7
3.4
Preparation
We
highly
suggest performing these modifications on a fully functional amplifier. If the am-
plifier is non-functional, we suggest repairing the damage (if appropriate) before commencing
the modifications. Problems due to a defective T/R relay, shorted Zener bias diode, defec-
tive bias relay, inoperative meter lamps, etc., may be ignored since these components are
removed and discarded during the modification process. However, other problems such as
defective tubes, bad high-voltage power supply, etc., will not be cured by merely installing
this modification kit and should be resolved first.
The TL-922 Instruction Manual [1] and the TL-922 Service Manual [2] are excellent ref-
erence documents and one should consult them and become very familiar with the electrical
as 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 download.
The hardware upgrade kit entails installation of four printed circuit boards (PCB), mak-
ing connections to those circuit boards and soldering to various components within the
amplifier. Before these PCBs can be installed, the amplifier must be partially disassem-
bled (not that daunting), and a number of components and assemblies removed from the
amplifier.
The four circuit boards to be installed are:
•
LED – Front Panel Display and Meter Illumination
•
QSK – T/R Relays
•
Step-Start – AC Mains Current Limiting
•
Electronic Bias – Control of tube Bias, Step-Start, QSK, LED, and Soft-Switching.
3.4.1
Tools Required
•
#2 Phillips Head Screwdriver
•
#2 Right-Angle Drive Phillips Head Screwdriver
•
Wire Cutters
•
Wire Strippers
•
Small Needle-Nose Pliers
•
Small Vise-Grip Pliers
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...
