#ThomasMayer 300B amplifier with 866A Mercury vapor tubes... pic.twitter.com/WOisUPjs5B — Bernard Žvokelj (Berny2876) May 27, 2019 — Elesorca (@elesorca) May 27, 2019
#ThomasMayer 300B amplifier with 866A Mercury vapor tubes... pic.twitter.com/WOisUPjs5B — Bernard Žvokelj (Berny2876) May 27, 2019
