FS 2 Pairs 4-400A Tubes. I have two pairs of 4-400A tubes. One pair is a set of RCAs and the other pair is a set of Amperex 4-400As. Both sets are pulls but are good. Price is $85 for each pair or $160 for both sets(total of 4 tubes). Shipping in CONUS is free. Thanks, Charlie Hugg, K5MBX