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psarkissian

Service Engineer Moderator
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Everything posted by psarkissian

  1. psarkissian
    The electronics have been eliminated as a source, because the electronics have been replaced, therefore something mechanical is left as the source. In the mechanical aspects,... Could be the strings, if the butt end is not snug in, or not tight at the tuning post, breaking angle of the string from the nut to the post, the nut slots, fret buzz,... any mechanical buzz will come out of the electronics as distortion (amplitude or frequency). Pick-up height not set correctly, induces warbling, which induces a host of other related audio artifacts into the final signal.
  2. psarkissian
    You'd think after being a Mahavishnu Orch fan for four decades that I wouldn't miss that one,... thanks. Master volume, maybe just a smidge. Your settings seem fine. Class-A Triode would run hotter than a Class-B Triode. And a Class-B Pentode runs even more efficient. If you gig regularly, the 12-18 months interval would be about right for you (unless one goes prematurely). And the power tubes have to be a matched pair.
  3. psarkissian
    Usage will determine how long the tubes last. Gigging musicians should change them out every 12-18 months, bedroom, living room and weekend rock stars ought to change them out every 20-24 months. Over-biasing for more crunch, shortens the tube life. Making like John McGlaughlin or Al DiMeola is better for tubes than playing like a dark master shredder king with the amp turned up to eleven. I've seen fresh tubes (at other places I've worked) last two weeks in an amp, or as long as five years (in that same amp).
  4. psarkissian
    E6 input needs to go to the E6 piezo or strings 5 and 6 won't process correctly. Putting E6 piezo in A5's input only masks the problem,... it doesn't solve it. But other audio artifacts may show up when you do that. That's why it only appears to work. I can't go into the processor aspects of it. And BTW,... from what I've heard in the audio clips, your playing is fine.
  5. psarkissian
    As I've said before,... mechanical, so it's more than likely the set-up needs adjusting somewhere. And yes, the guitar is made of wood, the hardware is made of metal, so a lot things resonate. So it all gets checked and if needed, adjusted. One thing I adjust when playing my JTV's, is my technique. Knowing how sensitive this stuff is, I make certain adjustments as to how I play the thing. To paraphrase Shakespeare,... to play is the thing, so I play the JTV thing. Tomorrow, it might be my Gibson.
  6. psarkissian
    Depends on the smell. Whether it smelled like plastic, glass or metal. The bias specs for the EH's has already been worked out in the designed and test process, so it's a fixed spec. As far as biasing JJ's, we have no spec for that. I would have to O-scope it with a signal and dial it in to find where the bias point for the JJ's are. Rheinhold's tube amp circuitry is not forgiving of deviations from the spec, and matching our processing to it makes it even more hybrid and even less forgiving of mods or deviations from the spec. This isn't a tube amp from the 60's or 70's,... can't get away with the same kinds of tube swapping we used to do back then. Use the specified EH's,... it's the best bet.
  7. psarkissian
    Phantom power is to be engaged when using condenser mics only. Do not engage phantom power when using dynamic or moving coil mics or it will damage the phantom power circuit.
  8. psarkissian
    There is no memory battery in the unit. Authorized service center. They can fix the freeze-up issue and check for any updates to be done to hardware and firmware.
  9. psarkissian
    900 is good for stereo systems. Sensitivity and power transfer of the 900 make it the wrong kind of speaker to use. The "sensitivity" or "efficiency" is usually measured in dB's. High effeiciency stereo speakers like the 900, or even the JBL 4300, 4400 series and 803 Time Aligned studio monitors are too sensitive for use as guitar or sound reinforcement. Celestions are typically used for guitar and sound reinforcement. The surround material in the JBL 900's, 4300, 4400 series and 803 Time Aligned studio monitors would tear too easily if used as guitar speakers. Most guitar (and bass) speakers use more hardy material that is strong and yet flexible enough to maintain good speaker cone excursions, and not tear the surrounds in the process. Speakers these days, in general, are made to be optimal for their specified applications and uses. There are a few that have multiple applications.
  10. psarkissian
    Don't do it, they are not designed for that kind of use, they're made for high fidelity stereo, not high power guitar stuff. I used to sell and service JBL speakers and other of their products, I even worked there a while. I know their stuff. Don't use them with a DT series amp. They aren't made for that. If you buy them, use them for something else. If you plug them into the DT and at some point the speakers blow, it will take the amp down with it,.... and that will cost several times more than $100.
  11. psarkissian
    Noise floor. Ground loops are possible,... depending on what else is in the signal path and how it's plugged in,
  12. psarkissian
    They relays inside are Model or TRS, not both. And if you could split it you would have the effects that Steve mentions, and circuit load issues relating to amplitudes. The circuitry isn't designed for loading down like that.
  13. psarkissian
    Can't bias the JJ's to the same bias voltages. The transfer function curve and multiple topology gain structure of DT series amps is not good for JJ's, Mesa's and Groove tubes. I see too many DT series amps come across my bench because of other tubes being put in the amp and biased to the same bias volts as if they were EH tubes. These are not tube amps of the 1960's and '70's, you can't get away with the same kind of tube swapping like we used to do back then. These are hybrid amps with analog and digital stages, both solid state and tube. Can't get away with the same sort of things like we did back then. Please,... use the specified EH series. They've gone through a further sorting through.
  14. psarkissian
    Depending on how much you play and how hard you drive the amp,... ... tubes should be swapped out every 12-18 months if you're a gigging musician, if you're living room rock star who plays at home on the weekends, then every 20-24 months should suffice. I've seen new tubes last two weeks, I've seen new tubes last 5-years. No matter how well the tubes are scrutinized and checked at the factory, there is always the element of chance. It's like that with all electronics. If it's been a year and you're a gigging musician, then it's probably time to change the tubes out. Use the specified tubes, matched pair power tubes. Sorry, but I'm going to say it, take it to Line 6 authorized tech to check and make sure that if the tubes did go down, that it didn't take anything else down with it. Basic good idea for any piece of electronics gear, tube or solid state.
  15. psarkissian
    What tubes are they? Brand, type, and all.
  16. psarkissian
    Yes, Mogami is good too.
  17. psarkissian
    Don't use 50-Ohm mic cable, that's the wrong stuff to use. Line 6 Link cable is optimal, or the Hosa EBU-010 AES/EBU Digital Audio Cable will do. Both hold to the 110-Ohm, AES/EBU Standard for that kind of cable.
  18. psarkissian
    Was there an interruption during an update? Try re-Flashing it. If that doesn't work, log a ticket in the ticketing system to get a return authorization to get it serviced.
  19. psarkissian
    I would suspect,... ... that there are a number of other repairs in the line. Don't know where in the line yours was. It shouldn't take that long, but sometimes it does. Rare, but it happens. They probably gave yours some extra looking over and extra testing as well. That might take a while longer than usual as a result. And since they replace some electronics, depending on where the parts shipped from, that would also add to the time.
  20. psarkissian
    Had one in for service once. Wasn't too bad, but had a smidgen of stuff on a set of coat 11-48 gauge set. Come off without any problems. Still, something to be aware of. Rare,... very rare.
  21. psarkissian
    XL110 by D'Addario are the factory strings 10-46 gauge. If you decide to change string gauges, by sure you get the set-up adjusted for the change in string tension. Those coated type of strings may leave coating behind in the works over time. Hasn't been a problem that much,... yet. Mostly, it's what feels good to the touch, the tone, how bendy it is for those who do bends.
  22. psarkissian
    It's fine so long as the the correct string is going down it's correct signal path. The string/piezo is matched to the correct signal path, or there will be frequency artifacts on some of the Models. To get any more particular or deeper than that, go to Julius Orion Smith III's web link at CCMRA at Stanford University. He teaches processing and Modeling. I've gone as deep into the circuit concepts as I'm allowed to. Since the bridge and electronics were replaced and the problem is still there, then something other than the bridge/piezos and electronics is involved.
  23. psarkissian
    The electronics were replaced and there is still a problem, then process of elimination points to something else non-electronic. And messing around in there without schematics and service info is not a good idea. There would be other frequency artifacts that would occur as a result of swapping wire like that. Some Model settings would be more noticeable than others.
  24. psarkissian
    Regarding sending a piezo wire to another string doesn't mean anything. Each string has it's own signal line. The processor will treat the E-string as if it were the A-string, so of that signal path won't sound right. The processor knows which string is which, it expects to have the correct string on the correct signal path line. If the bridge and its piezos are replaced and it didn't solve the problem, then the problem is not the bridge and its piezos. If the electronics were replaced and it didn't solve the problem, then the problem is not the electronics. Process of elimination. That narrows it down to something mechanical.
  25. psarkissian
    Thanks.
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