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PostPosted: Wed Jun 14, 2017 2:06 pm 
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Mark II

Joined: Wed Aug 04, 2010 10:32 am
Posts: 66
Location: New Jersey, USA
I have been reading up a lot more about preamp tubes, and came upon issues regarding modern-design tubes out of the Reflektor plant having issues with the filaments when used in a cathode follower position. Something about the voltage differential between the heater filament and cathode in those positions causes issues.

I did find one list, but it's from 2012 and doesn't have a list of amps that do not have any of these positions.

Lone Star & LS Special: V3
M-Pulse: V2
Stiletto: V3 & V4
Venture: V2
Road King I: V3 & V4
Big Block 750: V4
Road King II: V3 & V5
Titan: V4
Roadster: V3 & V5
M2000: V2
Dual & Triple (2ch or 3ch): V3 & V4
Bass 400+: V2
Tremoverb: V3 & V4

Does anyone know if the Maverick and DC series amps have any cathode follower circuits?

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Guitars: Hamers, Heritages, G&L Legacies, EBMM Steve Morse, Carvin Bolt, Fender Tele
Amps: DC-5 1x12 w/Master Volume + EFX Mods, Maverick 2x12


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PostPosted: Thu Jun 15, 2017 2:36 am 
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Donating Member

Joined: Sun Apr 14, 2013 5:45 pm
Posts: 229
I bought a C+ off eBay and when it arrived I realized it had 6 preamp tubes, the typical 5 and then had one extra one behind V1 by the output Transformer. I was getting some work done on a C+ at the time and when Mike B. called me I mentioned to him this C+ with strange 6th tube. 2/84 was on the chassis HR 6 and a 15 was marked with sharpie on the end. It had the 105 Transformer but one of the lowest serial numbers for a factory Id ever seen. Mike B informed me there was a gentleman, owned a chain of music stores in California and he sold those and couldn't handle retirement so he got a part-time job at Boogie. When the C+ circuitry was developed and perfected to their liking this gentleman wanted one but he wanted it to have more Headroom. Mike B. Remembers this amp and the story behind it. He put a cathode follower in it and it left Mesa a factory Mark II C plus with a cathode follower tube. Got a little excited when he was describing it to me because I believe that's the only one he ever did that too. It's without a doubt one of my best C+'s, definitely has the best clean of all of them and rates right up at the top with the gain channel. I didn't know anything about Russian tubes in a cathode follower circuit but found out immediately.I put a Russian in there and it lasted all of about 4 minutes. I've since put an old Chinese tube in that spot and haven't had a problem since. I know very little about cathode followers but this is definitely a special amp.


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PostPosted: Thu Jun 15, 2017 11:56 am 
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Mark II

Joined: Wed Aug 04, 2010 10:32 am
Posts: 66
Location: New Jersey, USA
awesome! I had read that pretty much none of the Mark series amps have cathode followers, so that makes it a rare beast indeed!

_________________
Guitars: Hamers, Heritages, G&L Legacies, EBMM Steve Morse, Carvin Bolt, Fender Tele
Amps: DC-5 1x12 w/Master Volume + EFX Mods, Maverick 2x12


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PostPosted: Fri Jun 16, 2017 2:42 am 
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Donating Member

Joined: Sun Apr 14, 2013 5:45 pm
Posts: 229
Mike customized it for a friend/employee. After the conversation with him, I wished I would have asked him if he had ever done that before for anyone. I'm sending a different one to California to get it recapped and looked over, I'll remember to ask Mike had that ever been done before or since when he calls me to discuss this other amp. I posted gut shots a couple years back before I talked to Mike to get some feedback. No one has heard of that before but I did get some comments on how clean it looked. I'll definitely never get rid of it. The only reason I mentioned it was to add an oddball to the ops list of cathode follower amps.


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