Recent content by SquierJVs

Excellent. Thank you for that clear explanation. Off to my local music shop to pick up the Mesa 6v6's I ordered. :-)

Well the manuals are very clear ... TWEED and SIMUL-CLASS _only_ with 6V6's (and all 4 need to be 6V6's). But the selection of Pentode vs Triode is independent of Simul-Class and Tweed settings. My question is whether there is a restriction? Or is just the guitarist's choice?

Hello all, I've read the user's manual for both the Mark IVa & IVb. Both have the same info regarding the use of 6V6: - "four 6V6's can also be used in the MARK IV ... but, ONLY when TWEED and SIMUL-CLASS are selected" But nothing is said about the use of Pentode vs Triode modes. Does anyone...

Hello thecordova, If I understand your question correctly, you are trying to determine if the Bass control on the Lead channel of your amp is behaving "normally". I think it depends on the amount of Gain & Drive you have configured. I have the same amp and I ran a few experiments. With...

Hello, Call Mesa directly and ask for that part number. You may wish to purchase other front panel pots as well. My experience with a MkIVa was that when one goes, the other are not far behind. Also, you may save on freight/mail costs. (And on time ... once you have the chassis out and on...

Hello fantomaz, During the 90's, the Satellite 60 and Simul-Satellite were part of the Mesa Boogie product line. These amps were simpler companions to the Mark IV. Typically these were used as part of a stereo setup. (Mark IV effect-Send to stereo effect, 1 side of stereo effect to Mark IV...

Hi alphasports, This sort of problem can be difficult to debug sometimes. Before taking it to a tech who is experienced with Mesa's, check for things like: - remove anything in the effects loop and/or try inserting & removing a plug in the return a few times. - check if the buzz is changing...

Regarding the chassis screw, can you cut & paste the answer from the Mesa Boogie email? Now to the SPAX7 ... with this latest series of pictures, I definitely understand the problem better. The portion of the metal shield shown, is the base of the tube shield. In my Mark IVa, the base is...

Hello, The rubber coating on the SPAX7 is a standard feature of this tube. And it is the recommended tube for the V1 position of the Mark IV. So you should leave it intact. The metal tube shield is also a standard feature for the V1 position and should be installed (assuming that you wish to...

Hello, The "screw" is really a narrow diameter bolt with a slot head. As others have noted, the bolt is intended to add tension the large, flat, horizontal panel of the chassis and reduce its vibrations. The extra length seems to be intentional as well. If you over-tighten the bolt, it will...

As others have said, you don't have to remove the chassis to change tubes. A few tips: - the power tubes are easy to get at and change (I like my fingertips; so I let the tubes cool off). - preamp tubes are harder to get at. Easier if you remove a power tube or two. Sometimes, the RCA...

2) mystery jack I found the answer in the Mark IVa manual. I should have looked there before experimenting. The "Satellite" powered amp & speaker systems have a similar GEQ jack. By connecting the two via a cable, the GEQ on the Satellite is enabled whenever the GEQ on the Mark IVa is enabled...

Congrats on the MkIVa. 1) Reverb Try reversing the reverb cables. On my amp, the thicker cable (grey on mine) is plugged in the RCA closer to the amp front and the thinner (white) is plugged into the RCA closer to the back. Also check the cables for continuity. BTW the tubes seem reversed...

Lots of things can cause the symptoms that you describe. Take it to a good tech to find which one is causing the problem. With my Mark IV, the push-pull pots had worn out (although they did not make scratchy noises when they were used). Once the first one was found, I had all of them double...