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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

A QST article, hints and kinks on improving the SB-200 amplifier

VFO Stabilizer for Kenwood 120, 520, 820, 530, 830 Yaesu FT-101, 901,2 TenTec 580, 540, Triton, Corsair, Omni series, Swan 350, 500cx, Collins KWM 2 and 2A, Drake TR4, T4, R4, Heathkit HW101, SB 104a....and many others

Robert Norgards KL7FM's, notes on upgrading the Heathkit SB-200

Collection of modifications for the Heathkit SB-200 RF power amplifier

IV3GFN modification and restore of an HeathkitSB220

Heathkit Icom Kenwood Power Transistors Ten Tec Yaesu spare Hamradio parts.

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

Heathkit SB-220 Amplifier modification by KE5YA

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

Eham user's review on the Heathkit SB-200 HF amp

A complete restoration of a Heathkit SB-200 HF power amplifier

Heathkit SB220 refurbishing by PA5CA

A well documented Heathkit SB-200 restoration project by NT1K

A document describing the reparing and restoration of an old Heathkit SB-101 power amplifier