I had a 12AU7 go bad on me. What caused this tube to fail? The bad tube (on the left, of course) looks like a snow globe inside. What is the material on the inside top of the tube anyway? I am taking a guess that air intrusion was the culprit.

I purchased a Pro-Ject Debut III on Audiogon a few weeks ago. This thing is nearly pristine, but it hums like mad. It is grounded onto the amps, I changed out the cartridge, connected it to my headphone tube amp and a solid state intergrated amp, switched IC's, changed power cords, tried...

You go to a yard sale, thrift store or other favorite haunt to seek out old vinyl. You come home and furiously clean the cheapo find with an RCM or manual method of your preference. Do you test it out on your 'most excellent' turntable or do you have a sacificial turntable to test the LP before...

It used to be, twenty plus years ago, that high end sound systems had a preamp and amp before the speakers. The preamp usually had things like a source slelector, treble and bass control, perhaps volume and phono preamp, etc. Nowadays, with the introduction of digital sources, the basic sound...

I saw the Shanling PCD3000 at the Moon Audio booth at Can Jam '08. I like that it is black, it has a small footprint and would look nice with my Woo Audio WA6 SE headphone amp. I have not, though, been able to find many reviews/impressions of this player online. Does anyone own one and wish to...

Post placed in wrong forum. Sorry.

I took shipment of my new WA6 SE this afternoon. It is still in the box. I hope to touch it later on this evening!

I know there are many folks out there looking for a remote for the Cowon/iAudio X5 unit. I just spotted one on eBay this evening. For those interested...iaudio cowon x5 x5l remote control - eBay (item 260245422919 end time Jun-04-08 12:42:10 PDT).

I designed a passive audio source switcher based on the SOCRAM by mb3k Audio (www.mb3k.com) minus the crossfeed circuit and with two less outputs. I want to use a toggle to switch between the outputs from the switcher. Assuming the diagram below is readable, could someone verify that my circuit...

Seems that no one has ever posted pics of the internals of a Beresford DAC, so I opened mine today. This thread is as much about what is inside and how the unit may be modded to further improve performance. Overview View From Front View From Rear Down The Alley The DAC IC...

I do not generally start a new thread, but I thought the title would peak the interest and feedback of the Head-Fi elite. I just received my LD MKII today and started playing with it (burning it in). I ran into a possible problem when I used my iBasso D1 as a DAC feeding the output to the...

When I try to post in any of the For Sale/Trade sections of the forum, I receive the following error/explanation. "[username] you do not have permission to access this page. This could be due to one of several reasons: Your user account may not have sufficient privileges to access this...

Well, I took a stab at my first CMOY amp this weekend and was only partially successful. I surely do appreciate the technical craftsmanship and beauty of the rigs you folks build on this forum after venturing into this DIY headphone amp-building experience. Perhaps, I will grow another brain...

This is my first post on head-fi, so please excuse me if this subject has been beaten to death in the past. When wearing headphones, you essentially block out the world around you. This is good until someone or something needs your attention. What do you folks do when the telephone rings or an...