AMERITRON AL-572 Instruction Manual Download Page 38 | Manualshive

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Summary of Contents for AL-572

Page 1: ...velope Power vs Average Power 6 Circuit Descriptions 7 ALC 7 Dynamic Bias 7 Wattmeter Circuit 8 Power Supply 8 Filament Supply 8 Plate HV Supply 8 Meters 8 Current Meter plate and grid 8 Multimeter 9...

Page 2: ...ear panel 19 Driving Power 20 Tube and Component Life 20 Tuning 21 Tuning Procedure 22 ALC SET control 24 Additional SSB Notes 25 AM Amplitude Modulation Operation 25 Audio Distortion 25 FM Frequency...

Page 3: ...adjustable true ALC circuit and automatic bias switching to make this the best featured and most reliable 572B amplifier available The AL 572 and AL 572Y are factory wired for 120 volt 50 60 Hz ac lin...

Page 4: ...s holes Firmly press the tubes into the socket Do NOT twist or force the tubes into their socket Install the anode connector on the tube s anode terminal Install the fuses and fuse caps on the back of...

Page 5: ...Ameritron AL 572 Instruction Manual 3...

Page 6: ...anges The AL 572 has two illuminated cross needle panel meters The left meter provides a continuous reading of grid and plate currents The right meter reads peak RF power output on one scale and Plate...

Page 7: ...0 watts nominal 1 2 hour PEP two tone test 1000 watts 1 2 hour continuous carrier RTTY not rated contact factory for specification Frequency Coverage 1 8 to 21 MHz amateur bands Export models include...

Page 8: ...timeter Peak forward power continuously The second scale switches between peak reflected power and SWR ALC threshold ALC output voltage and high voltage Current meter Plate and grid current simultaneo...

Page 9: ...de the amplifier operate at high enough temperatures to cause burns 7 NEVER make any unauthorized component or circuit modifications to this product The only acceptable source for modifications is Ame...

Page 10: ...begin on page 17 DYNAMIC BIAS Conventional bias circuits force high power linear amplifiers to dissipate hundreds of watts during low or no signal periods This creates needless heat since virtually no...

Page 11: ...a heavy duty 21 pound transformer Filtering is accomplished by a bank of high quality computer grade capacitors totaling 26 mFd Large 50k ohm 7 watt bleeders are used for safety and superior voltage...

Page 12: ...ale FWD This scale is calibrated in 100 watt steps up to 2 kW The right hand scale of this meter provides four metering functions that are selected by the MULTIMETER switch These functions include the...

Page 13: ...emperatures normally do NOT produce anode color The graphite anode is coated or mixed with a getter material that de gasses the tube This material is activated by normal operating anode temperatures T...

Page 14: ...eding 1100 mA will not cause loss of emission or shorten the amateur service life of the tubes in this amplifier The application of filament voltage causes thermal stresses from rapid and uneven tempe...

Page 15: ...ly For service or written correspondence use the following address AMERITRON 116 Willow Rd Starkville MS 39759 Telephone 662 323 8211 FAX 662 323 6551 Note Service history has clearly shown that most...

Page 16: ...ortant to avoid restricting the air inlet 2 The exhaust airflow is over 30 CFM Do not assist the exhaust airflow with cabinet mounted fans 3 The most efficient way to improve airflow is to pressurize...

Page 17: ...ashing with stainless hose or pipe clamps for the jumpers The following tips will help prevent lightning damage and RF grounding problems 1 Avoid using braided or woven conductors they have very high...

Page 18: ...ansformer of the AL 572 has fourteen different voltages available on the primary and is rated at full power on frequencies of 50 and 60 Hz The jumper connections chart below indicates the proper place...

Page 19: ...he rear panel provides 12 Vdc at 200 mA maximum to operate external dial lamps or accessories such as the ATR 15 Antenna Tuner 6 Connect the ALC jack to the ALC input of the exciter with a shielded ca...

Page 20: ...control is rotated beyond the point of maximum output The linearity however will increase The proper position for this control is slightly clockwise from the setting that produces maximum output with...

Page 21: ...output power however The fullness of ALC action is indicated by the meter reading in the multimeter ALC position More exciter audio gain or power output will drive the amplifier s ALC circuit harder...

Page 22: ...ill automatically self adjust to the value required by the exciter If the ALC voltage requirements are low and or if the ALC attack time is slow the ALC may cause the output power to pump at a very sl...

Page 23: ...er if this condition occurs Non linear operation splatter and excessive grid current will occur if the LOAD setting is too low Excessive plate current is the proper indicator that the drive power limi...

Page 24: ...ltage and arcing in the tank circuit or excessive grid current Repeated tripping of the grid overload circuit or intermittent arcing probably indicates the LOAD control is adjusted too low The goal of...

Page 25: ...proper voltage outlet 3 Place the main power switch in the ON position The meter lamps should light and the blower should start Read the 3500 volt scale on the multimeter It should indicate 2800 volts...

Page 26: ...utput to the exciter s ALC input Steps 10b and 11b should be used if the exciter and amplifier ALC lines are not connected Note Step 10 requires the simultaneous observation of the plate current Ip an...

Page 27: ...is adjusted until the multimeter ALC position indicates the desired ALC level This setting should normally allow around 120 mA grid current on a steady carrier or whistle Note If the ALC is not conne...

Page 28: ...nt For the cleanest audio the microphone gain can be reduced until the ALC meter just flickers AM AMPLITUDE MODULATION OPERATION The efficiency of any conventional linear amplifier must remain below h...

Page 29: ...than vacuum relay systems they will allow over 90 of the available receive time to be used at 60 WPM Ameritron highly recommends using the external QSK 5 switch This stand alone PIN diode switch can...

Page 30: ...equipment failure or personal injury The cover should be removed and a low value 40 to 500 ohm two watt or larger resistor should be secured to the chassis The other end of this resistor should be con...

Page 31: ...200 2122 C133 2200 uF 25 V 203 0207 C134 220 uF 25 V 203 0565 R101 4 7k mox 1 W 103 1747 R102 470k 1 4 W 100 0188 R103 104 121 10k 1 4 W 100 4100 R105 10 ohm 1 2 W 100 0727 R106 1 5 ohm 2 W 1 103 340...

Page 32: ...20 30 330 9 75T 405 1097 220 208 5175 15 17 270 8 75T 405 1087 180 208 5396 10 12 100 3 75T 405 1037 C217 68 pF METER BOARD 50 0057 3 Designator Description Ameritron PN D301 1N34A 300 0346 C301 302 4...

Page 33: ...5 6 V zener 301 710 IC501 LM 358 dual op amp 311 0724 Q501 NPN transistor MJF3055 305 3055 Q502 PNP transistor 2N3906 307 0722 Q503 504 NPN transistor 2N3904 305 0645 R501 503 10k 1 2 W 101 0643 R504...

Page 34: ...2 50 0080 3 Metering Board Assembly 50 0572 3 50 0080 4 RF Tank Board Assembly only parts L1 L2 50 0572 4 50 0080 5 Timer Overload Board Assembly optional See page 31 50 0572 5 L1 L Coil 10 13165 L2 L...

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