Linear Tube Audio ZOTL Ultralinear Power Amplifier

Say hello to the latest member of the ZOTL amplifier family. The ZOTL designation describes amplifiers that use David Berning’s patented tube output stage that doesn’t require an audio output transformer. The new 20Wpc ZOTL Ultralinear (UL) amplifier reviewed here expands Linear Tube Audio’s (LTA) portfolio of David Berning designs yet again. Kudos are due to LTA’s Mark Schneider for that. It also marks David Berning’s resumption of his “love affair” with TV sweep tubes that was interrupted by the EL34-based ZOTL 40 that I reviewed in Issue 273. Berning’s embrace of Compactron TV beam pentodes goes way back to …