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So this is my 6Y6 amplifier, this is running in pentode operation. This tube is a real gem in this mode of operation, and has a few things about it that make is a true outlier. 1) It's plate impedance make it so you can use a 2.5K Hz primary on the output transformer. This is unique because this creates a lower winding ratio, which means you can put more windings on the same size core compared to other tubes that need a higher plate impedance that cause a higher winding ratio. 2) In pentode mode it makes about 4.5 watts of output power, this coupled with the low plate impedance and speaker above the range of 95dbs w/m make for a much solid base than is usually obtained by a single ended amplifier. 3) The 6Y6 doesn't need a great deal of voltage to drive it, less than 8 volts peak to peak, so you can operate a low Mu high Gm tube which gives a more laid back easy presentation to the music. Where higher Mu tubes usually have a more "glassy", or "edgy" type of sound. 4) A single ended amplifier based on the 6Y6, which has a maximum plate voltage of 200vdc can operate quite well at voltages even as low as 140vdc, which means you can make a power supply from a isolation transformer, but to get the decent wattage you need to have current in the range of 70ma per power tube, so the output transformers, and power supply need to be made to accommodate this, and higher Gm driver tubes feeding the 6Y6 will normally run higher that usual plate current as well. Therefore designing a power supply that can feed as much as 200ma is a good idea. The amplifier shown above is using a switch mode amplifier, that is very quiet. 5) Probably the most difficult thing about the 6Y6 is it requires more current on heaters, which made it unpopular with manufactures, that usually selected the 6V6, or 6F6 instead. Best of all though is this tube sounds wonderful, much more balanced than most single ended power tubes in the same wattage range.