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I have to agree that the Gibson pickups are a bit hyperactive. (Mine are PAT NO 2737842, Supposedly an older equivalent to the current '57 Classics, according to the folks at Gibson.) I was going to go with DiMarzios (based upon Morse's sounds, but have since planned on some zebra (or gold...

After reading my post, I should add that the NEW tubes did not change the behavior before/after. Kirk[/b]

I have a new-to-me 1995 Mk IV which I've just re-tubed (w/Mesa tubes). I am puzzled by the sound of the LD vs. LD+EQ. With the EQ, the sound has SOOO much more depth -- almost like a delay/chorus of sorts. Don't get me wrong, I actually LIKE sound, but my question is "Is this the standard...

The cable connecting the FS-5L switch was simply a 3 foot long speaker cable that I would normally patch to the Thiele 1x12 ported cabinet. Given your concern about switching the reverb off/on, do you you believe that the cable and footswitch are part of the reverb signal circuit? It sounds as...

I've discovered, via my newly acquired FS-5L footswitch, that the reverb circuit on my new-to-me 1995 Mark IV has noise. The noise is directly proportional to the amount of reverb dialed in (on the control next to the footswitch jack). Could this be as simple as a bad tube, or are there other...

With the serial# in hand, I called Michael Wolfe with a couple questions. As it turns out, given the serial#, he correctly identified the amp and placed its build date in February 1995. I also asked about a "Ground" feature on the reverse panel. I'm told that is to prevent ground loops from...

Looking upward under the lip near the power cord, I found the serial# (IV-0073xx). I didn't see any dates, but I'll keep looking. Thanks for your help!

[I posted some of this to the announcements board, but decided that this board is the target audience.] Wow! What an amp! My used Compact Combo Mark IV just arrived, and I am delighted. It joins a recent 1x12 Thiele C90 cabinet that arrived last week. I have a bunch of questions: 1) where...