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
Visit SB-220 / 200 Amplifier with Solid-State Transceivers DXZone Resource Page
Download sb-200-mod.pdf file from www.tech-systems-labs.com