Roadster volume is fading in and out

[sarmation]

As the title says play for 5 minutes then the volume fades to almsot nothing then comes back after 15-20 seconds.Very eractic pattern.Isn't a instant drop takes one second to go down,almost like something is draining.Talk to the fellow at euro tubes he said to check v1 and v6.Butt hought I'd ask here also before I do anything.Happens when using effects in loop or on hard bypass.Also happens in recto tube mode and diode.Not sure how hot the recto tubes are supposed to run but one is sorta on the high side of warm the other barely gets above room temp.Any suggestion before I take it to a shop would be appreciated.Also power tubes all look fine to the eye.

Dave D

 

[Spewnz]

id say probably a preamp tube id go with the v-1 v-6 suggestion

 

[pokerrules47]

replace the cathode follower positions with a good chinese 12ax7. The Russian made mesa branded tubes do not do well in these positions. It's not a "bad" tube per-se, but more of a tube not matched for the position. Buy 2 (or more) chinese tubes, remove 3 and 5 and put the chinese ones in there and use the russian ones as spares.

If the drop-out happens while changing channels, try leaving the reverb foot switch on and see if it continues.

Here is a good reference http://www.richardcleaver.com/tag/mesa-boogie/

If your amp is under warranty, mesa will cover this.

Hope this helps

 

[sarmation]

No drop when changing channels.It happens on all channels ramdomly like something is slowly draining then fills with power again. Thinking about just doing a complete retube from eurotubes and try some gold pin jj's.

 

[Roadster_08]

I had this problem before with mine. As is turns out, if you have a dirty effects loop this can happen. Try cleaning the effects loop with some contact cleaner or some type electrical cleaner, also, if you're not already running anything in your effects loop, try running a short jumper cable from the send to the return. This worked for me. Hope this helps!