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Heathkit SB-220 Amplifier Upgrades Manual

This manual includes a set of advices, upgrades, mods, and "how-to" on most of the kits designed for the Heathkit SB-220 linear amplifier. 148 pages and compendium 39 pages in PDF format 21 x 29.7 cm, by download.

Included in this Manual

- How to make and replace the parasitic suppressors

- How to modify 10 meters input circuits to decrease SWR

- How to mod or add the 6 and 160 meters bands

- How to reactivate easily a NOS 3-500Z tube

- How to add a universal ALC

- Glitch protection

- A3 format Schematic diagram

-3-500Z datasheet

Upgrade Kits

- Parasitic suppressors

- How to add a soft-start circuit

- How to install a Soft-key

- How to add a Rectifier & Metering circuit

- How to add a filtering circuit

- How to add a new 5.2V/15W BIAS zener diode

- How to connect an adjustable Bias

- T/R replacement relay wiring

- Where to buy parts

These modifications and much other are included in this notice

In addition

SB-220 Compendium

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