I can confirm that with 3.5kV on load, the GS35B will produce 1.5kW out on 6m, 2m and 70cms. I have made around a dozen amplifiers with this tube. It is not as gainy as a 8877 but yes it is a good tube for the money. Not that good though :-) I don't want the USA market to buy up all these tubes as it will surely force the price up:-) 73 Conrad G0RUZ