Thanks for the suggestions all.   The RE-400/600 appear to be externally identical, anyone confirm this?   From pictures, the CK10 looked like a serious contender.  However, it is also discontinued.           Do you have both the UE700 and Carbo Tenore?  From pics, the carbo looks...

Hi all, been out of the scene for quite some time but I still see some familiar names...    Anyway, my tiny and long loved Ety er6i has finally passed on.  The sound quality wasn't fantastic, but they were the ONLY iem that I could get inside my motorcycle helmet's tight neck seal area without...

On #1 - We really aren't concerned with maximum power transfer from the source to the amplifier. What we want is for the impedance to be relatively high so loading of the output circuitry of the source doesn't alter the voltage of the signal, because the signal is all we really care about. On...

That is too slick. Looks like you left a little metal bridge to the center of the headphone logo, I was curious how you would handle that. Even though it's "just a cmoy", this is one of the coolest projects I've seen here.

I truly enjoy my k701s with the MH using 12FM6 tubes. I've not had the pleasure of Senn 600s through it though.

Get more than 2 tubes, there may be varyances between the tubes and there is the possibility that one of the tubes may be DOA.

I'm not sure about the finish on AT gear as I have never seen it in anything other than pictures. In this one: It looks more of a satin/semi-gloss than a glossy mirror finish. I've had very good results with minwax wipe-on-poly in semi-gloss. It is VERY thin, compared to most oil based...

I had a samsung, though I can't remember the model, before I got my Iaudio5 which is the same thing as the U2, only the U2 has a built in rechargeable battery and the I5 takes AAA. Out of those two, the sound quality was nicer on the Iaudio. My Iaudio has recently developed a problem where it...

Thanks for the replies everybody. I was hoping it would be more clear cut, but somehow I knew it would end up a near tie in the poll. Everyone has thier favorite players of course. Cowon is still in the running, though I was looking at the U3 which uses a new output stage at 60mw vs 26mw on...

Based on headphone out sound quality, help me decide between these following. I guess I'm still open to suggestions as well, with the following constraints - Under $100 Good Headphone out Small Light Weight I'll be using it for running, seeing as how me Iaudio5 just developed the fatal...

And more than the 250 you get from paralleling (stacking) widband buf634s isn't? This is head-fi , most of what we do doesn't seem necessary and power inefficiency is the name of the game. I have some lmh6321s, but the pimeta is currently in pieces while the case gets a refinish. Someone...

Sorry to threadjack, but I WANT that wood. Quilted maple? Lemme know, I'm curious.

Yes, an AD843 will work in place of an OPA627. Edit for luvdunhill - About the DC offset: small differences like this can be attributed to manufacturing tolerances. The difference you have described is very small and will not effect the operation of your amplifier. Some opamps such as the...

Overall, the alien isn't that hard of a build. There is one point of contention though - the PCM2702. I don't know how hard they are to overheat, but @ 9.66/each I wouldn't exactly call them cheap. Not to mention they are not the ideal beginner soldering project. Unfortunately, I don't really...

I managed to cram a 1/2 tread (no bridge), on 7/8x7/8 of protoboard. You can make some of the nodes smaller by cramming 2 leads through the same hole. Of course the leads have to be small enough, no way can I cram 2 1N400x leads or leads from a to-220 with anything else.

The TI website show the Vs(Min) for an opa2107 as 9V. Will it run a little lower? Probably. To roughly figure out where your minimum acceptable voltage is, measure the voltage, with the amplifier turned on, at the battery terminals when the 9v is almost dead. NiMH batteries are 1.2v per cell...

I'm not sure Andrea, I have never even tried what MisterX suggests, my DIP-8 opamp of choice is the AD843. From the simplified schematic it appears he is using the internally "class-a" biased front half of the 744 chip and not using the output transistor stage of the chip. I'll have to get some...

The size techflex you buy is dependent on the size of the wire/insulation and any heat shrink tube you put over it. You may want to read through whole sticky thread near the top called "How to make an interconnect Step-by-Step with pics"

I also got rid of my BUF634s though I didn't use the HA500X series. The National LMH6321 is currently my prefered IC buffer solution and is pin compatible with the BUF634. Just cut off or lift pin 1. I believe this is connected to V- through the BW resistor the PIMETA board, but you want this...

Quote: There are a plethora of amazing dual opamps and bipolar opamps that I believe can be used with the PPAS that can't be used on the ppav1 and v2. Oh, but as far as opamps go, my absolute favorite, the AD843 is not really a feasable choice with the PPAS. Now that I am back from my...

Those are the same brand that we have at work and I coincidentally use at home... Yea, they are pretty much Energizer alkalines in different packaging. They come in little cardboard boxes instead of the plastic packages the commercial version comes in. If I have to buy batteries, Rayovac...

Haoleb - what do you use to mill out the cavity in the block of wood? Nice looking, BTW.

andrea, did you manage to get your hands on one of these opamps yet? I just sent an order off to digikey for a couple ad8033/8034 opamps. I plan to use them in a PPAS driving LMH6321 buffers. If you are curious, I'll let you know how they sound when the amp is built. Got a couple more to try...

Quote: Originally Posted by Heady Taking impression of the ear can be risky if the material gets in deep and breaks during removal. Dental silicone material used for impression is very fluid when mixed but hardens very fast, in less than 5 mins and will be resistant to tearing...

Quote: There's no reason it wouldn't work. They are the same pins, and the same device. The NR pin does not need to be connected to anything for it to work. I was only relaying someone elses experience and figured I would pass on the caution. I haven't had to do this.