"TL" or low mu tubes are much easier to drive than "TH" or high mu tubes. Driving a TH tube takes a power amplifier circuit. This is where MOSFETs shine. The advantage of TH tubes like the 100TH below is that by the ver design, they have to be run in A2. This makes them capable of producing a lot of power. And because they are very difficult to work with, they are usually a lot cheaper.
Where do you go from there? The 304TL of course. Here we were able to find some 304TL tubes at a moderate price which allowed for good old fashioned A1 driven through a interstage transformer.
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