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sold, please delete

Thank you for the reply. I'm running mark v head. Current I have the oversize 4x12 and the vertical 2x12. I want to trade my 4x12 for a 1x12

No I'm actually on Mark IV mode.

Thank you folks. I have them all on 90 watts and I always have it on pentode. This must be normal then from what you described. I appreciate your helps

I can also trade this with your 1x12 mesa cab.

I'm wondering if you guys have compared the 2 http://www.mesaboogie.com/Product_Info/Guitar%20Cabinets/RECTOcabs/Recto1x12-LG.htm http://www.mesaboogie.com/Product_Info/Guitar%20Cabinets/RECTOcabs/Mini-RECTO-Cabs-Main2012.html What's the difference in sound? Thank you!

Just curious where your channel 3 level sits. I have to set volumes on chan 3 to 9 o'clock while chan 1 and chan 2 are on 12 o'clock to make the volumes even. If this b/c of the recent retubing in the v1 position?

Since you have no problems with chan 1 & 2, you should check your preamp tubes v4, v5, v6. Do you have a spare 12ax7? If so, swap v4, v5, v6 out one at a time. It definitely sounds like a preamp tube issue. (You should have a tube location chart on the inside of your headshell)

Called mesa and they told me this is completely normal.

Crane, I think it's from the transformer but when I put my hand on it, i couldn 't feel the vibration at all. But you do hear a clear audible vibration added the moment I take off standby. Are there any other components in the chassis that could be vibrating?

I think I located the source. Put your amp on standby. Put your ear on the amp head shell, close to the power transformer (turn your fan off). Now put your amp off standby, all of a sudden you hear the transformer adding a hum, which is the exact tone as you hear from the cab...

I'm not sure about this but does this have anything to do with the DC heater for the tubes?

Mine is as loud as the fan, with all volumes down, on Chan 1. If you are 6 feet away from the cab, you won't hear as much. My mark iv on the other hand is dead quiet. I have changed V1, yielding no different result.

Oversized 4x12 cab with V30s for sale. 480 plus shipping. I can send you more photos if you PM me.

This bugs me a little too but as you mentioned, the signal to noise ratio is so great that this doesn't even show up on a recording. So I can deal with that. On a side note, my mark IV is completely quiet with the volume all the way down for some reason.

Check v1 and v3. 5u4g is the rectifier tube.

Please delete this post. I don't need it anymore.

Mine has a quiet hum if you put your ears close to the cab, and when you completed turned down the master volume. My tech said it's from a power supply coupling with the preamp tube.

By going through this forum page by page I guess I answered my own question http://forum.grailtone.com/viewtopic.php?f=33&t=65155

Definitely buy directly from mesa. They will send you stock parts