Heathkit SB-220

2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM

SB-220 SB-221 Heathkit Amplifiers - SB-220 or SB-221 Heathkit Amp Using Eimac's 3-500Z - K0GKD

2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM

Adding 160 meters to the Heathkit SB-220 - There will be radical changes to this Heathlit SB-220. There will be the addition of 160 meters along with many other circuit and design changes.

Heathkit SB-220 - The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975. Resources and modifications

Heathkit SB-220 and SB-221 essential mod - Modifications to avoid damage when 3-500Z tubes fail.

Heathkit SB-220 Meter Repair - Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

Improving Heathkit SB-220 - Circuit Improvements for the Heath SB-220 Amplifier

Modifying the SB-200 - Repairing a Heathkit SB200 and adding some modifications

QSK for the TL-922 and SB-220 mods - 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.

SB 220 modification - IV3GFN modification and restore of an HeathkitSB220

SB-220 / 200 Amplifier with Solid-State Transceivers - Using Solid-State Transceivers With Older Tube Amplifiers, some Hines and Kinks on the Heath SB-220/200 that can be useful in your application

SB-220 Mods - Heathkit SB-220 Amplifier modification by KE5YA

SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

SB-220 SB-221 Heathkit Amplifiers - SB-220 or SB-221 Heathkit Amp Using Eimac's 3-500Z - K0GKD

SB220 refurbish - Heathkit SB220 refurbishing by PA5CA