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Russ, Thanks for your detailed response. I will look for the other post you reference. I ended up putting a SPAX7 in V1 of a Lonestar Special to diagnose a problem I was having with my drive channel - the local Guitar center was out of 12AX7s and the SPAX7 was all they had on hand. This...

I finally got a chance today to try some tube swapping. I popped out the 12AX7 that was in V1 and put in a new SPAX7 ("a high grade subsitute for the 12AX7" - my local guitar center was out of Mesa-Boogie 12AX7s). Problem gone! No funky static noises on ch 2 drive, and no more reverb...

Mesa/Boogie has recently put a new Tube-Guide on their web site: http://www.mesaboogie.com/Product_Info/TubeReference/TubeRefGuide-06.pdf This document talks about the SPAX7A's as a 'premium' tube: Our SPAX7 preamp tubes are a premium grade substitute for any 12AX7 positions - They are a...

Ducky, You raise a good point. I was looking through the manual this morning, and I came to the same conclusion. I went back and tried to see if it would happen with the drive switched off and I was not able to detect a problem. I typically use ch 2 with the drive, but as I was debugging...

Good Suggestion - thanks. Anythoughts as to why the reverb might be randomly dropping out? I can understand the idea that a preamp tube could be messing with a single channel, ut its unclear to my why this would cause the reverb to drop out. Then again.... there's a LOT about tube amps that is...

Hi Folks, Looking for a little help. Just got a new LSS - about 1 week old and I have been lvoing it. Clean on Ch 1 blows me away, and the reverb is about the best I have heard. Everything seems just fine on ch 1. But - a problem has cropped up on ch 2. On certain notes I have...