Herron VTSP-3, if you are after neutrality. This latest version has low/high gain mode, a remote & uses 6922s.
[url]http://www.positive-feedback.com/Issue35/herron_vtsp3.htm[/url]
[url]http://www.positive-feedback.com/Issue35/herron_vtsp3.htm[/url]
seeking preamp suggestions for Lamm M1.2 amps