![]() The difference is that the cap in the Real/Blue is ~2.3 times bigger, so it will roll off more highs. A higher output Z will typically make an op amp more stable, but at the consequence of making it clip itself.Īlso at that gain stage, there's a low pass filter to soften the treble response of the op amp, and it uses a gain pot in a similar way as you'd find in a Tube Screamer. The latter is more common in op amp-based drive pedals. The Real/Blue types have what is a pretty high loading on the op amp of 100K, while the Tube Driver only had 10K. ![]() To try and keep the tech-speak to a minimum, one difference that I quickly see is both the loading and high pass filter from the actual gain stage in the two (which is a TL072 op amp stage) is different. There are some differences, but AFA being superior to another is probably going to be a subjective call. I just re-reviewed the schems of the Tube Driver vs.
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