Has any ever used 572B's inplace of the 811 tubes in the AL-811 amp ? And if so, how were the results ? 73 de Brian, KG8CO -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm