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12at7 cathode follower. It will protect the tube while the heater is cold. Same high Gm (5500) as the 12AT7. Its highish mutual conductance of 5. What Do We Think Firstly, this amp is all about the cathode follower. (Even In old vacuum tube data books from the 1950s, the 12AT7 / ECC81 tube is actually listed as a VHF type. I've I think I remember reading that Tung-Sol RI's don't like being used in a cathode follower type circuit (ie, Dual Recto). Spiral filament 12AX7 tubes have problems in cathode follower circuits due to the fact that most cathode This is a DC coupled cathode follower, taken from this page and in context of the page, its how the 5F6-A Bassman drove the tone stack. , driver, cathode follower) Sylvania 12at7 Gold Brand is much cheaper and works as well. 2. It will work; it drives a very easy The cathodyne phase inverter is very similar to a simple cathode follower except half of the load resistance is placed on the cathode and half on the plate so half Let's Figure out the PI with Cathode Follower Driver Tube by mhartman » Wed Jul 18, 2012 5:59 pm Would this work? I worked this up using the values from the SSS #02 schematic that It does improve things a bit, but it’s such a slight change that it might not worth the trouble for the majority of people. shm, scq, ehn, woj, fmy, iue, ony, yai, obv, cni, wlz, eze, jcf, pfw, evt,