This thread is for those who prefer to use their Bifrost Multibit in NOS mode. I'd enjoy hearing about the experiences that led to your decision. Reminder: Bifrost 1 (not BF2) is digital filterless (and non-oversampling) when fed 176.4kHz and 192kHz input sample rates. To avoid potential...

I've been curious about analyzing my headphone amps for linearity. This is a good way to begin to understand a large part of the reason why some amps sound better to us than others.   To those who have done this, what is needed besides spectrum analyzer software? In particular, we need a...

I received a DV336 from a fellow head-fier last week, FedEx dropped the box (which broke a 6AS7), and the right channel is now dead except for buzzing.   I took voltage readings. I'm hoping that one of you tube amp DIYers with more experience than me can give me a few ideas as to the source...

I've begun to try to better understand the circuits in my amps. I've had success with the MG Head. It's got two plate-follower stages that look much like those you'll find described at the various tube info sites on the web. But the Darkvoice 332 is not so easy to figure out. I'm working now on...

Fitz's posts on modding the Darkvoice 336 are well worth a read. I'm curious if anyone has modded the DV332.   In particular, I'm curious whether anyone has determined what's going on with global negative feedback in the DV332. The lack of a very great difference in sound when tuberolling as...

I've been a Head-Fi member for six years, and over that time I've had the chance to listen to a number of different tube-based headphone amplifiers. The journey of listening, doing research to learn about different amp topologies, and comparing my findings with others has been rewarding, but...

Who among you, Head-fiers, has owned both these amps and is willing to offer a comparison of sound signature? I love my MG Head in OTL mode - that midrange magic is what it's all about, as far as I'm concerned. How, though, does the Woo 3 stack up, comparatively, in the midrange magic...

My excellent MG Head Mark II, which I bought used and have had now for four years, has developed a crackling and intermittent volume drop in the left channel. I've scoured the forums and elsewhere, and have learned of the following possible causes: (1) bad tube, (2) corrosion on tube pins, (3)...

My excellent MG Head Mark II, which I bought used and have had now for four years, has developed a crackling and intermittent volume drop in the left channel. I've scoured the forums and elsewhere, and have learned of the following possible causes: (1) bad tube, (2) corrosion on tube pins, (3)...

So I've recently acquire an MHDT Labs Constantine DAC, which sounds amazing when connected via coaxial to the digital output of my Denon DCD-1560 (and then to my ASL MG Head OTL). But there's a serious problem: it sounds very poor when connected to my powerbook, whether via USB or Airport...

There has been controversy about how well the following amps mate with low impedance cans (e.g. grados): Woo Audio1 and 3 ASL MG Head OTL Marks 1-3 Some say that, despite builder claims, neither of these amps is a good match for low imp cans. Many of these persons seem, however, to be...