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HI EVRYONE AND MERY CHRISMAS 2022.... Good morning all I am looking for photos or a plan to adjust the bias of my 6l6 tubes. it is enough I think to replace a fixed resistance by an adjustable one...? which ? what value? what power ? Thanks for your help on this item. Dom

Hello Thank you very much for your answer I think I found the cause of the error... the black wire on the loop return plug was unsoldered. probably because of a collar that I had placed too close which forced it. Since then everything has been working fine. You see the solution you mentioned...

hello recently I have a major power loss on my amp. I checked the voltages of the power supply board and they are all good. I have to turn volume 1 all the way up to hear a slight overdriven sound. I cleaned all the jacks and changed all the tubes (preamp and amp) I even changed guitar and input...

Hi everyone i just want to know who is what ? i have 5 connections in the middle of the Mark IIb chassis. i suppose: A) one RCA for reverb FS with a red wire https://imgur.com/gallery/UzlOteT B) one Jack double with yellow wire...

hello thx for your answer... i undestand but when a look at the schematic i think the stereo footswitch are not for the reverb .... the connection for reverb exist with RCA .... right ? i post the schematic in my comment.....i have 3 jacks ( one mono , one stereo ,and one rca) I think it is...

hello would like to use all the possibilities offered by my mark IIB (export version 60/100w equalizer and reverb). and as I do not have the wiring corresponding to each jack I would like your help ... I posted 2 photos corresponding to the chassis of the amp. I followed the wiring of each jack...

hello good question , i seach any information about cofigurations around mark 2 with mark 4 .... does any people have a schematics or draws about mark 2 to mak4 , mark4 to mark 2 .... thx for your help dom

hello I would like to use the preamp of my Mark2b with my mark 4b ... would you have an idea of the connections? I have 2 jacks on the chassis of the M2B ... which will be for the preamp out / pwr amp in? the other will be the gain boost? which jack for the EQ? On the Chassis? and for the out...

HELLO ANYONE HAVE A SCHEMATIC CONFORM WITH MARK 1 ? i think about mainboard , powerboard, alimentation; reverb and Ge (not sure) pcb or layout from mark1 are really good for me if you can trade .... thx for your help dom

Hello Can someone give me to me a schematic of MARK 1 ( preamp and power amp) i found some informations but no possibility to read correctly the values of resistors and capacities... perhaps it will existe a PCB with layout about Mark1 ?(it will be fantastic) nota: i don't know if the Mark1...

Hello here is the configuration of the tubes on my mark 4 b https://imgur.com/gallery/J89mjJu V1 is very important. I have a Mesa 12ax7 setup with STR 440s. I often play with the R2 for a creamy sound and on Lead to boost the sound. (similar sound with more boost) small reverb on and no GE...

Hello all MARK 2B i need some informations about female jack on Mark 2B chassis. look at this pict https://imgur.com/gallery/mKvcHXy I add 4 colors for theses jacks into this pict green: ? red: ? blue: reverb ? yellow: ? mARK 4B...

hello Could someone tell me where I can buy the 4 plastic plugs that equip the MarkIV amps ? These are the 4 black plastic parts that are above the 4 silent-blocks that hold the chassis. Thank you for your answers Dom

Hello Actually, it is no longer possible to find a card for a mesa boogie mark 1, 2, 3 or 4 amplifier, or juste to buy a used amp and take off the cards. eatch amp have his own card (rp09 , rp10,rp11....idem for power card and other...) the idea will be to créate a possibility to find the right...

hello can you repost yours pict about the footswitch for MarkIIB Pls ? i con't open it i have a same reflexion for all jacks....on the chassis... i have a MARKIIB EXPORT with Reverb, Eq, 60/100w tx for your answer. dom

Hello for the Mark 4B I use MESA 12ax7 preamp tubes and for the power of the RUBY 6L6 GC tubes my settings are as follows: LEAD: gain8, treble5, bass3, lead5, pullbrightmaster5, presence3 (pull on) RYTHM2: gain8, treble6, bass4, lead5, pullbrightmaster4, presence4 (pull on) SPEAKER: Altec 417...

the chassis files dom [https://imgur.com/a/qxBVBll]

hi For all people who will want to change the Chassis look at: https://www.tube-town.net/ you can find a germany shop who you can buy an aluminium chassis for Mesa Type Mark. TT CHASSIS 021 : Mesa Short Style Chassis, bare Without drills and cutouts Aluminium Chassis Mesa Width Style Size: 523...

hello and thank you for your feedback. I understand your opinion and I understand you when you see your work being sold by unscrupulous people ... for me a forum is used to exchange information and offer various solutions for troubleshooting. the fact that it is no longer possible to buy Mesa...

OK I can see that each person works solo for their achievements. repair or build your amp remains a secret thing here but then a question: why publish articles and photos to say afterwards: I simply realize them for myself. Lol it's a joke !! all kind of musical forum will help people to engage...