Pricklely Peete
Franken modder
- Joined
- Feb 17, 2008
- Posts
- 4,188
- Likes
- 28
Quote:
Could be a bad power tube. Is the hiss and splutter only on one channel ? I went through something similar way back when I first bought my MK III. It turned out to be a bad power tube. The amp should be dead quiet (unless the recording is noisy) at gain +10 with 650's. Swap the power tubes around...if the noise follows the swapped tube (from left to right channel or vice versa) the tube is toast. Another possibility is heavily oxidized pins on the tubes...that shouldn't produce the splutter though..
Make sure your feeding the MK III with a line level signal...if you overload the input you'll get all kinds of nasties reamplified making hiss and splutter extremely loud.
I think that covers it other than cable issues...
Peete.
Originally Posted by shadowmoses /img/forum/go_quote.gif When i switched the gain of the Mk III from +4 to +10 after i got a pair of HD650s, i found the amp to exhibit a lot more hiss and splutter, which of course is unacceptable. i reduced the gain to +5 and things were better. Any idea why this is so? |
Could be a bad power tube. Is the hiss and splutter only on one channel ? I went through something similar way back when I first bought my MK III. It turned out to be a bad power tube. The amp should be dead quiet (unless the recording is noisy) at gain +10 with 650's. Swap the power tubes around...if the noise follows the swapped tube (from left to right channel or vice versa) the tube is toast. Another possibility is heavily oxidized pins on the tubes...that shouldn't produce the splutter though..
Make sure your feeding the MK III with a line level signal...if you overload the input you'll get all kinds of nasties reamplified making hiss and splutter extremely loud.
I think that covers it other than cable issues...
Peete.