000 002690000a22001210004500
080 _a621.375
_bV3
100 _aValley, G.E., ed.
245 _aVacuum tube amplifiers
260 _aNew York
_bMcGraw Hill
_c1948
300 _a743p.
700 _aWallman, H.
942 _cBK
999 _c52695
_d52695