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Product Reviews Average rating Last review MSRP 572B Tubes- China Manu. 21 3.9  10-Jan-2012  $$35 813 1 5.0  02-Mar-2010  $N/A AMPEREX 3-500ZG 3 3.3  29-Oct-2004  $200.00 usd Cetron Jan 811A 8 3.2  27-Dec-2010  $$25 CHINESE 572B TUBES 10 4.1  14-Sep-2011  $varies in price. Chinese 811A Tubes 3 3.0  12-Apr-2008  $15-30 EIMAC , 4CX250B 1 5.0  07-Feb-2009  $$$$ variable Eimac 3CX1200A7 1 5.0  05-Sep-2008  $$1235 EIMAC 3CX1500A7/8877 6 5.0  13-Oct-2010  $(missing—add MSRP) Eimac 3CX3000A7 4 5.0  16-Dec-2011  $prices varies EIMAC 3CX800A7 10 4.4  16-Aug-2011  $600 Eimac 4CX1500B 1 5.0  23-Jan-2011  $(missing—add MSRP) EIMAC 4CX350A 1 5.0  28-Nov-2007  $$$$$ ??? EIMAC 4PR1000B 1 5.0  20-Oct-2005  $(missing—add MSRP) Greenstone (USA), Inc., 4-400C Tubes 1 2.0  30-May-2011  $$160.00 each Heintz-Kaufman 811A Gammatron 1 5.0  07-Jan-2001  $None. Jetstream 811A tubes 1 1.0  11-Oct-2007  $(missing—add MSRP) Penta Labs 3CX800A7 1 0.0  22-Jan-2008  $$400 RCA 811 1 5.0  27-Jan-2012  $25$-55 ea as of 2012 RF Parts 3-500ZG 28 5.0  19-Jan-2012  $119.00 RF Parts 811's 7 4.1  19-Dec-2011  $79.95,59,95 Russian coaxial tetrode GS23B 1 5.0  12-Apr-2009  $200 Russian GI-7B 2 5.0  19-Jan-2012  $32.50 Russian Triodes GS31/GS35b 3 5.0  13-Aug-2010  $(missing—add MSRP) Shuguang 6146B 1 4.0  17-Dec-2007  $(missing—add MSRP) Svetlana 4CX800A ceramic tetrode 5 5.0  26-Aug-2010  $$100 Svetlana 572B 18 3.9  05-Oct-2011  $109.00 matched pair Svetlana 811A 1 4.0  12-Dec-2003  $24.95 Svetlana EL-509/6KG6 2 3.0  29-Jan-2004  $$13.50 Taylor 3-500ZG 1 5.0  24-Apr-2007  $(missing—add MSRP) Taylor 572B triode transmitting tube 19 4.3  23-Feb-2011  $99.90 matched pair TAYLOR 811 1 5.0  03-Feb-2012  $24.95 ea