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The Next Batch: EC/SS - (Eventual Impressions)

post #1 of 127
Thread Starter 
Well folks, per the other ECSS thread, the next 20 amps are being built and set to ship via Todd at the end of the month. I figured I'd set up a dedicated thread to discuss during the wait (for those of us who ordered) and eventually post impressions.

I'm pretty excited about this. It'll be my first Eddie Current amp (First design by Craig, more specifically) and I can't help but feel giddy that the man behind the Moth is soon going to be rocking my K701s and RS-1s in a few weeks.

So, for those interested and especially those who've managed to get in on this batch of 20, feel free to speculate, wish, hope, pray, whatever. If early accounts are accurate, we'll have a headful of warm, detailed bliss very soon.
post #2 of 127
I was one of the first five to get in on the original batch. However, this new batch appears to be a step ahead with a whole different look and circuit board upgrade based on a new opamp. I would love the opportunity to hear one of the new ones, and maybe I could send mine their way as well for a period of time, so we could A/B in the comfort of our own home.
post #3 of 127
Quote:
Originally Posted by recstar24 View Post
I was one of the first five to get in on the original batch. However, this new batch appears to be a step ahead with a whole different look and circuit board upgrade based on a new opamp. I would love the opportunity to hear one of the new ones, and maybe I could send mine their way as well for a period of time, so we could A/B in the comfort of our own home.
Ditto. I'm another one of the first version owners, and am very curious to hear what the new model sounds like. Will anyone be bringing one to the upcoming Milwaukee meet? I'll bring mine for comparo purposes.

A_Sr.
post #4 of 127
Thread Starter 
Yea, I knew about the opamp differences, but I found the aesthetic design differences curious. I've had one of the pics from the early thread on my desktop for a while (what a tease) but when I placed my order through Todd, I noticed the case looks different. Blue, even!

Pretty nice, actually. Though, if the screws are silver as the picture suggests, I might replace them with brass screws. I like the contrast.

Sonically, I wonder too just how much of a difference there is between the two.
post #5 of 127
Quote:
Originally Posted by GlendaleViper View Post
Yea, I knew about the opamp differences, but I found the aesthetic design differences curious. I've had one of the pics from the early thread on my desktop for a while (what a tease) but when I placed my order through Todd, I noticed the case looks different. Blue, even!

Pretty nice, actually. Though, if the screws are silver as the picture suggests, I might replace them with brass screws. I like the contrast.

Sonically, I wonder too just how much of a difference there is between the two.
I believe it is more akin to the Zana Deux look. Craig mentioned he wanted his line to look more inline. So the font of the logo on top, the dual color between the front plate and top and bottom plates is meant to emulate the look of the zana
post #6 of 127

Stand by...

I am waiting on mine as well from Todd as well as a pair of RS-1s...will be my first pair of Grados and my first Eddie Current amp. I have been waiting since February but the latest word from Todd is that they may be in this week, or atleast by the end of the month. I will be in the US for a bit and I am going to call him when I hit the ground to see if I can get them while I am home!!! So, I am hoping that I have a nice warm set up and then my current set up for a good range of listening. I picked up some of the DT 880s off of Todd's B stock so I should have a bit of fun waiting. Nothing but time over here in the Stan so lots of time for listening. I really am trying to be patient here...ha ha.
post #7 of 127
Thread Starter 
Confirmed with Todd this afternoon that the amps are still scheduled to come in (and ship out) sometime next week!

Booyah.

GV
post #8 of 127

On the way...

Well, I am back in the States for a spell and talked to Todd today. He said that the latest word was that they were going to ship to him today. It seems that he has gotten this word before but it sounds like they are on the way. Grado was having some problems getting in wood for their RS-1s, etc but they are in the works as well. I am looking forward to hearing the synergy between the EC/SS and the RS-1s but for the time being I have my Senns and a new pair of DT880s. So, once I get back to the Stan I will have some time to sit down and get some good listening time in. It will be good to get my hands on this little amp...sounds like there have been some big changes with the opamp and if it is better than the original with all the praise that it received it should be quite the package.
post #9 of 127
If I order now from TTVJ, then it won't be part of the the first "batch" of 20, and the wait time will be long, correct?

Very interested to hear impressions of the new version.
post #10 of 127
A few days ago, I asked Craig “What's the difference that makes the new EC/SS that much better than the first production run?” I thought his reply would be of interest to the Head-Fi community and particular those interested in this thread.

Quote:
Originally Posted by Craig's reply
Generally speaking I view opamps as a necessary evil. The first EC/SS as heard at your mini meet used the AD797. That is a decent sounding amplifier, but many, myself included thought it had a slight edgy sound. The amp was good, but it did play a little flat, and solid-state.

There are so many different opamp architectures you could drive yourself nuts playing with them. The other factor I use them in an active circuit with closed loop gain, so my circuit will effect how the opamp sounds as well. After trying a dozen or so opamps from different manufactures in my circuit I found one interesting constant. The speed of the device effects the sound. Example, the AD797 has a slew rate of 20 volts per micro second. This is how fast the amplifier can go at rest, or zero signal to some output voltage level. For comparison sake all opamps have a speed rating given in volts per micro second.

So the next amp that sounded slightly smoother and more musical was the AD825. I thought it might have been because it used JFETS for the input, but it's slew rate was 140. After some reading many high end guys were using the AD847. They even referred to it's sound as buttery. Again a quick check of the opamps speed, 300. OK now it is getting interesting, why would a faster amp sound smoother and more natural. My best guess the amplifier has to be simpler, and have better devices to reach those speeds, which translate into less artifacts, as heard with the AD797.

The top of the heap is the AD811 video amplifier. It has a slew rate of 2500 volts per micro second. It was not stable in the original EC/SS, so I never got to hear it. The newer board is a different layout, improved ground plane, adds a DC servo, and is perfectly happy running the AD811. Now this is a completely different sound.

Remember the Grado RS-1's are specified for 100 mW of power, that is .1 watt. The EC/SS will put 3 watts into the Grado's so great care needs to be taken not to cause ear damage. The bandwidth is limited by the output transistors to 250 kHz. This is about 4 octaves above what a human can hear, and two octaves above the beginning of the ultrasonic frequencies. Because the amplifier does not use coupling caps the low frequency pole is around a half a Hertz. The Grado's are a difficult load for most headphone amps because of two resonant peaks. One in the low end and one in the high end. So an amp with a high source resistance will make the grados sound bass heavy, with bloom, and slightly edgy on the high frequencies. The source out on the EC/SS is so low it absolutely controls the Grado's and they are ruler flat over their operating range which is roughly 20 to 20 kHz. I think there is a real synergy now between the Grado's and the EC/SS, and it will make believers out of listeners who have passed on those cans because of aforementioned reasons.
post #11 of 127
Quote:
Originally Posted by dizzyorange View Post
If I order now from TTVJ, then it won't be part of the the first "batch" of 20, and the wait time will be long, correct?

Very interested to hear impressions of the new version.
I'm curious to know this as well as I may be interested in trying the EC/SS with my PS1's. Figure someone here might know because Todd is usually too busy to reply to emails and we probably can't call him until Monday morning.
post #12 of 127
Thread Starter 
Check your TTVJ accounts, folks. The ECSS has landed, and they are in the mail and on the way! What a piece of news going into the weekend!
post #13 of 127
Can't wait to see impressions from you guys
post #14 of 127
Quote:
Originally Posted by GlendaleViper View Post
Check your TTVJ accounts, folks. The ECSS has landed, and they are in the mail and on the way! What a piece of news going into the weekend!
Excellent news for all of you folks who have been waiting. If it truly sounds better than the original, you are all in for one heck of a treat! Enjoy!

A_Sr.
post #15 of 127
Quote:
Originally Posted by Absorbine_Sr View Post
Excellent news for all of you folks who have been waiting. If it truly sounds better than the original, you are all in for one heck of a treat! Enjoy!

A_Sr.
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