| TS7 Blindfold Tests /\ | ||
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The prevailing wisdom is that the JRC4558 op-amp sounds better than the TA75558 used in some later "TS9" versions of the Tube Screamer. I made one set of recordings using the JRC4558 op-amp that came with the TS7. Then I made another set using a TA75558 op-amp. The recordings were made using Test Rig 1. The TS7 had neither the output resistor mod nor the carbon composition resistor mod performed.
In each section below, one of the recordings was done with the JRC4558 op-amp and the other was done with the TA75558. They have been mixed randomly. Select the recording you think has the JRC4558.
| Section 1: Blues Riff | Recording A (2867K wav) | Recording B (2823 wav) |
| Section 2: Long Power Chord | Recording A (1853K wav) | Recording B (1840K wav) |
| Section 3: Short Power Chord | Recording A (248K wav) | Recording B (256K wav) |
| Section 4: Lead with Dynamics | Recording A (2894K wav) | Recording B (2887K wav) |
| Section 5: Long Single Note | Recording A (1009K wav) | Recording B (1066K wav) |
| Section 6: Short Single Note | Recording A (174K wav) | Recording B (190K wav) |
| Section 7: Long Fourth | Recording A (1299K wav) | Recording B (1287K wav) |
| Section 8: Short Fourth | Recording A (158K wav) | Recording B (153K wav) |
The average score so far is 3.5 out of 8 correct. I certainly can't hear any difference in the recordings, so I'm inclined to think that these op-amp changes are having no effect. But someone could prove me wrong!
