I wonder if it might fit the pattern of the Tube Screamer, without having to use another IC? It seems to me an excellent idea of the output buffer. However, this AC is 1.6 A RMS, and then tends to disturb the other signal tubes of the circuit, if it is not the screen. The 6550, as is normal in the power tube, has an amplification factor in tension rather low, so it is not very sensitive to the induced AC hum of the heater. I have done so for the heaters of 6550C in a single ended amp like the ace of "picche" of my avatar (equipped with a 300B tube). The shield seems to me a good idea does not do much weaving together the wires that carry the current to the heaters, you may instead use two shielded cables (coaxial). Since the 12AX7 has an amplification factor in tension decidedly higher than the AU (is more sensitive), if the hum is due to the AC (which is applied close to the pins of the grids) should hear more strongly when it is mounted the AX. To be sure that the hum is caused by the heaters, I'd suggest comparing the buzz with the 12AX7 and the 12AU7. Why not try it on your Blue Tube the 12AY7? David: Hi, You are very kind! In fact, I'd like to know what are the tensions on the 4558 at least as the TL072.
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