Bri, 5534's were either the most ubiquitous gain block to enter pro audio, or the spawn of hell, depending on who you talk to.
I think that they helped the true mass-production of consoles, but at the cost of a lot more TIM and more junctions of silicon to plow thru with your waveform. And consoles started to sound similar.
but more importantly, as in earlier posts here, I 've never seen 2 Industry Titans discussing what the emitter inductor truly does in a 5534.
'Cause there is just no place to connect them.
Remember MCI's "Swinging Opamp"? Strap-on solid rocket boosters.
Hey, you can all blame these guys:
<img src="http://www.globalnetvillage.com/images/crystal_triode2.jpg">