Members Doittoday Posted April 13, 2009 Members Share Posted April 13, 2009 So if there's a half power/full power switch, is half power just el34's? and full power is el34's and half 6l6's? and that should affect the tone, not just the volume levels? is that right? I can't find an answer in the operation manual Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted April 13, 2009 Members Share Posted April 13, 2009 There are 3 different types of Mark III power sections: SimulClass, 60/100 and 60 watt (and Coliseum, but that's a different beast alltogether). With Simulclass, you switch between 15 (or 25 if green stripe) and 75 (85) watts. In Simulclass, the outer tubes are active, which can be either 34s or 6L6s and run in Class A. In 60/100, you can switch between 60 and 100 watts (obviously), but IIRC, these power sections are designed to ONLY run 6L6 tubes. In a 60/100 or 60 watt-only setup, all tubes run in class A/B. When you use the Simul or 60 watt switch, there isn't much of a volume difference. It's apparent, but it won't turn your 100 (or 75) watt monster into a good apartment amp. 15 watts is still pretty damn loud, 60 watts is REALLY f-ing loud. The primary difference is tone and feel. 15 watts compresses a LOT more at gig volumes and is much looser. 60 watts compresses a bit more than 100 at gig volumes. Neither will compress at all in an apartment. Link to comment Share on other sites More sharing options...
Members King Loudness Posted April 13, 2009 Members Share Posted April 13, 2009 How does one know if they've got a Simul Class or 60/100 power section? Link to comment Share on other sites More sharing options...
Members Doittoday Posted April 13, 2009 Author Members Share Posted April 13, 2009 How does one know if they've got a Simul Class or 60/100 power section? it says on the back of the head if its simul class Link to comment Share on other sites More sharing options...
Members King Loudness Posted April 13, 2009 Members Share Posted April 13, 2009 it says on the back of the head if its simul classOh cool, so I've got a Simul Class then, sweet. Link to comment Share on other sites More sharing options...
Members Doittoday Posted April 13, 2009 Author Members Share Posted April 13, 2009 Oh cool, so I've got a Simul Class then, sweet. On MIII's with simulclass: whether its half or full power switched,all the tubes are always active anyways? EL34/6L6's? or the outer 6L6's only go active when full power is on? and what's the point of this again? I'm still pretty confused Link to comment Share on other sites More sharing options...
Members gtrgeek335 Posted April 13, 2009 Members Share Posted April 13, 2009 Half power,outer tubes ,class a. Full power, all 4 power tubes, class a/b. Link to comment Share on other sites More sharing options...
Members Slaymoar Posted April 13, 2009 Members Share Posted April 13, 2009 On MIII's with simulclass:whether its half or full power switched,all the tubes are always active anyways? EL34/6L6's?or the outer 6L6's only go active when full power is on?and what's the point of this again? I'm still pretty confused On the 60/100 model, 60 watts = two inner tubes are on. 100watts = all tubes are on. If you have EL34's on the outside and 6L6 in the inside, then 60watts will be only 6L6, and 100watts will be 6L6 + EL34. -D Link to comment Share on other sites More sharing options...
Members vic Posted April 13, 2009 Members Share Posted April 13, 2009 if it says 60/100 then it is not a simulclass even if it has a sticker.if it has a class a/simulclass then it is Link to comment Share on other sites More sharing options...
Members Doittoday Posted April 13, 2009 Author Members Share Posted April 13, 2009 it goes "half power" and "full power" ;p Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted April 13, 2009 Members Share Posted April 13, 2009 If it says half power, then it's 60/100. Link to comment Share on other sites More sharing options...
Members gtrgeek335 Posted April 13, 2009 Members Share Posted April 13, 2009 On the long heads the switch will be half power/full power, could be simul-class,have to check for the sticker in back and/or the output transformer. Link to comment Share on other sites More sharing options...
Members rydogg_sc2 Posted April 13, 2009 Members Share Posted April 13, 2009 If it says half power, then it's 60/100. Wrong My simulclass blue stripe has the half/full power switch. That is normal in the Mark III Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted April 13, 2009 Members Share Posted April 13, 2009 WrongMy simulclass blue stripe has the half/full power switch. That is normal in the Mark III Your amp is labeled incorrectly. Link to comment Share on other sites More sharing options...
Members Slaymoar Posted April 13, 2009 Members Share Posted April 13, 2009 WrongMy simulclass blue stripe has the half/full power switch. That is normal in the Mark III Simulclass does not allow for half/full unless there is also an additional circuit which biases the outer power tubes back to A/B ... never seen that. -D Link to comment Share on other sites More sharing options...
Members Doittoday Posted April 13, 2009 Author Members Share Posted April 13, 2009 my amp is a blue stripe...says simulclass tagged in the back..and has half/full power maybe not a coincidence? Link to comment Share on other sites More sharing options...
Members Slaymoar Posted April 13, 2009 Members Share Posted April 13, 2009 my amp is a blue stripe...says simulclass tagged in the back..and has half/full powermaybe not a coincidence? Hmm.. In this situation the class A circuit would shut off and you would be left with the 2 6L6's that are capable of 60Watts.... Makes sense to have the class A circuit only produce 40Watts. I'm thinking that you only have the 60/100 option for the simulclass then. This would need to remove the ground which would be shared by the two class A tubes. -D Link to comment Share on other sites More sharing options...
Members guitarbilly74 Posted April 13, 2009 Members Share Posted April 13, 2009 Your amp is labeled incorrectly. Both these posts are correct. The explanation for the Simul-Class is correct and yes, there were quite a few amps that were incorrectly labeled. To be sure, get the schematics, open the amp and compare it to what you have, if you can't read schematics drop the chassis and give Mesa a call they might be able to give you some pointers to identify which version you have. Link to comment Share on other sites More sharing options...
Members rydogg_sc2 Posted April 14, 2009 Members Share Posted April 14, 2009 Your amp is labeled incorrectly. The long heads were labeled incorrectly. This dude's amp is a Simulclass unless someone swiped a sticker from another amp(doubtful) and I am betting it is a long head. Link to comment Share on other sites More sharing options...
Members phyrexia Posted April 14, 2009 Members Share Posted April 14, 2009 The best way to tell is to look at the Output Transformer or the power section of the amp. My amp has half/full on the front and no simul sticker on the back but has a 562003 transformer (which says SIMUL-CLASS on it). Link to comment Share on other sites More sharing options...
Members mustaine.dv8 Posted April 14, 2009 Members Share Posted April 14, 2009 my blue stripe is probably labeled wrong also Link to comment Share on other sites More sharing options...
Members King Loudness Posted April 14, 2009 Members Share Posted April 14, 2009 My green is labeled wrong too then. Link to comment Share on other sites More sharing options...
Members mincy Posted April 14, 2009 Members Share Posted April 14, 2009 The long heads were labeled incorrectly.This dude's amp is a Simulclass unless someone swiped a sticker from another amp(doubtful) and I am betting it is a long head. This sounds right. I have a long head, simulclass red stripe and it has a half/full power switch on the front. The short heads had a simulclass switch on the back but for some reason, every long head, simulclass I've seen has a half/full switch on the front despite being simulclass. Link to comment Share on other sites More sharing options...
Members therabbit Posted April 14, 2009 Members Share Posted April 14, 2009 Nothing like authoritative ignorance. Link to comment Share on other sites More sharing options...
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