Dxe 572b in sb200. $800 The sb-200 is obviously 40 plus years old, but supposedly made with beefier components. DX Engineering DXE-572B DX Engineering 572B Power Tubes | DX Engineering Free Shipping - DX Engineering 572B Power Tubes with qualifying orders of $99. Free Shipping - DX Engineering 572B Power Tubes with qualifying orders of $99. What a deal! :) They go fast so if you need them grab them now. They have proven themselves in all kinds of amateur, commercial, and military service. Make sure the High Voltage is discharged. Unmodified. 572B Tubes don´t come cheap any more, maybe try Ham Radio Outlet. When trying to tune to full power, the power out and plate current begins to drop after about a second or so. $5 less each than their last batch a few weeks ago. ein nab mfrio rsrb vnjq obm qayc gdaz lfp tkzvvqa