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Bibliography

[1] Kenwood Corporation, “Linear Amplifier Model TL-922A Instruction Manual,” B50-

2587-00 (G).

[2] Kenwood Corporation, “Service Manual TL-922 Linear Amplifier,” B51-0835-00, April,

1994.

[3] Richard L. Measures, “Improving the Heathkit SB-220 Amplifier,”

QST

, pp. 42, Febru-

ary 1989.

[4] Richard L. Measures, “Improving Amplifier Parasitic Suppression for Modern Amplifier

Tubes,”

QST

, pp. 36-38, 66, 89, October 1988.

[5] Richard L. Measures, “Circuit Improvements for the Heath SB-220 Amplifier – Part 1,”

QST

, pp. 25-29, November 1990.

[6] Richard L. Measures, “Circuit Improvements for the Heath SB-220 Amplifier – Part 2,”

QST

, pp. 41-43, December 1990.

[7] Richard L. Measures, “QSK for the TL-922 and SB-220 With Circuit Improvements for

the TL-922,” http://www.somis.org/QSK922.html, October 2004

[8] Richard L. Measures, http://www.somis.org/

[9] Richard L. Measures, “The Nearly Perfect Amplifier,”

QST

, pp. 30-34, January 1994.

www.KesslerEngineeringLLC.com

Содержание TL-922 Revival (tm)

Страница 2: ...io hobby more enjoyable and trust that our products will bring you many years of faithful service We Thank You for the confidence that you have placed in us and in our products 73 Dr Donald J Kessler...

Страница 3: ...4 1 Tools Required 7 3 5 LED Board Installation 9 3 6 Step Start PCB Installation 12 3 7 QSK T R Relay PCB Installation 16 3 7 1 Stock T R Relay Removal 19 3 8 Electronic Bias PCB Installation 24 3 8...

Страница 4: ...al Checkout 32 3 8 7 Electrical Schematics 39 4 Service and Warranty 45 Bibliography 45 5 User Notes 47 5 1 User Notes Continued 48 5 2 User Notes Continued 49 5 3 User Notes Continued 50 www KesslerE...

Страница 5: ...and Terminal Strip Orientation 14 3 9 Stock Fuse Holder Configuration 14 3 10 Step Start to Fuse Holder Connection 15 3 11 Bias Relay Prior to Removal 16 3 12 After Bias Relay Removal 17 3 13 QSK T R...

Страница 6: ...RL CONT to TX connection 31 3 27 Complete Installation of QSK Electronic Bias and Step Start 32 3 28 Electronic Bias ZSAC Adjustment Jumper 36 3 29 Step Start Schematic Diagram 39 3 30 Step Start PCB...

Страница 7: ...vii List of Tables 3 1 TL 922 Revival tm Modification Kit Contents 5 www KesslerEngineeringLLC com...

Страница 8: ...ineering TL 922 Revival tm Kit may download print and retain personal copies of this manual as required to modify their respective TL 922 RF amplifier while utilizing the Kessler Engineering supplied...

Страница 9: ...for a full refund including postage if any of the following apply You are not comfortable working on this amplifier You are not qualified to perform this work You do not fully understand the potentia...

Страница 10: ...well as where to find appropriate sources of parts Another complication arises when one attempts to service a modified amplifier particularly if modified by someone else Depending upon the modifier s...

Страница 11: ...controlled tube bias 7 Non QSK 8 Meter lamps that are no longer available The most significant problems which require immediate attention are items 1 and 2 the amplifier s tendency to oscillate and it...

Страница 12: ...ified TL 922 amplifier The kit comes with all circuit boards assembled and tested Should a fault develop on any of these circuit boards it may be removed and serviced If necessary they may also be ret...

Страница 13: ...6 Figure 3 1 TL 922 Revival tm Upgrade Kit Contents www KesslerEngineeringLLC com...

Страница 14: ...s well as mechanical layout of the amplifier prior to performing any work on the amplifier Copies of these manuals are available from various sources on the Internet quite often as a cost free downloa...

Страница 15: ...ed from the amplifier No Exceptions Under no circumstances should the amplifier be plugged into electrical power switched On etc while performing any of these modifica tions Unplug the amplifier from...

Страница 16: ...liding them upward Cut or desolder the lamp wires from the grounding post Remove and discard the Standby and On Air lamps sliding them sideways as necessary Remove but retain the two screws holding th...

Страница 17: ...and the meters Inserting this Diffuser will provide uniform illumination of the meters and prevent bright spots Check the orientation of the On Air and Standby LEDs They should point toward their resp...

Страница 18: ...11 Figure 3 4 LED Circuit Board Correctly Installed www KesslerEngineeringLLC com...

Страница 19: ...tart circuit in series with the AC Mains fuses and the front panel On Off switch Installation Remove the four screws holding the fan enclosure Figure 3 5 Remove the enclosure exposing the mains adjust...

Страница 20: ...the 22 twisted pair and its 2 pin receptacle downward near the SO 239 RF Output connector then toward the front of the amplifier Figure 3 7 Inserting Step Start PCB and Routing Wire Leads Re install t...

Страница 21: ...mains fuse holders are shown in Figure 3 9 Figure 3 9 Stock Fuse Holder Configuration With the amplifier and fuse area oriented as shown in Figure 3 9 de solder and remove the white 14 wire emerging f...

Страница 22: ...from the Step Start PCB to the upper terminal of the right fuse holder Solder together the free end of 14 white wire to the other yellow wire Insulate with Heat Shrink tubing Route the 22 twisted wire...

Страница 23: ...nectors as shown in Figure 3 11 Figure 3 11 Bias Relay Prior to Removal Cut the plastic wire ties or string ties in older TL 922 amplifiers holding the grey coaxial cables to the wiring harness Do NOT...

Страница 24: ...ust be retained Ensure that the wire running from the filament transformer CT terminal is connected to the filament choke as shown to the far left in Figure 3 12 When finished there should be a small...

Страница 25: ...r Orient and place the QSK T R Relay PCB over the chassis opening Fasten securely with two metal screws Solder the exposed leads from the QSK T R Relay PCB to the RF Input and RF Output SO 239 connect...

Страница 26: ...gure 3 14 Stock T R Relay Prior to Removal Carefully unsolder and remove the RF choke it will be reinstalled later Remove the two screws holding the T R relay Cut any wires where they connect to the r...

Страница 27: ...ve to the amplifier and must be connected to the amplifier s tuned input network Refer to Figure 3 16 on page 21 Solder the shorter coaxial cable s braid to the ground post near the tuned input con ne...

Страница 28: ...he RF Choke to the ground post on the side of the amplifier near the output band switch This is the same post that the coaxial cable shield is soldered to Solder the free end of the RF choke to the co...

Страница 29: ...22 Figure 3 17 QRO Output to Coax Connection Figure 3 18 RF Choke to Bandswitch Connection www KesslerEngineeringLLC com...

Страница 30: ...23 Figure 3 19 QSK PCB to QRO Output Connections www KesslerEngineeringLLC com...

Страница 31: ...ns former as shown in Figure 3 20 This area will be used to hold the Electronic Bias PCB Figure 3 20 Zener Bias Diode Prior to Removal Cut the brown wire where it attaches to the Zener diode This is t...

Страница 32: ...it However Figure 3 21 does show how the filament supply leads might appear if they were replaced during the filament voltage modification Add a 0 01uF capacitor between the filament transformer C T C...

Страница 33: ...he filament trans former Place the rubber grommet as shown it will be compressed and held in place by the Electronic Bias PCB Orient the Electronic Bias PCB and lower onto the filament transformer mou...

Страница 34: ...27 Figure 3 23 Electronic Bias PCB Installed www KesslerEngineeringLLC com...

Страница 35: ...PTT control RCA jack labeled RL CONT RY QSK Relay PCB already connected GND Chassis ground connection 3 8 4 IG Electrical Connection The brown IG wire will be used to pull the Electronic Bias IG wire...

Страница 36: ...Please refer to the orientation of the connecting wires shown in Figure 3 23 as a guide CT Electrical Connection Solder the CT wire lead to the filament transformer CT terminal The CT terminal is the...

Страница 37: ...as the bias control circuitry As mentioned previously the label for the 8V winding may be partially obscured by the transformer warning label However the 8V windings are the two terminals shown on the...

Страница 38: ...he QSK T R Relays This wire is already soldered to the QSK T R Relay PCB RY terminal GND Electrical Connection Solder the GND lead to the filament transformer E ground terminal The filament transforme...

Страница 39: ...tc At this point the amplifier should appear as shown in Figure 3 27 NOTE This Figure shows an additional modification to lower the filament voltage a modification to the grid circuitry as well as mod...

Страница 40: ...fier is switched On the AC mains current flow is limited briefly by the two power resistors on the Step Start PCB After a brief interval approximately 2 seconds the Electronic Bias PCB circuitry will...

Страница 41: ...on 4 Confirm that neither ON AIR nor STBY lights is illuminated 5 Change the amplifier LINEAR switch from STBY to OPERATE Confirm the STBY light is now illuminated 6 Electrically short the Open end of...

Страница 42: ...pen end of the keying line cable Confirm loss of DC continuity between the center pins of the RF INPUT and RF OUTPUT connectors 7 Measure DC resistance between center pin of the RF INPUT connector and...

Страница 43: ...he 3 500Z vacuum tubes may be operated upright or upside down However the tubes may not be operated when oriented horizontally The tests may only be performed with the amplifier either upright or upsi...

Страница 44: ...the LINEAR switch to STBY 4 While observing the HV meter switch the amplifier ON Confirm Step Start Operation Confirm HV ramps up initially plateau then reaches approximately 2kV after Step Start Rela...

Страница 45: ...e approximately 180mA MODE switch to SSB To do so unplug the amplifier from the AC mains Wait approximately 30 minutes for the HV to bleed off then move the bias jumper in the appropriate direction to...

Страница 46: ...39 3 8 7 Electrical Schematics Figure 3 29 Step Start Schematic Diagram www KesslerEngineeringLLC com...

Страница 47: ...40 Figure 3 30 Step Start PCB www KesslerEngineeringLLC com...

Страница 48: ...41 Figure 3 31 QSK T R Relay Schematic Diagram Figure 3 32 QSK T R Relay PCB www KesslerEngineeringLLC com...

Страница 49: ...42 Figure 3 33 LED Schematic Diagram Figure 3 34 LED PCB www KesslerEngineeringLLC com...

Страница 50: ...43 Figure 3 35 Electronic Bias Schematic Diagram www KesslerEngineeringLLC com...

Страница 51: ...44 Figure 3 36 Electronic Bias PCB www KesslerEngineeringLLC com...

Страница 52: ...ur service department for return authorization and shipping instructions prior to sending any product for service or repair All items shipped to Kessler Engineer ing must be packed appropriately and i...

Страница 53: ...Amplifier Tubes QST pp 36 38 66 89 October 1988 5 Richard L Measures Circuit Improvements for the Heath SB 220 Amplifier Part 1 QST pp 25 29 November 1990 6 Richard L Measures Circuit Improvements fo...

Страница 54: ...47 User Notes www KesslerEngineeringLLC com...

Страница 55: ...48 5 1 User Notes Continued www KesslerEngineeringLLC com...

Страница 56: ...49 5 2 User Notes Continued www KesslerEngineeringLLC com...

Страница 57: ...50 5 3 User Notes Continued www KesslerEngineeringLLC com...

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