SERIAL NUMBER 8[ 0'.'-. . /, Jt, .•~ '~.J.' f'") This number must be mentioned in all communications concerning Dynakit. INSTRUCTIONS FOR ASSEMBLING DVNAKIT MARK IV Price PATENTED 3060 JEFFERSON STREET PHILADELPHIA, PA. 19121 $1.
SPECIFICATIONS Power output: 40 watts continuous, 90 watts peak Output Impedances: 4, 8 and 16 ohms 1M distortion: less than 1% at 40 watts, less than .05% at 1 watt Tubes: EL-34 (2), 7199, GZ-34, selenium rectifier Frequency response: ± .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.
INSTRUCTIONS FOR ASSEMBLING DYNAKIT MARK IV DESCRIPTION The Mark IV Amplifier uses a circuit arrangement based on that of the Dynakits Mark II and Mark III which have become world famous for superior quality while essentially simple and trouble free. The new 7199 tube is used as a pentode high gain voltage amplifier directly coupled to a cathodyne phase inverter. All parameters are adjusted for minimum distortion.
Refer 1 ( ) Mount the four octal sockets with #4 screws, nuts, and lockwashers (the smallest screws supplied). Note that there is a small slot or keyway in the center hole of each socket; be sure in each instance that this keyway is properly oriented as shown in the pictorial diagrams. Insert the screws from the top of the chassis and mount the sockets from the inside. Fasten each screw with a nut and lockwasher. Mount the input socket from the inside of the chassis using #4 screws, nuts, and lockwashers.
(S). Connect the blue lead to pin #3 of V3 (S). Connect the green lead to pin #4 of V3. 11 Connect one end of a 10,000 ohm (brown-black-orange) resistor to lug #5 of the five lug strip. Connect the other end to lug #1 of the 10,000 ohm bias potentiometer (S). 12 Connect the positive (+) end of the selenium rectifier to lug #4 of the five lug strip (S). Connect the negative (-) end to lug #5 of the strip. 13 Connect the negative (-) end of a 50 mfd bias capacitor to lug #5 of the five lug strip (S).
32 Connect one end of a 7" wire to lug #4 of the four screw terminal strip (8). Connect the other end to eyelet #3 (8 l. 33 Connect one end of a 1000 ohm (brownblack-red) resistor to eyelet #9 (8). Connect the other end to pin #5 of socket V3 (8) . 34 Connect one end of a 3 1h" wire to lug #2 of the bias potentiometer (8). Connect the other end to eyelet #11 (S). 35 Connect one end of a 1000 ohm (brownblack-red) resistor to lug #5 of V2 (8). Connect the other end to eyelet # 10 (8).
amplifier and the Heathkit W A-P2. Should other units with different power plug wiring be used the takeoff socket may be rewired to suit requirements. The wire jumper between lugs #2 and #3 of the 5 lug terminal may have to be cut depending on the type of preamp to be used. This jumper should be cut for use when powering a Dynakit PAM-l preamplifier or Heathkit WA-P2 or any other preamplifier which requires power from a "floating" or ungrounded heater supply.
antee period, DYNACO will replace any non-standard parts at net prices. Many of the components are standard items which can be purchased from most electronic supply stores. 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.
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PA-135 QUAD CAPACITOR BIAS POTENTI OMETER J / / .
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