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Though it is not an e.q., along similar lines: use a BBE Sonic Maximizer, and emphasize the bass process. The sonic stomp can do this, in a pedal format. Don't overdo it - if you find you have that tendency, consider using a different cabinet instead.The things to do is stick an EQ in the loop and get some low end, much more than any tube change.
I have to disagree - there can be profound change in bass. Have you ever tried this? I have, literally hundreds of times. But tube changes do have a smaller degree of influence than do speaker and/or cabinet changes.Changing tubes is unlikely to affect the bass at all
Nope, on the floor about 6 inches from the wall. I have the option to close the back of the cab, but currently with the partially open option seems to allow the low end bloom a little bit more.Just a thought: you don't have the cabinet on a stand, now, do you? That'll reduce lows quite a bit, depending on your floor type/size.
Although an output transformer will pass a low signal, the efficiency drops a lot and the waveform becomes very distorted. Lots of inductance and a large lamination stack help here, but that doesn't describe most EL84 equipped amp's I've worked on. The limiting factor is the output transformer and the amount of current the tubes can serve up. The only quick and easy way to improve the latter is to wire the output section in triode. This will of course reduce output power but it will indeed serve up relatively more solid bass.Changing tubes is unlikely to affect the bass at all, as pretty much every tube amplifies all the way down to 0 Hz (DC) with no loss of gain. Bass response is entirely affected by coupling caps, the output transformer, the speaker and its enclosure. I suppose a tube that's weak in high frequencies might make it sound like the bass is being emphasized but I suspect that's not the sound you are looking for.