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Beautifully constructed amplifiers. Unfortunately, are not suited for high speed T-R switching, a necessary attribute for operating AMTOR, QSK-CW, or SSB-VOX modes.

Allow 9 bands and 1300 Watt output on the TL-922 amplifier with this document by PA0FRI

Presents the official service manual for the **Kenwood TL-922** and **TL-922A** HF linear amplifiers, offering comprehensive technical documentation essential for maintenance and repair. This resource includes detailed circuit diagrams, block diagrams, parts lists, and alignment procedures for optimal performance. It covers critical sections such as the high-voltage power supply, RF deck, and control circuitry, providing specific values for components and test points. Operators and technicians utilize this manual to troubleshoot common issues, perform routine adjustments, and understand the intricate design of these classic tube-based amplifiers. It outlines steps for bias adjustments, neutralization, and power output calibration, ensuring the amplifier operates within specifications across the 160-10 meter amateur bands. The document also details safety precautions for working with high voltages present in the amplifier.

by Richard L. Measures, AG6K

1500 watts PEP output from a Kenwood TL-922 amplifier requires careful attention to parasitic suppression and component selection to ensure stability and longevity. This resource critically examines common modifications, often based on anecdotal evidence rather than sound engineering principles, that can degrade performance or introduce new issues. It highlights how replacing aged components often gets misattributed to the efficacy of unnecessary modifications, leading to widespread misinformation within the amateur radio community regarding amplifier stability. The article details specific, effective modifications for the TL-922, such as shortening anode-to-chassis and anode-to-grid paths to improve VHF stability and efficiency. It addresses issues like incorrect capacitor types in the tank circuit, inadequate grid grounding, and poor RF sheet metal design, providing practical solutions like adding direct ground connections for the plate tune variable capacitor. The author also discusses proper parasitic suppressor design, emphasizing the importance of lead length and component selection for optimal performance and harmonic suppression, contrasting these with less effective or detrimental 'magical suppression kits'.

Dovetron modification for the Kenwood TL922A

Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.

Donwload the Kenwood TL-922A user Manual

Collection of Kenwood TL-922 linear amplifier modifications

Changing band selector to a Kenwood TL-922 power amplifier by IW1PUR in italian

K5DKZ review of the Kenwood TL 922A

A forum thread about tuning with the Kenwood TL-922 TL-922A Power amplifier

Second part of the Dovetron Mod for Kenwood TL922A

Reviews of the Kenwood TL-922A Power amplifier

This amplifier had the full treatment, including nichrome hairpins, but they had to be removed because of parasitics or instability.