Posted 25 November 2013 - 07:52 AM
Posted 25 November 2013 - 08:00 AM
Hmm... My DT-25 is pretty much dead quiet - much quieter than any of my other tube amps, I believe. I imagine that hiss could be a sign of tube going bad. Has this just developed recently, or has it always been this way?
"It is not our duty to understand the arbitrary, meaningless dictates of machines"
- Don Norman in The Design of Everyday Things
Posted 25 November 2013 - 09:36 AM
I have the same hiss from the day that I bought it (about 8 months ago). I plugged it into different outlets, to no avail. I really only hear it when I'm by myself. With the band, there is usually so much other noise.
I've learned to live with it, but it is definitely much louder that a Twin Reverb.
Posted 06 December 2013 - 04:03 PM
I have a similar issue with my DT50, a fairly noticeable hum/hiss with master volume turned all the way down. It's not a performance issue as live things are loud enough to mask it, though low volume practice and studio use is a little rough with it. Will get it looked at sometime soon by a tech I trust and let you know what we find!
Posted 19 December 2013 - 06:33 PM
I have this hiss (white noise?) the OP has but in a DT50 and am prepared to replace the tubes, but I've been using it and it sounds ok. This has been there since it arrived by UPS about 1 month ago. At first I thought it was normal and it might be to a certain extent (tube amps nature etc., lol).) Also when I first fired it up and first turn the standby on within a few minutes I heard a fizzy noise that lasted a few seconds and slowly fizzed out and said to myself "WTF was that, lol". Had a few more fizzes since but just kept playing since that's what I have it for.
Which tubes did you use geppert?
I had similar problems when I first got the DT25 … changed power tubes, re-biased, 80+% better for sure.
Posted 21 December 2013 - 07:55 AM
Is there any other differences when replacing the tubes?
Is replacing and rebiasing a simple task, or will I be fiddling around in very cramped and uncomfortable places?
I don't think it's too hard but I do have experience building, repairing, fabricateing, and manufacturing many types of products. I think anyone who has the determination to learn can get the right tools and do it with confidence. Take your time and read alot, ask questions and learn as much as you can so you can be confident in yourself.
There are other threads and this might be one of the first. >>> Biasing Thread by whiteop