I have the recipie for the Atlas bass heads, quite simple and turns it into a rich and creamy screamer. I had three and still own two, a friend has the other. One of the best plug and play amps, 3 knobs, touch sensitive and behave like a tube rectified amp. I used mine for a recent gig opening for Corey Stevens, it sounded great. Both of mine are 1964 heads.
They are on the right side, with the matching cab in the middle.
Are you getting one??? Happy to get you the details....