Posted on April 25, 2020April 25, 2020 by zetaTube amp channel switch A new channel switching circuit board prepared for an old tube amp. Tube amp channel switching The plan is to fit it in this one. Siemens 6 S Ela 2427c /Krister Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)MoreClick to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)Like this:Like Loading...