This could probably also be done using 4 x 4CX250 or similar tubes in parallel. The ex-DDR KN-1E amplifier using 1 4CX250 as driver and 4x 2CX250 in the final would do it but is very big and noisy... Peter --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html ---