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Title: Drive requirements Post by: Barrie on April 09, 2009, 09:08:54 PM Looking at the data sheets for the 35TG and the 25T, I'm puzzled about the driving requirements.
A pair of 25Ts require 4.4 watts drive, at 1500 plate volts, for 150 watts out. (A single 25T requires 2.2 watts drive. I'm assuming that a push-pull pair would require 4.4 watts) A single 35T/35TG requires 9 watts drive, at 1500 plate volts, for 141 watts out. Since I'm hoping to drive this rig with a Meissner Signal shifter, I don't think that I can drive one 35TG with that. I think I could drive a pair of 25Ts with the MSS. What am I missing here? 73, Barrie, W7ALW Title: Re: Drive requirements Post by: WA1HZK on April 12, 2009, 06:20:12 PM Those spec's may be figuring for 100% efficiency. There will be losses getting that power into the grids. Always have some extra drive power available to waste as heat in the grid. ckt.
Keith Title: Re: Drive requirements Post by: KM1H on April 14, 2009, 09:07:11 AM A pair of 3C24's require about half of the Signal Drifters 15W leaving plenty of overhead for coupling loss. Those are real common tubes at giveaway prices. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Carl KM1H |