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Do you have the loop active or on bypass? And are any cables plugged into the loop jacks? Check out the thread in my post titled Lonestar Problem - no output. The problem you mention could be a bad preamp tube, but it may just be a dirty return jack for the loop.

Just wondering, for those who have multiple guitars, which guitar is your favorite to play through your Lonestar. My personal favorite is my 1978 Gibson Les Paul Custom. The tone of this guitar through the amp is so sweet I almost can't stop playing. I also have a Gibson ES-137, a PRS...

Mystery solved, thanks to Rich in Mesa's repair department. I described the problem to him and he suggested it was a dirty return jack for the loop and all I needed to do was insert a cord in and out of the jack several times fast to clean the connection. I was skeptical of this actually...

Definitely.....the Fender cleans live in the Lonestar's 6L6 tubes and circuitry. It's WAY more versatile than a twin too.

Well, I have an update to this situation. The problem reared its ugly head again after retubing the whole amp, including all preamp tubes. When the loop is activated, after playing maybe 10 minutes or so the amp loses output unexpectedly. Flipping the hard bypass switch to bypass allows...

Different tubes definitely make a difference. I just put some JJ ECC803s's in my TSL122 preamp and they really improved the overall tone. Also, I swapped the 6L6's in my Lonestar for a set of EL34's and there was a huge difference in the sound. One thing to try that won't cost anything is...

Dennis, you're a genius dude. It worked immediately with the hard bypass on, which told me it was the V3 preamp tube (that means Platypus was correct as well) that powers the loop. I replaced that tube and the amp is working fine!! And I must say that I like the sound from the groove tube...

Thanks for the input guys....I'm going to try the hard bypass solution first (since it's quick and easy), and then move on to checking the V5 preamp tube if bypassing the effects loop doesn't work. I'll post and let y'all know what happens... Ken

Another thought....if it were really the rectifier tube, wouldn't the problem go away when I switched the rectifier tracking to diodes? I tried this and it didn't fix the problem. Now I'm thinking it must be the preamp driver tube....

After reading the manual, I'm thinking this problem might be due to a bad preamp drive tube, since the problem manifests itself in all channels. Has anyone else experienced a similar problem that was caused by the preamp drive tube?

I recently bought a used Lonestar in mint condition that was on consignment at Atlanta Discount Music. It played fine in the store, but after a few days residing in my studio it started losing output intermittently...and now I can't get any output from it other than some low volume from the...