICATIONS

Power output: 40 watts continuous, 90 watts peak

IM distortion: less than 1,, at 40 watts, less than
35% at 1 watt

Frequency response: i :5 db from 10 cps to 40 kc;
: 5 db from 20 cps to 20 kc at 40 watts output

Power response: 20 cps to 20 kc without exceeding
1% distortion within 1 db of 40 watts

Sensitivity: 1.3 volts rms input for 40 watts output

Hum and Noise: Inaudible; 90 db below 40 watts
(choke filtering)

Dumping Factor: 15

Output lmpedunces: 4, 8 and 16 ohms
Tubes: ELr34 (2). 7199, GZ-34, selenium rectifier

Finish: bright nickel chassis, vinyl coated charcoal
brown cover

Special Features: Matched tubes, Dyna Biaset for
nonicritical adjustment, preamp power socket, fuse
post, on-ofi switch

Power Consumption: 115 watts

Size: 5 x 14 x 61/2 high

Weight: 20 pounds

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Page 9

antee period, DYNACO will replace any non-stand-
ard parts at net prices. Many of the components are
standard items which can be purchased from most
electronic supply stores.

If transformers are returned for factory repair or
replacement, they should be removed from the equip-
ment without cutting leads short If leads are cut
rather than unsoldered so that they are unusable, the
transformer guarantee is void.

In the event the assembled kit does not function
properly or breaks down after use, DYNACO will
service the kit for a fee of $500 plus the cost of parts
which have been damaged or are past guarantee This
service facility is not available for kits which are in-
completely wired or which have been wired with other
than rosin core solder, or in which changes have been
made without factory authorization. In addition, NO
PARTS WILL BE REPLACED NOR WILL ANY
SERVICE BE RENDERED FOR KITS WHERE
THE GUARANTEE POST CARD HAS NOT
BEEN RETURNED THE SERIAL NUMBER
ON THIS INSTRUCTION BOOK MUST BE
MENTIONED IN CORRESPONDENCE, PARTS
RETURN, OR KITS RETURNED FOR FACTO-
RY SERVICE. It is the factory prerogative to limit
the service facility to one year from date of purchase.

When shipping a unit for service, a note must be
attached specifying symptoms, the name and address
of the sender, and the serial number of the unit. The
amplifier should be securely packed with stuffing in,
side the cover to prevent the tubes from coming out

of their sockets in shipment. It should be placed in a
rugged carton and surrounded with plenty of shock
absorbing packing material The original carton is
not suitable for shipping an assembled amplifier,

Shipping should be by Railway Express, prepaid;
repaired kits will be returned by Railway Express
collect for shipping and service charges unless these
are prepaid. Parcel post is not a safe method of ship-
ment for assembled units.

Dyna Co. assumes no responsibility or liability for

damages or injuries sustained in assembly or opera-
tion of the DYNAKIT.

MARK IV VOLTAGE CHART

VI rectifier G234 V2 & V3 EL34 V4 7199

Pin

1 1.56 DC 290 DC

2 440 DC fi 140 DC

3 ~~~ T 432 DC a 42 DC a
4 370 AC 3 432 DC L: - 'w
5 .7 > 434 D(* > _:
6 370 AC ('1 7 ~ 1.5 DC ~
7 i g D

8 440 DC 1.56 DC 145 DC

9 140 DC

*This negative voltage must be measured with a
VTVM only.

All measurements on this chart were made with a
VTVM. Other types of meters may give a lower indi-
cation in some cases.

PARTS LIST

Parts of similar type which do not change performance may sometimes be included as a
matter of expediency. This will account for slight variations in value and appearance.

Chassis set (including cover and bottom plate)
Power transformeerAJBiS
Output transformermA7470
(hokeircfiffit

Output tuljesr EL734 6(A7
Rectifier tube 7 (1234 5AR4
Driver tube 7777199

Octal sockets

Printed circuit assemblyiPC-4
Filter capacitor (quad ((3 525 Voltsu
Capacitors (50 MFD}

Selenium rectifieriCube

Four screw terminal strip

Fuse post with rubber washer and mounting nut
Fuse 2A

Line cord

Switchm SPST

Input socket

Potentiometere 710,000 ohms

Five lug terminal strip

Hank of wire

r-I-At-p-A-Ab-b-flV-Ht-NHD-br-V-Mp-Iu-l-AH

RESISTORS

135 ohm precision

1000 ohm ( brown-black-red)
10,000 ohm l brown-black-orange)
10 ohm « brown-black-blacki

6800 ohm t bluegrey~redl

22.000 ohm v rediredrorangel

-~mw~

Solder lug

3/3 nut

3/g lockwasher

Cable clamp

#8 machine screws
#8 lockwashers
#8 nuts

19 #4 machine screws
16 #4 lockwashers
17 #4 nuts

4 Rubber feet

1 Rubber Grommet

4 Sheet Metal Screws #6
1 Set of instructions and warranty card

meson-flu...

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