I didn't mean to follow the topology of the 5E3. My original intent was to revisit my failed attempt at a single tube triode-pentode input stage (http://www.tdpri.com/threads/single-ended-6bq5.869737/). I had used a 6X8, which had a common cathode between the triode and the pentode, which made biasing a real pain, and there was quite a bit of mismatch between the gain of the two sections. I scoured Frank's electron tube database and found the 6CM8 tube. It has separate cathodes. The triode section is pretty close to a 12AX7, with a gain of 100, transconductance of 2000 umhos, and plate resistance of 50K Ohms (12AX7 was 1600 umhos and 62.5K Ohms). The pentode section has a transconductance of 6200 umhos, which was not too high and usable in a pentode configuration. The 6EU7 is in there because I don't like wiring up the parallel heaters of a 12A_7 tube. As for the output section, I've been thinking about a push-pull 6G6G amp for a while. I can crank this sucker, and not get yelled at by the better half. So after I drew up the initial schematic, I looked at it and thought, "Wait, I've seen this before." Hence the name. I'd been experimenting with LFO circuits and thought it would be fun to incorporate tremolo into the amplifier. The 6AM4 tube also harked back to the aforementioned failed build. I borrowed the basic design from the Gibson GA-40 amp, but tweaked the values a bit. I ripped off the implementation of the circuit from the Silvertone 1482, and tested the circuit with my 6AK6 push-pull amp, and it worked great. The output of the LFO circuit was 38V, so the 1.6M resistor and the 500K pot will bring the max voltage down to 9V for the 6G6G. Layout: I'll probably use a 220K mixing resistor coming off the triode section, and I'll adjust the resistor for the pentode section so that the voltage for the two sections coming into the first 6EU7 triode will be pretty close. The amp will fit into a 10" x 6" chassis. The shipment from Mouser will get here on Monday.