The last week, after he too sat on my DT-25 for 2 months, the tech calls to tell me it is done. His opinion and experience with Yamaha was the polar opposite of what the first tech told me. OMG, do these things sound great !! Easily the best sounding amp I own !! I just don't really know if I can count it though. I have owned it 3 years and between normal things like replacing the tubes twice, waiting on parts or waiting to go in for service it has spent a easy 11 months down. Let's hope all my bad luck with Line 6 is out the way. Wish me luck !!
Good luck! I hear ya, it's frustrating waiting on repair shops. I took mine to an authorized L6 service center, and paid them to rebias and put JJ's tubes in it, but then shortly after found out the DT amps all require Electro Harmonix tubes ONLY, and so I am going to be taking the DT25's back less than two weeks after I just got them done, to get EH tubes in and rebias.
Apparently, the primary issues, are when an amp tech uses non EH tubes, and uses the EH bias spec, it can cause problems. The bias spec is for a matched pair of EH tubes; and that spec is not compatible with other tube brands.
For what it's worth, here are some specific comments, including the contact info of the Line6 amp tech - connect your amp tech with this guy if your amp repair shop has any questions / is confused... RIght now, I am in the hole for an extra set of tubes for two DT25's (basically $100) plus the cost of redoing the amps - they are going to cut me some slack on the price, but it will still amount to at least a $100 mis step on my part... I will be able to get the $ back from thetubestore.com for the JJ's, they are being really cool as well.
Don't assume that because a shop is an authorized L6 service center, they will stop you from doing the wrong thing - I told them to use JJ's tubes, so they did! Would have been nice if Line6 had been more direct in explaining that their authorized service centers should only use EH brand tubes when doing DT retubes, but, like most things in life, we learn the hard way.
Here are some thread links, look for all the comments made by 'psarkissian':
Repair Technician, Repair Dept
Line 6, Inc.
26664 Agoura Rd
Calabasas, CA 91302
Read this before you change the tubes in your DT amplifiers!
The key points:
· For DT50 amps: use matched pair of Electro Harmonix EL34 power amp tubes with a pair of Electro Harmonix 12AX7 tubes.
· For DT25 amps: use matched pair of Electro Harmonix EL84 power amp tubes with a single Electro Harmonix 12AX7 tube.
Use ONLY Electro Harmonix brand tubes in your DT amplifiers!
· JJ's have a tendency to damage certain parts of the processor board
· Mesa's tend to "red plate"
· Groove tubes tend to do a host of other damages
Because of the way Bogner designs the tube portions of these amps, and that this is a hybrid and not the usual bill-of-fare tube amp, you should re-tube using the specified EH from Electro-Harmonix tubes. You can't use the EH bias spec on other tubes. The spec is dialed in for the EH's. All too often these come across our bench for no other reason than having non-specified tube inside (JJ's, Mesa, Groove Tube), using the specified bias. That does not work.