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I just bought another c+. I asked the shop I bought it from if they could send pics of the transformers before they packed it for shipping. They didn't know if it was a Simul or 100 watt. They pulled the chassis and found a sticker on the side of the chassis with Neal Schon written on it. I sent...

My favorite tube combination is probably NOS Chinese Military Beijing 12ax7's and Sovtek 5881's. The Chinese 12ax7's have a sweet, dynamic overdrive and the Sovtek 5881's sound thick. The 5881's are also very durable and can handle the voltage when used in a c+\III+ with the 105 transformer.

Congrats!

What preamp tubes are you going to use? The Mark III's originally came with Tungsrams and then Chinese Military Beijing 12ax7's. I really like the Chinese tubes. They're brighter and have more gain than the Tungsrams.

The c+ is the King of the Hill with the Coliseum at the very top. I was recently talking to Mike B. about my Coliseum and told him that it was the Head of Class. He said that's because everyone else had left the classroom.

A Mark III+ with the 105 transformer will get you close to a c+. The III+ maybe sounds a little compressed compared to a c+ but then all c+'s don't sound the same. My Coliseum sounds huge. I actually spend most of my time with my III+'s because of R2. I got my III+ DRG Wide Chassis with the 105...

The difference is the power transformers and also if a Simul Class has the brightness reduced. A factory HR has punchier cleans and tighter overdrive. An early factory DR with the brightness reduced has sweeter cleans/leads and softer attack. My upgraded HR is somewhere in between and is one of...

I’ve been trying various tube combinations in my III+ DRG with the 105. Last weekend I put in Mesa Russian 2 12ax7’s, 440’s and 447’s and I’m really happy with the way it sounds. I save the 415’s for my 100 watt c+’s. I highly recommend sending your amp to Mesa for the III+/R2 mod.

Nice! I've got a dozen c+'s and my Coli is the king of the hill.

The jack near V2 is for the eq footswitch. The other jack is the pre amp out - power amp in jack. From the Mark llc manual: A Pre Amp Out-Pwr Amp In jack is located on the bottom of the chassis and provides access to the junction of the preamp and the output power amp. With it, another Boogie...

I was kidding!

I’ll have to confirm this with Mike B. but I think it’s Mark lld.

Maybe somebody wanted to upgrade their c+ to Mark lll.

I asked Mike B. if there was an export c+ Coliseum. He said all the Ks have a dual primary transformer, wired in parallel they are 117 volt and in series they are 235 volts and that they have to be wired internally for the selected voltage.

Nice! I have the same attitude towards c+’s.

Looks and sound really nice.

Sounds real good!

Mike B. can’t retire until he mods my Studio Preamp and Mark lll HRG!

They’re out there. I found a factory DRG combo with a road case and footswitches last month for $2230 including shipping. I paid $1500 for the Mark llc Coliseum. It came with 6 STR-415’s. It’s on the way back from Mesa. I had Mike B. do the c+ upgrade and replace the caps. He also had to remove...

Congrats on the new amp! If Mike B. changed the caps when it was serviced it should be good for a long time. My favorite preamp tubes are Chinese Military Beijing 12ax7’s. In my 100 watt c+’s I use STR-415’s. In my Simul’s I use a quad of Mesa STR-425’s or STR-447’s in the outer sockets and...