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A friend of my brother was going to throw out a Boogie 295 dual power amp. I was shocked to say the least. Apparently he didn’t want to sell it as he was told it would be unreliable in the future. I certainly hope this person wasn’t a technician. I have had a quick look at it and it appears...

I have a Boogie Celestion speaker is my modified SOB, it sounds okay, but it doesn’t sound like the Eminence speaker in my old Mark 1 amp, thus the amp doesn’t sound the same. I don’t know if the JBL speakers were that popular in the Mark 1 amps, but the Altec speakers as far as I know have a...

I have mentioned this before, but I can’t get over how different my SOB sounds to my original Mark 1 amp that I owned years ago. My Mark 1 amp was a sixty watt model with the stock Eminence speaker, and reverb. It wasn’t particularly bright sounding though it could get a lot of different...

I recently saw this presence mod for the SOB amp and decided to post it up so it doesn’t get lost. I haven’t tried this mod so I can’t comment on the effectiveness of the mod. Regards Mark

I have a Mesa Boogie SOB which I converted to a Mark 1. I’m think the rail voltages are effecting the tone of the amp. I don’t remember what the voltages were in my original Mark 1 amp. I knew they weren’t the same as the old circuit diagram. I will measure the voltages on the nodes of my...

not to be too critical, but I’m a bit surprised that people here aren’t across the various factory mods to Mark series amps. My poison is the Mark 1 amps as I own an SOB Boogie. There have been a few incarnations of the Mark 1. One amp was the Kingsnake amp. I think they replaced the 10K...

The link is to my efforts in rebuilding the SOB amp into something that sounds good and is similar to it's original form. I have pull pots to add the brightness switch that was in the Mark 1 and a mid switch. I will use the Dumble 2200pF value over the Mark 2 value of 750pF as I preferred the...

Hi There are various versions of the Mark 1, the earliest Mark 1 amp were quite bright whereas the later ones were quite mellow sounding. The S.O.B. amp was another version of the Mark 1 as was the Heartbreaker amp. The Mark 1 was also reissued some years ago too which differed from the...

Dear Boogie babies I noticed that you gave one of the guys some technical advice on replacing the fetron. I was wondering what technical advice you could offer me. Thanks for your assistance. Yours Sincerely Mark Abbott

I own a SOB amp which I converted to a Mark 1. That is to say I changed the phase invertor (which had the limit control) the the Mark 1 reissue PI. Which worked much better with this amp. I use to own an early Mark 1 amp many years ago, and I seem to recall the PI was different from the...