As of 11/8/09 the NS-50 is being upgraded to the NS-60. This amp will be fully compatible with 6L6's and EL34's on up to 6550's and KT88's. Maximum wattage with the larger tubes will be 60 watts per channel. All other features remain the same and the appearance will not be affected, except for larger transformers.
A new model is available: The NS-SEP30. Full details are on our web site.