post #151 of 371
4/20/07 at 3:26am
I have not experienced any ringing from normal bumps and jiggles in normal use other than when I set it down on a hard surface like a table. In other words, normal portable usage does not result in any ringing. I used the Millet portable on my ride into work today on the BART train into San Francisco. No instance of ringing whatsoever. It is a great sound amp. By the far, the best sounding portable amp that I have listened to (includes Hornet, PINT, PPAS, SuperMini IV, and Headphonia).
The portable Millett hybrid I designed is a bit different than the original, as it uses submini battery tubes and a different output buffer... but it shares the same basic architecture, and hey, "Millett" designed it, so I kept the name
(Actually I think the portable sounds better then the original.) [emphasis added]
|I could be wrong after all its just a guess here...
tubes are microphonic..bump a tube and you will hear a ping/dong/etc then goes away..I would not recommend you doing that hard or often..
|microphonics, don't buy a tube amp if you expect to bang it around (exercise/jogging)|
|I agree. It is just a fact of life most of the time with tubes. They are in a vacuum and will let you know when they are unhappy and bumping is not enjoyed.|
The TTVJ Portable Millett Hybrid headphone amp is the first of it's kind - a battery-powered tube headphone amplifier, small enough to fit in your pocket!
That sound is the tubes singing for you
The mini tubes used are a bit microphonic. Unlike bigger tubes, the elements are so small that they can resonate at a fairly high-pitched audio frequency.
Not much can be done about that, unfortunately. I've found it usually takes a sharp rap to set them going.
Originally Posted by mrarroyo
Hi, today I received my amp from Todd. It is burning in as we speak.
However, I have noticed that if I bump the amp or the table top it is resting on I hear a high pitch sound. After a couple of seconds it goes away. Wonder what this could be? Has anyone else reported this high pitch noise?
BTW my source is an iModded iPod, the IC is a mini to mini made by Fitz (silver plated copper with nickle plated mini 1/8"), and my cans are 2005 Beyer DT990 (250 ohm). I should also say I have tried other ICs and other cans and the noise is repeatable.
|I *think* these are "hearing aid" tubes rather than car radio tubes in the full-sized MH.|
Thought some pictures would be in order, Make sure you click on the thumbnail to view the full picture.
Out of the box, w/o any burn in the amp is very mellow, and dark. The bass is very nice and as well defined as the Hornet "M" against which I did a quick comparison with. At this time the Hornet "M" extends more into the treble, only time will tell if the TTVJ-Millet will sound as good or not. The soundstage is wider on the TTVJ-Millet.
At a current price of 459US my expectations would be that the case face plates be a better fit - that it be flush to the case. Please excuse the criticism if the camera shot is somehow lying. The switch and control knob should not protrude out as far. Flush or recessed mounting would prevent accidental switching, if and only if there is room inside.
If these cosmetic issues are resolved and the ringing upon light tapping is fixed I too will venture into what may be a true wonder for the portable community.