4
3.2
Shortcomings in the Stock TL-922
TL-922 in its stock configuration has a number of impairments that adversely affect its
operation and longevity. Some of these include:
1. Parasitic Oscillation
2. Excessive Filament Voltage
3. High Voltage / High Current PTT Switching
4. Excessive In-Rush Current
5. Loud, Hot-Switching T/R Relay
6. Slow, relay-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 its excessive filament voltage. Both of these problems
are well described and resolved via an upgrade kit that had been available directly from
AG6K[8]. If left uncorrected, these problems greatly affect amplifier reliability resulting in
premature failure of the 3-500Z vacuum tubes which are increasingly expensive.
www.KesslerEngineeringLLC.com
Содержание TL-922 Revival (tm)
Страница 7: ...vii List of Tables 3 1 TL 922 Revival tm Modification Kit Contents 5 www KesslerEngineeringLLC com...
Страница 13: ...6 Figure 3 1 TL 922 Revival tm Upgrade Kit Contents www KesslerEngineeringLLC com...
Страница 18: ...11 Figure 3 4 LED Circuit Board Correctly Installed www KesslerEngineeringLLC com...
Страница 30: ...23 Figure 3 19 QSK PCB to QRO Output Connections www KesslerEngineeringLLC com...
Страница 34: ...27 Figure 3 23 Electronic Bias PCB Installed www KesslerEngineeringLLC com...
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 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...
